Home » Who is behind this project?

Who is behind this project?


This news and research blog augments the World Hum Database and Mapping Project located http://www.thehum.info

Dr. Glen MacPherson lectured for 16 years at the University of British Columbia (UBC), training mathematics teachers in the Faculty of Education, and worked for 10 years with UBC Robson Campus with its GMAT and GRE curriculum program. He is also an ethnographic researcher, and high school teacher of physics, mathematics, psychology, general science, and biology. He lives and works on the west coast of British Columbia, Canada. His books, articles, and speaking engagements focus primarily on mathematics education.

After first noticing the Hum in spring of 2012 and discovering the Hum community, he sensed the need for a unified, moderated, and serious place for discussions and research surrounding the world Hum. This led to the World Hum Map and Database Project.

The leading theory is that the world Hum is an internally generated audiological phenomenon, possibly related to otoacoustic emissions.  (Note that tinnitus is also a self-reported audio effect, although it manifests quite differently from the Hum.) There are four competing theories.

This is a place for disciplined inquiry, and not for wild speculation and conspiracy. There are many entertaining and interesting websites available for those who want to indulge in those activities.

Contact Glen at glen.macpherson@gmail.com



  1. George G. says:

    To Benoit,

    Hello again.

    You mentioned an electric field.

    “—–our body takes care of this electric field—-“.

    Please explain how you detect this field so that others may attempt to detect this “electric field”.

    Do you use an instrument of some kind?

    I eagerly await your response.

    Thank you.

    • Benoit says:

      Hello George,
      Yes I guess it’s an electric field although I have not been able to detect it with my kit MK30 GIGAHERTZ SOLUTIONS but strangely latency decreases in the rest areas when I’m barefoot on the earth.
      Since my past experiences with the RION NL-62 sonometer that goes down to 1Hz have only resulted in the discovery of beats of industrial machines, I definitely put aside the hypothesis of a sound of low frequency even if it is perceived in this way by the inner ear. Strangely in my rare rest areas there is no 4G and the antennas are far apart.

      • George G. says:

        That’s great Benoit,

        Keep the experiments going, and keep us informed on new developments.


  2. Vanda says:

    I use a child’s sleep fan which I’ve been using for six years to recreate a similar drone to the HUM with several settings. This is about the best thing I’ve tried over many years. I first “felt” the vibration and droning and HUM in Bristol in the 1980s when I was in my 20s. I now live in Oxfordshire and it is almost constant and far worse at night, destroying quality-of-life. A Osteo once asked me if I had second sight because his PhD prof had studied my skeleton type and I have a large occipital bulge. The left side of my body is slightly bigger from the chin down to the toes and it is on this side that the hum is far worse. I have a theory that we sensitives have a different brain type and possibly a larger amygdala. The BBC radio recently emitted a sound most people including the presenter heard as LAUREL; only one caller said she heard YEARLY. I was the second person who heard that. It is quite a large discrepancy. Also I’ve read up on wind turbines; underground vibrations can actually amplify over distance. Passing through underground cavernous spaces as well as overground, the (noise) frequencies must get stronger. I also live near a new American Intel base using massive telecommunications Equipment. The environmental health officer who visited told me there was nothing a council can do as they are exempt from any such investigating. The Earth Pulse I also tried as I assumed that the frequency 7.8Hz might help. But I get just as much benefit from laying out on the grass for half an hour; it feels like the battery has been charged or the body drained of what was depleting it. Since I’m hyper aware my last theory is that we have more of the Neanderthal brain, attuned to sounds at a different frequency than is the general population. A gift thousands of years ago, but an affliction today.

  3. Vanda says:

    Does anyone know anything about the oscillation rate of brain cells; is that connected to electricity (excuse the pun)?

  4. Radosław Szukiewicz says:

    It seems to me that each dot is placed conviniently close to a running water source (a river, a stream or a pond) and to a crossing of roads of primary or secondary importantce. The sound must come from Tunnel Boring Machines or other heavy equipment building undergound shelters and communication links in expectation for a coming nuclear war.

    • Of course your conclusion is false. Human beings live near water. I would ask you to list more than a tiny handful of even medium-sized cities that do not have a significant river flowing through or near them. Likewise with the correlation between population and connections to highways. This marks the end of “tunnel boring machine” discussions.

    • J.O. says:

      Well, if a nuclear war is coming anytime soon I guess we’ll soon stop thinking about the causes for the hum.

  5. Gwebo says:

    I just completed my entry in the world wide database. I am a ham operator and have equipment to see the hum. It’s operating at 59 Hz. Nearly steady with my ear but equipment showing a very slight variation in intensity. Very slight. I took a screen shot and can send showing the signal.

    • Keith Hamlyn says:

      Could you please describe your equipment? I am also a radio ham and am trying to isolate the noise and to use some form of direction finding equipment at audio frequency to search out the source, a bit like RDF.

    • Gwebo –

      Are you in the US or Canada? IF SO, there is a suspicion that you are hearing 60 Hz originating in the power equipment. How accurate is your equipment? WHAT equipment did you in fact use?

      Another indication that it is associated with power is that you describe it as essentially rock-steady. Hearers of the traditional Hum (in contrast) describe it as surging (diesel engine in distance). Also, you got some sort of display? Getting a display of AC hum is trivial. No one has ever displayed the traditional Hum.

      Since you have filled in Glen’s survey, how did you answer two of the questions: (1) Does a head-shake interrupt the hum you hear for about ½ second? and (2) Does anyone else at the same time and location hear the same thing?

      Thanks for your additional info when you get the time.

  6. Lisa M. Allen says:

    Annamae, or anyone else living in the Southern U.S. – has the hum gotten louder in the last couple of weeks? I notice that for me, in South Carolina, it’s loudest when it gets hot here and not as consistently bad other times during the year. I’d be curious to know if that’s a pattern anyone else has noticed, too.

    • George G. says:


      Are you still experimenting with that recorder you purchased not so long ago?

      If so, anything to report?



    • annamaeforever says:

      Lisa, Yes I hate to say it but it is a lot worse. Very very active and in the day too. I had to start taking sleep stuff. The banging is worse and I have 2 very loud industrial fans but the vibrations are so bad. Thinking of getting rid of my sleep number adjustable bed now. I just cannot believe that only a few of us experience this how can that be. I hope you get this post I think I did it correct. Very hot here in Orlando. Don’t think it matters anymore hot or cold day or night. Hope all ok for you.

      • Lisa M. Allen says:

        Hi Annamae, I’m sorry to hear it is so loud for you, too. I also have to take something to help me go to sleep. Do you think changing beds will help? To me it seems like it always gets worse when it’s hot and it’s very hot here now, too. But last night I didn’t hear it at all when I went to bed, though it did wake me up at 6:30 a.m. A weird thing happened yesterday and I don’t know what it means, if anything. My husband sent me a video of someone playing a Hurdy Gurdy (an ancient instrument) and it created a reverberating sound in my ear that the hum also causes, but my husband didn’t hear that, and he also doesn’t usually hear the hum. I don’t know if that means anything or not. My landline phone does the same thing sometimes and it’s so bad I have to hold the phone away from my ear or put it on speaker. None of this happened before the hum. As I sit here writing I hear the hum loudly reverberating in my ear, just like the phone does and that instrument. BTW, are you still using ear buds – does that help at all? I tried them but found it too uncomfortable to sleep with, though it did block out the hum.

      • annamaeforever says:

        Lisa, It was active last night but this morning and now is very quiet and peaceful. My friend in Massachusetts said she can feel it come up through the mattress springs and my adjustable bed has a lot of metal under it. I might try sleeping on my air mattress some time. I keep wondering WHERE it goes when it leaves here??? It is getting louder and stronger in my experience and I believe it will break through sooner or later and everyone will know it. Ear buds did nothing for vibrations. I guess just put the bandaids on and treat the symptoms as needed. Wish it would stop

      • Lisa M. Allen says:

        Annamae, yes, I wish it would stop, too. The fact that you stopped hearing the hum last year during a power outage is significant. I remember you said that when the generators started, it was hard to tell the difference between that sound and the sound of the hum. But, the hum stopped when the power went off, and until the generators started you didn’t hear anything, and that is something to take note of. There is a couple that lives in my town that heard the hum a few years ago and also experienced terrible vibrations, just like you do. They hired an industrial engineer who came and investigated and all that noise was determined to be caused by the power company. They spent thousands of dollars trying to get to the bottom of it as it was ruining their lives. They complained and made a big stink about it. It was in the newspaper too, and all of a sudden the hum stopped. Isn’t that weird? The hum may have different origins for different people, but it’s possible that for some of us, the power company could be the culprit. If you lose power again this Fall during hurricane season it will be very interesting to see if the hum goes away again. All of us who are believers need to pray that God helps us find the answer to this mystery, and I believe he will.

  7. Lisa M. Allen says:

    Hi George, yes, as a matter of fact I just finished resetting some of the specifications on the Tascam that were recommended by the person who is helping me (and very knowledgable about these sorts of things). I am going back to the substation this weekend. It is about a 10 minute walk from my house, up a dirt road away from the street. I didn’t even know it was there until recently. I went there a few weeks ago and of course it was very loud, but in addition to the higher decibel noise, there was a very loud, very low rumble, which sounded just like the hum but 1000 times louder. It had the same kind of pulsing sound that the hum has. It was very strange. I also have a screenshot from home with the Audacity app that shows a low frequency noise in the house, but I’m also going to do that again with the power off this weekend. Also, last week we had a huge storm and lost power for about 5 minutes. Of course my first thought was, “Is the hum still here?” I listened and heard nothing. But I wish the power was off a little longer to be 100% sure. If we lose power for more than a few minutes during hurricane season that will be a good test – I’m sure I’m the only one hoping for that!

    • Keith Hamlyn says:

      Could you possibly share the settings that you were given. It’s quite possible that I haven’t set mine up properly.

    • Lisa M. Allen said JUNE 22, 2018 AT 11:28 AM IN PART

      “. . . . . there was a very loud, very low rumble, which sounded just like the hum but 1000 times louder. It had the same kind of pulsing sound that the hum has. . . . . .”

      Lisa. This would seem to be a key fact. Is the loud hum from the substation 120 Hz? Forget about making any recording. Make sure you recognize this 120 Hz pitch. Use the Online Tone Generator. In fact, try (at home) to hum (sing) it which will likely not be easy (very low for a woman), but the singing effort will in consequence become a familiar (transportable) experience as a level of mild discomfort. If the substation is 120 Hz, does this follow you as you walk home?

      • Lisa M. Allen says:

        Hi Bernie, I don’t know if it’s 120 hertz. I would have to go back and see. I just recorded the 120 Hertz tone from the Online Tone Generator on my cell phone recorder so when I go back to the substation I can check. That is closest to an A sharp I think. I drive there because it’s in a wooded, secluded area away from the street. Anyway during the day and evening there is some nearby and distant traffic and so many birds singing that once I’m on the main street it’s hard to hear the substation. But if low frequency sound travels it only has to go a short distance to my house – less than a quarter mile, so it could easily reach it I would think. I’ll go back during the week and see if it sounds like 120 hertz. If it does, what does that mean?

      • Thanks Lisa –

        You indicate that you have a power substation within ¼ mile and that except that it is very loud up close, it sounded “just like” your hum at home. A 60 Hz (your power frequency) substation has a 2nd harmonic of 120 Hz, and this 120 Hz is exactly what we expect to emerge acoustically as transformers attract ferromagnetic materials (transformer cores, equipment doors, etc.) TWICE each 60 Hz cycle. For details, see:

        Click to access ENWN54.pdf

        As you note, 120 Hz is right between A# and B just two octaves above the bottom end of the piano. It is not that easy to hear as a sine wave, but much easier than 60 Hz, and comfortable as a mechanical buzz. If you can identify this buzz as 120 Hz at the station, at home, or both, you may well have your culprit.


      • J.O. says:

        Back in the 1950’s when electric guitars were first being produced, the pickups in them were called “single coils” They were basically a bar magnet wrapped with copper wire. But they did then and still do today have a problem and that was “60-cycle hum” that was transmitted into the amplifier especially when florescent lights or other electricity sources were nearby or overhead. Then an inventive young man used two magnets with the polarity of the magnets in opposite directions, wrapped them in copper wire and called them “humbuckers” and they are still called this today.
        I mention this because A) I’m a guitar geek and B) Because of this topic between Bernie & Lisa.
        Lisa, as I believe you live in Florida, would it be possible for you (or possibly other folks living near the coasts) to charter a boat to take you a few miles off of the coast where potentially all power could be shut off? (except the 12 V battery maybe). If the hum is absent away from all land-based sources of 60-cycle electricity, it could add an important observation as to the origin of the hum.

      • Replying to J.O. JUNE 26, 2018 AT 8:16 AM

        Lisa already said just above that she at least did not hear the hum when her power was off for five minutes due to a storm. Likely the storm provided the generally unavailable option of shutting down her nearby substation – not just your own home breakers. Important evidence.

        [By the way, “humbucking” (at least as a term) goes back to perhaps 1930 in connection with “electrodynamic” loudspeakers used in radios.]

      • J.O. says:

        Yes Bernie, I know she said that…I read it. But do you not think it would be a good idea for those living near the coasts and with means available to go away from land sources via a boat and see if the hum is still present? I’d be happy to volunteer for the experiment as there is a good probability of catching some fish while out there, but I’m a poor choice as I’ve not heard the hum since early May.
        And your comment about humbucking and radios gives even more credit to 60-cycle hum potentially being the culprit.

      • J.O. said “. . . But do you not think it would be a good idea. . . .”

        I do not think it would be a good idea in this case. You don’t want to get AWAY from the suspected source but CLOSER to it. She already knows how to walk up to the fence of her prime suspect.

        If you can get within 10 yards of a suspect, and hear it getting louder, you probably have your source. If you are 10 mile away from some suspect, and don’t hear any hum, you are also 10 miles away from some other substation, some factory, some municipal pump, and so on.

        And I wouldn’t bet on 60 Hz but rather on the 120 Hz “magnetostriction” noise of aging (delaminating) transformer cores. If so, that’s good as the power company may be more easily persuaded to change out to new units. They generally have a good supply of spares on hand.

  8. Lisa M. Allen says:

    Keith, I’d be happy to. To maximize the signal-to-noise ratio: WAV 24-bit, 44.1 k sampling rate, and MONO recording. Also:

    – LOWCUT OFF (white background)
    – Level Control OFF (white background)
    – Effects OFF (white background)
    – Auto Tone: OFF (white background)

    Also, maximize the recording level (see page 14 of manual). Good luck!

  9. Lisa M. Allen says:

    Hi Bernie, thanks for the feedback. The first time I went to the substation, it was very loud and there were two types of noises coming from it. One was very loud and mid range, and the other was a very low, pulsing type rumble that sounded exactly like the hum but 1000 times louder. Then I went a second time and it was relatively quiet. It was making noise but not much, and that time there was no noise that sounded like the hum. I will have to keep going back until it is loud again like the first time, and take recordings with the Tascam recorder and also screenshots with the Spectroid app on the cell phone. I’m getting the hang of all these apps and the recorder now but not being a technically oriented person it hasn’t been easy! But I’ll keep on trying.

    • Thanks Lisa –

      You also noted above that your hum is stronger when the weather is hotter. In the past, people seemed to feel that the Hum (traditional) was loudest when it was coldest outside, and this we suggesed could be possibly attributed to closed windows stopping distracting outside environmental noise.

      Since we are (for the moment) talking about power-station buzz, perhaps on hotter days in warmer climates (like yours) the higher electrical loads of air-conditioning would enhance the acoustical output. This is logical.

      Another thing to keep in mind?

  10. Lisa M. Allen says:

    J.O., that is interesting about the guitar. I live in South Carolina, about a 3 minute drive to the ocean. A year and a half ago we went on a cruise in Alaska, and when the engine was off I didn’t hear the hum (Obiously I couldn’t hear it when the engine was on either.) I just mentioned your idea to my husband and since he’d love to go fishing on a boat, he’s all for it. I’d have to see how much it costs. I can continue to go to the substation and also go out into the ocean, it doesn’t have to be one or the other. This weekend I’m going back to the substation, recording it, downloading it and having the Audacity app do a spectrum analysis. I’ll look into chartering a boat too.

  11. Lisa M. Allen says:

    Bernie, yes, I had the same thought. Plus, in the winter people don’t use their electric heat (that’s what it is here) all the time lbecause it’s not always cold enough to warrant it. Some days can be in the 50s or 60s in the winter, and other days it’s cooler, or even pretty cold. But the electricity doesn’t run as constantly as it does in the summer months, and that’s when the hum’s the loudest. Also this is tourist season in Myrtle Beach and it’s packed with people now. But why it gets louder late at night, I don’t understand. I think the power company could be the cause of Annamae’s hum, too, in Florida, since she also stopped hearing the hum when they lost power during a storm. Of course the power company won’t admit it though!

    • annamaeforever says:

      Lisa, I can’t find your other post to respond to but my friend up north has told me the same thing, that is , that she hears differently than she did before the hum. She has experienced this outside of her home doing regular things around her town like stores and other places. This is re the phone and the instrument you were talking about. I did call the power co. and they came with their big trucks and were here for hours and said everything is ok. I don’t know what to do because it always comes back to the same thing, I can hear/feel it but “they” can’t , so how in the world can I get any help? It is not their fault that they cannot hear it. There is no starting point for them. Re the couple that you mentioned, the both heard it and I guess others did too and so thats why they got help I am guessing. It always goes back to that in my view. It seems to me that it is getting stronger and more frequent and maybe it will finally break through and everyone will hear it and then it will be exposed.

      • annamaeforever says:

        Lisa sorry forgot to say that glad you are getting sleep, I know it is hard to have to take something. I never had a problem sleeping. Only on some nights when I would be concerned about a patient, or maybe a problem with family. I really don’t like the idea of it but we have to sleep so treating the symptoms is the only option.

    • Vinny Setala says:

      Dear Lisa. In my early 20’s I had an ear damaging gunshot injury, which somehow turned my hearing range as it healed to where I could hear frequencies from about 24-25 Hz to 35Khz (Dogs and Bats lol) then in the past 4 years, I’ve had three major head trauma’s. About 18 months after the 1st TBI (Two Ton Truck near head on) I began noticing the Hum at night and early morning. I live in the country in SW Washington, and though I had “noticed” this low frequency hum, it never seemed obtrusive or harmful. In fact I thought it was “low frequency tinnitus” if there is such a thing as I have tinnitus at the high end, or “just me.” Then it quickly became worse over a few months, even having apparent physical effects, which prompted me to try the internet. Holy Moly! I have been stunned at the global reporting, and the ever more serious research. Knowing that hundreds if not hundreds of thousands have and are hearing this hum, and a great many are having physical reactions like myself, at once came as a great relief and frustrating block of flat earth, tin foil hat, basement dwellers (or “agents posing as conspiracy nuts” for misinformation…lol) the usual ‘expert debunkers’ calumniate trolls…all having to be zigged, zagged, and ducked around as I kept getting more and more ill, unable to think, having a cascade of physiological systems failures and finding bits and pieces of the puzzle. At root, it still is, and I’m desperately searching for an end to this continuing mind/body/spirit decay.
      You said you were going out to use an audio-spectrometer app, or something to identify the frequencie(s) over the weekend, and I was wondering what you may have found. I have found a list from some “radionics” program that identifies known freq’s from .0001Hz – 25KHz and what, if any resulting reaction with the human body may exist. Many in the ELF and LFN range are KNOWN to have disastrous, life threatening effects, yet we still have as many theories as ever. My thinking has become more focused on, “While I get getting lies and silence from official’s as to the what, how and who’s to blame, I am very sick and getting sicker. What can I DO about it?”
      At least I know I haven’t been just losing my mind, regardless of the source it is harming me, and even if the most mundane or multiple industrial electromagnetic systems, HARRP, or atmospheric/acoustical sonic resonance, the COST o even admitting it much less abating it, ensures nothing will be done on any globally significant scale. Thus, we must find some ways of protecting ourselves. Thank you for your posts and I would be very interested to know the results of your field experiment. Thanks all…Vinny Setala

      • J.O. says:

        Vinny you said something intriguing to me…head trauma. I’ve had 3 concussions over the years. How many others here have as well?

  12. Lisa M. Allen says:

    Vinny, You expressed so well what I think so many of us are experiencing. I can’t say “all” of us because some don’t seem to be as bothered by it as others. I am trying to live as normal a life as I can, but the negative effects of having to take something to help me sleep almost every night, and having to give up reading at night because the peace and quiet I need to concentrate isn’t there, and wondering and worrying about where this noise is coming from, for months and years now, are the “new normal” for me. I know it has had a negative impact on my physical health. There is comfort in knowing we’re not alone in this, and that many are trying to figure it out, but the answers still seem so far away. One thing you said made me think of something: I first started hearing the hum shortly after I starting going to a shooting range. I wore protection for my ears but it was still extremely loud. I don’t know if that did something to my ears or not. But other “firsts” were also happening around the same time, so it’s hard to say what external factors, if any, caused my hearing to become so sensitive. On the screenshot of the Spectroid app I used at the substation, in one picture “120 Hz; -50 dB” was in the middle of the screen in blue, and on another screenshot it said “152 Hz, -55 dB.” I don’t know what that means. Someone who is knowledgable about all of this is helping me but right now we are waiting for the Tascam company to get back to us on how to calibrate the recorder I bought. I think in my case there’s a chance the culprit could be the substation, but I’m not sure. Even if it was, the power company wouldn’t do anything about it because most people don’t hear it. You are right that we have to find ways to protect ourselves because we might have to live with it for the rest of our lives. Are you able to mask the noise when you go to sleep? I hope so. Despite the negative effects of living with this, we have to try to stay strong and keep trying to figure it out. I think everyone’s clues and insights and experiments will eventually lead to answers. One day we’ll have all the pieces to this puzzle and the answer will be known; of this I have no doubt. Hopefully we’ll still be around to know the answers, too.

    • Lisa – it is interesting that your cell-phone (spectrum analysis?) app responded with 120 Hz. Here is a digest of what we discussed regarding 120 Hz:

      (1) Bernie Hutchins JUNE 24, 2018 AT 9:44 AM Lisa M. Allen said JUNE 22, 2018 AT 11:28 AM IN PART
      “. . . . . there was a very loud, very low rumble, which sounded just like the hum but 1000 times louder. It had the same kind of pulsing sound that the hum has. . . . . .”
      . . . . . . Lisa. This would seem to be a key fact. Is the loud hum from the substation 120 Hz? Forget about making any recording. Make sure you recognize this 120 Hz pitch. ?

      (2) Lisa M. Allen JUNE 24, 2018 AT 6:57 PM . . . . . I just recorded the 120 Hertz tone from the Online Tone Generator on my cell phone recorder so when I go back to the substation I can check.

      (3) Bernie Hutchins JUNE 26, 2018 AT 1:33 PM . . . . . And I wouldn’t bet on 60 Hz but rather on the 120 Hz “magnetostriction” noise of aging (delaminating) transformer cores. . . . . .

      (4) Lisa M. Allen JULY 11, 2018 AT 9:44 PM . . . . On the screenshot of the Spectroid app I used at the substation, in one picture “120 Hz; -50 dB” was in the middle of the screen in blue, and on another screenshot it said “152 Hz, -55 dB.” I don’t know what that means. Someone who is knowledgable about all of this is helping me . . . . .

      NOW: Did you HEAR the 120 Hz? Forget about trying to record. Forget about equipment. Forget about experts. Simplest first! (I haven’t any idea about 152 Hz)


      • Benoit says:

        Hi Bernie and Lisa

        I see you’re talking about a substation. Since I bought my MK30 GIGAHERTZ measuring kit, I measured the magnetic field on the overhead line that feeds the houses of my street in 380 Volts 50 Hz. I discovered several things:
        1. A 15000 V line goes underground in the sidewalk across the street in front of my house, it feeds the cabin which is 20 meters from the front of my house on the other side of the street. street in front of my neighbor.
        2. This cabin 15000V ::: >>> 380V provides about 300 houses.
        3. When the sky is overcast during off-peak hours, I measure 36 nT (Nano Tesla) that the institute http://www.buildingbiology.com describes as a slight risk to health.
        4. In the evening around 11pm when the meter goes into night mode, everyone starts the dishwasher, the washing machine, the dryer … the night current is cheaper. The amperage in front of my house becomes very important and therefore the magnetic field goes up to 120 nT that the institute http://www.buildingbiology.com describes as an important risk for the health.
        5. Curiously the HUM seems stronger at that moment but it is not instantaneous, it is progressive. My wife who also hears the HUM, finds the same thing, my neighbors too and a friend who lives in the nearby village near another low voltage cabin too. We thought that the impression that HUM was increasing at that time was due to the audible sounds that become less and less strong as people go to bed.
        6. When the sky is clear and very sunny, the magnetic field also increases to 80 nT (light risk but close to the significant risk that starts at 100 nT) because the photovoltaic panels that equip a house on four send power to the network. Yet the HUM seems less important when the sky is clear than covered. Unless the difference in atmospheric pressure is for something, I do not think that the HUM is created directly by that. It is perhaps this magnetic field that charges us and makes us sensitive to other low and high frequency waves. It may be useful to know if people who hear HUM sleep or live near a low-voltage booth and are therefore subject to a larger electromagnetic field.

      • Benoit –
        The link you provided for “risk” from magnetic fields does not seem to go to the data you quote, at least not directly, or that I can find. Please provide a complete link – thank you. Note that the fields you measured (?) are far less than the 1% of the Earth’s natural field.
        One problem with sites like the one you gave is generally that by clicking you too soon collide with “advocacy” concerns that are either PRO-smart-meter or ANTI-smart-meter. Neither side seems particularly concerned with scientific accuracy, logic, or clarity.
        I have personally encountered advocates giving numbers in milliwatts/meter-squared and calling that quantity “power frequencies”; and another giving a ratio of relative exposures that if you bothered to look had physical units of kilograms/square-centimeter (that’s zero)!
        We (the public) are cautioned to be weary of the ignorance (or is it the disdain) of experts.

      • Benoit at JULY 13, 2018 AT 10:43 PM Said in part:
        “. . . . . My wife who also hears the HUM, finds the same thing, my neighbors too and a friend who lives in the nearby village near another low voltage cabin too. . . . . .

        This (multiple hearers) of course suggests an external source such as power equipment – but what frequencies (audible pitches) do you all hear? When you say “cabin” does this mean a utility equipment enclosure like a substation (transformers)? If it is only 20 meters from your house, it would be no surprise if it were a source of significant acoustic vibration. Is it 50 Hz or 100 Hz or perhaps something else? This simple test is fundamental to any description of a hum phenomenon.

        I’m not sure what a MK30 GIGAHERTZ kit is! But something intended to measure RF/magnetic fields (you mention nT but not frequencies) does not seem suited to low-frequency acoustic studies.


      • Benoit says:

        Thanks for your reply Bernie
        You know it a year ago I already studied the HUM with sound measurements provided by the sound level meter RION NL-62 which goes down to 1Hz. I had already measured the transformer (low voltage cab) and we had detected 50db at 50 Hz at only 2 meters. In my house, the 50 Hz melted in the levels of other frequencies and did not exceed them any more. I detected noise from refrigeration units of 84 dB between 4 Hz and 1.2 km from the house and all residents had health problems around them.
        A few months later, I realized that the HUM was not an external sound but a sound produced internally by one or more external sources.
        You know, when we exceed 20 Khz we rarely talk about db but other measures that you mention, some use the V / m microwatt / m2 …
        Today, I am convinced that HUM is produced by microwaves emitted by GSM antennas, Radar, Sattelites as Glen recently mentioned for the latter. Professor Belpomme of Paris finds an opening of the blood-brain barrier.
        Shortly before the acquisition of the MK30 kit from GIGAHERTZ SOLUTIONS, I found a very sparsely populated place far from the GSM antennas (here in Belgium the antennas are mapped on ibpt.be and the site is accessible to all). a moment (between 15 and 30 minutes) the HUM has disappeared. Once back home, no HUM and after a few hours, the HUM comes back as if our body is a battery that takes a long time to load or unload. The MK30 kit has confirmed my feelings by HF and LF measurements close to 0 in this “white zone”.
        Where I wanted to come here is to be able to define why one person hears the HUM and not another, I think that all depends on the impact of the high frequencies but also of the low frequency environment taking into account the time factor of exposure.

      • What exactly did I mention?

      • Benoit says:

        In your video, the microwaves emitted by the satellites, Glen.

      • Yes, I said they were not responsible for the Hum.

      • Benoit – here are some replies to your comments which I quote:

        “. . . . . RION NL-62 which goes down to 1Hz. I had already measured the transformer (low voltage cab) and we had detected 50db at 50 Hz at only 2 meters. . . . . .”
        ———–Do you have a screen capture of this result? For comparison, here is a youtube video of the strong 100 Hz second harmonic of a 50 Hz station “Awesome hum of electricity substation” :

        . . . . . I detected noise from refrigeration units of 84 dB between 4 Hz and 1.2 km from the house and all residents . . . . .
        ———-Obviously you didn’t hear this 4 Hz audio – what documentation do you have of this observation?

        . . . . . A few months later, I realized that the HUM was not an external sound but a sound produced internally by one or more external sources . . . . .
        ———-On what evidence, specifically, do you base this spontaneous claim?

        . . . . . You know, when we exceed 20 Khz we rarely talk about db but other measures that you mention, some use the V / m microwatt / m2 … . . . . .
        ———-Meaning just what? Describing a value in db is just mathematical, and DECEASES information. Indeed db is often (usually) used for sound – but you NEED TO ALWAYS specify the reference level! In contrast to sound, V/m is for electric field. Microwatts/m2 is a power density. So what. Nothing to do with frequency.

        “. . . . . Professor Belpomme of Paris finds an opening of the blood-brain barrier. . . . . .”
        ———-Which would relate to microwaves how!

        “. . . . . a moment (between 15 and 30 minutes) the HUM has disappeared. Once back home, no HUM and after a few hours, the HUM comes back . . . . .
        ———-What hum are you talking about nowa? 50 Hz? So, following a return trip, the hum remained missing (due to travel?) for a few hours. Logically you needed to wait a few hours in your quiet zone to see if the hum correspondingly APPEARED. Did you do this?

        Thanks – Bernie

      • Benoit says:

        In answer to your questions Bernie:
        1) I do not have a screenshot of the transformer measurement because in the house the measurement was weak.
        2) I have a screenshot of the measurement of the refrigeration units, I send you by mail.
        3) On my own analyzes and those made with my wife who has the same observation as me.
        4) The frequency must be taken into account when determining the source of pollution The NARDA SRM-3006 device measures in V / M and in microwatt / m2 for each frequency.
        5) Professor Belpomme studied in 5 years 1500 cases of people suffering from waves. An opening of the blood-brain barrier was observed. Microwaves are also used to voluntarily open the blood-brain barrier that protects the brain against polluted blood so that it can inject a treatment that would not otherwise work.
        6) Yes, I did this experiment. Arrived at destination, the HUM is still there and after 15 to 30 minutes it disappears. Back home, he is no longer there and reappears after a few hours. Same experience with my wife and same observation.

      • Keith Hamlyn says:


        Just a couple of points.

        Your (4). The NARDA SRM-3006 is specified down to 9KHz. It is generally understood that the HUM described on this blog is in the region of 50Hz to 200Hz, which means that this equipment cannot measure it. It can, of course, be used for measuring microwave frequencies up to 6GHz. This link shows that : https://www.narda-sts.com/en/selective-emf/srm-3006.

        It is important not to muddle microwave frequencies with those that are detected audibly as HUM. This site has shown clearly that there are two types of HUM, the real HUM in the head that few can hear and the noise that is frequently heard that has been generated externally by power distribution and other sources. You may be in some danger of introducing a pseudo-HUM derived from microwave sources that may well affect people, but is not similar to the two forms just mentioned. Personally, I am of the opinion that the field strength from satellites, GSM masts or similar is so low that it cannot affect people.

        In passing, a great friend of mine was working in one of two huts during world war two. The huts were joined by a power cable. The grass was lush under the cable, which made the physicists there believe that this was the effect of the power line. It turned out to be caused by the birds who perched on the cable and left their droppings to fertilise the soil. The moral of the story is that we must look for the obvious first!

        Best regards,

      • Benoit says:

        Hello Keith thank you for your response.
        It’s been 18 months since I started studying HUM full-time.
        At first I also thought it was an audible external sound in the low frequencies it was a mistake. After eliminating the beating of industrial and other machines, the HUM was still there and in remote areas of machinery and pipelines.
        The HUM is perceived in the same way everywhere and is described between 50 and 200hz if you say it but it does not certify that it is created in this frequency range, it is also impossible that it is produced by a single source of low frequency would be the same for everyone.
        One day when the HUM was strong, I pumped my heart and the HUM increased and decreased at the same time as the beats.
        This is where I realized that it is created internally.
        In a weak area in the high frequencies and weak in the magnetic field it disappears after a few minutes and my devices confirm at this point low values close to zero which means that it is not external but audible internally and created by a external phenomenon. When I get home, it comes back after about 6 hours, which also confirms that it is not an audible low frequency external sound, otherwise I would hear it instantly.
        We must question our conventional wisdom, so far we have all spoken about the sounds of machines, generators, transformers, fans, pipelines, wind, ocean waves … without success. Sometimes it takes a change of direction to find the solution, to move forward focusing on what is meant to be heard, but also on what is felt and the symptoms common to people affected by HUM. You say that these are not the high frequencies? This is the last phase of my study soon: see if I can separate from the HUM in the presence of high frequencies only or the magnetic field only.
        I will reveal very soon the result of this last analysis.
        I like your example at the end of your comment, it is proof that sometimes the solution is in another direction and it is my motivation.
        Best regards,

      • Benoit at JULY 15, 2018 AT 1:46 PM SAID IN PART:

        “. . . . . 1) I do not have a screenshot of the transformer measurement because in the house the measurement was weak. . . . . . “
        (???) But – – – you said it was 50 Hz, so I suppose your instrument caught it. Is this correct? Was that outside near the transformer? Are we talking about an audible hum now known to be 50 Hz?

        “. . . . . 2) I have a screenshot of the measurement of the refrigeration units, I send you by mail. . . . . “
        Got it – thanks. It shows a sub-audio, broad but also low-pass spectrum, with a mild peak at 4 Hz. (Like a fan?) Why not post this for everyone?

        “. . . . . 3) On my own analyzes and those made with my wife who has the same observation as me.. . . . . “
        With all due respect, this response does not constitute a convincing presentation involving evidence, analysis, and logical conclusions. Real science needs such details.

        “. . . . . 5) Professor Belpomme studied in 5 years 1500 cases of people suffering from waves.. . . . . “
        What in the world does ‘suffering from waves’ mean! Do you have a link or two?

        “. . . . . 6) Yes, I did this experiment. Arrived at destination, the HUM is still there and after 15 to 30 minutes it disappears. Back home, he is no longer there and reappears after a few hours. Same experience with my wife and same observation. . . . . . “
        Thanks – this helps. But we do need to clarify what hum you are hearing. Have you pitch-matched to anything? You don’t really say. And of course, an area devoid of cell towers is probably sparse in other things (substations, supermarkets., etc.). You need controls! What happens if you drive the same time frame to a cell-noisy region, or perhaps to a lonely cell tower in an otherwise bucolic area? Etc.

    • in line with my suggestion of simplest first, here is a 5-page webnote on displaying low-frequency acoustic buzzing with minimal resources and hopefully minimal ambiguity.

      Click to access ENWN55.pdf

  13. Lisa M. Allen says:

    Hi Bernie, Thanks for that summary and also for the link to those documents. I have read some of it already but not all, but will try to do so this weekend. I have been to the substation about five times, but the only time it was very loud and where it sounded like the hum was the first time I went. Every other time it was very quiet. I don’t know why that is. I’ll keep going since it’s so close to my house and if I can catch it in it’s loud cycle, I’ll see if it matches the 120 hz sound on the Online Tone Generator, and also take screenshots with the Spectroid app, and report back. Thanks for your help!

  14. Michael and JIll MURPHY says:

    Hi, I think all you hearers should look up a pipeline map of your area. I heard the hum for years then I started thinking it may be from a pipeline. It lies about a mile from my home. I could only hear the hum in my house, yard and driveway. I walked the nearby roads and could not hear it. Knowing some respiratory physics I thought the hum was cause by a clog in the line causing the pipe to vibrate the bedrock leading to my property. I called the pipeline co. every morning after hearing it all night. I called alot! They told me they did not have a “pig” to clean the line but would get one in the furture. Then one day the hum was gone.I havent heard it for 2 years now. I guess they cleaned the pipe. I also heard the hum in Utah on a camping trip, near the Mcphee dam in Colorado and in a meadow campsite north of my home. Looking at the pipeline map the same pipeline ran thru these areas. It was so bad that I could put a wine glass of water on the table and see the water vibrate to the rhythem of the hum. I could see it in my pond on a windless day. It made one of my dogs roam the house at night probably looking for a quiet place to sleep. It made me ill! I am so happy it is gone and I hope for good. So look for nearby pipelines and call the company and bug the crap out of them! Goog luck, Jill

  15. Lisa M. Allen says:

    Bernie (or anyone else), is it supposed to be easy to identify the sound of 120 hz? The reason I ask is because yesterday morning the hum was very loud in my house, and it was that droning sound (as opposed to just a pulsing sound) so I pulled up the online tone generator. It was defintely in the range of 120-140 but it was hard to pinpoint the exact tone. Is that normal not to be able to tell exactly what the hz was?

    • Lisa – good question –

      Aside from professional musicians, it is probably not “normal” for many to be able to pitch-match easily. And musicians probably do most of their matching to much higher frequencies like the A4=440 Hz the orchestra tunes to. But down at 120 Hz (or much much worse at 60 hz), things are even less normal! Here are some suggestions:

      (1) Practice and experiment, Try also the triangle (small but significant harmonic content) as well as the sine. Try to mimic the OTG by singing (humming).

      (2) if you have an old stereo system (the older the better!), the “electrolytic” capacitors in he power supply may be deteriorating and producing exactly 120 Hz “AC Hum” that is a constant (possibly tolerable) background in the loudspeakers with the volume turned all the way down. A useful reference sound, but importantly, likely very similar to the hum of a substation.

      (3) As you play the OTG while listening to the your hum, try 119 Hz and 121 Hz as well as 120 Hz. You are listening for “beating”. This would be heard in the case of 119 and 121, as a subtle but noticeable “shimmering” effect that is NOT there with 120 Hz, and the shimmer cycle is exactly once each second.

      Each time you try something new – it gets easier – at least in theory!

      Have fun – Bernie

  16. Lisa M. Allen says:

    Bernie, thank you! There are also different choices on the OTG (triangle, square, etc). Is one better to set it in then the other?

    • Lisa – another useful question.

      I know you are a conscientious reader so I can justify a full response.

      If I set the OTG to, say 50 Hz, the sine, the saw, the square, and the triangle all have a frequency of 50 Hz and a pitch of 50 Hz. The difference is that the sine is rather mellow (harder to hear) while the other three are “edgier”, easier to hear, and in fact SEEM louder, DUE TO HARMONICS.
      When we read that the human ear hears from 20 Hz to 20 kHz (or thereabouts) it refers to sine waves. These limits are not sharp cutoffs, but gradual. In fact, the response at 50 Hz is already dropping. However, if you are talking about a 50 Hz sawtooth (for example) it is easily heard.

      Try this: listen for a setting of an 80 Hz sine and then press that triangle button. You heard the sine, but with the triangle the pitch becomes much more apparent (although you still hear the original). With square or saw, the original pitch still is heard although the “timbre” (tone color) is even more penetrating.

      Strongly-pitched comparison waveforms (like a saw) are often preferred for pitch testing, but if the harmonic content is too great, a difference in timbre may overwhelm a similarity of pitch. A triangle is possibly a good default.

      A triangle of 50 Hz has a fundamental (of amplitude 1) of frequency 50 Hz (like the sine) but also a 3rd harmonic (150 Hz) of amplitude 1/9, a 5th harmonic (250 Hz) of amplitude 1/25, and so on – relatively weak harmonica content. You won’t hear (“hear out”) the 50 Hz fundamental of the triangle any better than with the sine, but you will hear the much stronger pitch of 50 Hz due to the 150 Hz and 250 Hz harmonics which, heard together, although relatively weak, support a “missing fundamental” (a perceptual phenomenon) of 50 Hz.

      A person who is experiencing a Hum (internal or low-frequency tinnitus, which none of us have ever seen on an oscilloscope) is probably a fundamental with a few weak harmonics. On the other hand, a real (acoustic) buzz like from a pump or compressor might well have a large harmonic content. The “magnetostriction” buzz of 120 Hz as from a power station would NOT have a 60 Hz fundamental. Rather it is generated by a non-linear process and has its fundamental of 120 Hz and odd harmonics of that.

      So be prepared to experiment and observe. – Bernie

      • Lisa Allen says:

        Bernie, thank you for that explanation. I have to admit a lot of this is over my head. I will have to educate myself on some of the terms and concepts (ie, magnetostriction) to fully understand this. But for the time being I will use the triangle setting on the OTG when trying to match the tone of the hum.

  17. Jade says:

    I forgot to say I got a recording of it when I filled out the report

    • George G. says:

      Lisa, or anyone else,

      Could you please tell me what a Drone Recording is?

      I activated the ‘ recorded hum’ and what I heard is not The Hum, but some type of motor/engine/propeller or fan.

      Is someone jerking us around here?????

  18. Lisa Allen says:

    George, I agree that the recording did not sound like the hum, at least as I hear it, but, that said, none of the recordings or simulations sound like what I hear so I have low expecations with these hum recordings. I don’t think they’re jerking us around, though. I think they are really hearing something but the recording either isn’t the hum that we hear and is something in the environment up in Rochester, or, they just simulated the hum. Having lived up in that area I think most of those people are sincere and not pranksters. But yes, the Drone Recording is kind of weird and doesn’t sound like the hum, I will grant you that.

  19. Lisa and George –

    It does seem to be a tone of 315 Hz that is quite steady. Since it was recorded, heard by many, and pitched quite high, it seems to be a REAL acoustic phenomenon, not our traditional otoacoustic (internally sources), “diesel engine” Low-Frequency Tinnitus (LFT).

    Apparently the raw audio is the first file, which seems broad-banded. Professor Lee of the U of R had apparently “enhanced” this for the later three examples. The D&C article does not specify how, and would not have been expected to have done so. I have emailed him asking for details which I shall share here if I get them.

    We can make a good guess that the “enhancement” is basically a sharp bandpass filtering about 315 Hz. If the input to this BP filter is broad-banded, like white noise, the output spectrum would be sharp as shaped by the filter’s frequency response, automatically. This would sound much like the enhanced signals offered – a noisy sine wave for 315 Hz.

    To test for being misled in this way, one would normally move the center of the BP to perhaps 305 Hz and then to perhaps 325 Hz to see if the tone follows, of more favorably remains at 315 Hz or just disappears. We don’t have information about any such control test.

    There are two items that we do have that suggest that Lee did in fact “dig out” a 315 Hz frequency from the input signal rather than from a broadband input spectrum.
    (1) The 315 Hz at the output has minor (as opposed to major) amplitude fluctuations. BP white noise (colored noise) tends to fluctuate in a “spooky haunted house” way, unsupported by a strong original component.
    (2) Once you hear the enhanced versions, it is just possible to “hear out” something very much like 315 Hz in the original, but very weak.

    Note as well, that the 5th example (July 11, with the birds, but apparently unenhanced) has no 315 Hz but rather a very strong 581 Hz.

    BTW Lisa – good find!


    • I just saw that there are two follow-up articles to the June 1 one Lisa posted. They are dated 06/19 and 07/23 (a few days ago).

      Apparently they added the 5th audio example,(which agrees on the 580 Hz new tone) to a previously standing list for the upcoming July 23.

      Google: Hum Rochester D&C

      Mystery not solved.

  20. Lisa Allen says:

    I just listened to 580 hz on the online tone generator and that’s a pretty high pitch! I hope they figure it out soon. I wonder if somehow it’s related to being so close to Lake Ontario.

    • Lisa – indeed apples/oranges: 580 Hz is about the D above the C that is an octave above middle-C. Even 315 Hz is about the E-flat above middle-C. The pitches in the examples are decidedly mid-range.

      Incidentally, there is yet another pitch – this one on the article’s main video at about 47 seconds in (Pizzeria sign). It is only about a second long and is hard to match, but I make it roughly about 340 Hz. Anyone else hear this?

      They all (315, 340, and 580) seem like motors/fans.

      – Bernie

      • George G. says:

        I’m begining to see a familiar pattern here.

        1. Someone records “the hum”
        2. The recording undergoes expert analysis
        3. The expert declares the the source of the hum is an acoustic phenomena
        4. The World Hum is then swept under the carpet

        History has a wonderful way of repeating itself, just look at how easily New Zealand’s mysterious hum was identified.

      • Keith Hamlyn says:


        Whilst I fully accept your items 1 through 3 as being correct, your item 4 may need some thought. What has been said many times on this blog is that World Hum is very real, but is not very common. What is recognised is that many people hear noise that is acoustic and that is not World Hum. We have just that at our home. It is important to differentiate between the two – although both cause pain and irritation in equal measure – and to look for a solution to the one that afflicts you.

  21. George and Keith –

    Your comments have reminded me that I never got around to finishing and posting a webnote study and histogram relating to pitches in Glen’s data base, and to the fact that there are almost certainly two types of hum hearers (various external acoustic hums; and internal otoacoustic, traditional Hum). So I just decided to make a few changes in the text from 6/18/18 and post as-is with today’s date:

    Click to access ENWN56.pdf

    This notion of two types of hum is not new. Provisionally we supposed that a roughly 50:50 split (perhaps 75:25 or 25:75) might occur. As a result of what is here, something close to 50:50 seems most likely.

    Determining which type of hum you are hearing (see “checklist” of ENWN53) would seem an essential first step.


    • Keith Hamlyn says:


      I fully concur with your notion, although my feeling (and it is just a feeling) is that the split may be slanted more heavily towards the external acoustic. Undoubtedly, you have hard data to work with. It is possible also that many folk have not gone through the checklist and assumed that they are hearing the Hum. Isn’t there a very low percentage quoted somewhere in this blog?

      Best regards,

      • Keith –
        In the original Mullins/Kelly study about 1995 (apparently most recent link fails) they found that only 2% of the GENERAL PUBLIC heard the Taos Hum. This number is probably ballpark. Extrapolating, if you hear the Hum (internal low-frequency tinnitus (LFT), traditional) you are apparently one in about every 50 on earth. That source is “incompletely understood”! If on the other hand, you are talking about a bulldozer running right outside a window, we would suppose nearly 100% of the general public would hear it – and the source would be well understood. Distant and/or very weak acoustic events remain a problem.
        Here I was looking at people who hear something, are bothered enough by it to find Glen’s site, have taken steps to try to find the source (and largely failed), and who took the trouble to fill out Glen’s questionnaire as best they can (Thank You). A population very far from general public. My study was aimed at showing:
        (1) That at least a portion of those who entered data could be at least approximately SEPARATED into LFT types and real-sound hearer types based on this data. It appears they can be (my Fig. 1 group vs Fig. 2 group). Further effort, perhaps starting with my “checklist” http://electronotes.netfirms.com/ENWN53.pdf , might put one in the correct camp.
        (2) If the folks entering useful data tend to be mainly LFT types or real-sound hearers. It would simplify things if most of the data (say 95%) were from one type so that the other could be (academically) ignored! Both histograms seem about equally populated, however.
        (3) If there were any strong trends in the pitches reported. There were not for either class – both are quite broadly distributed, the LFT being slightly narrower (30 Hz – 90 Hz). The useful take-away is that it is doubtful there are any strong regional sources of any external nature – else many more people would get the same pitch or pitches.
        * * * * * * * *
        I think the “external acoustic” tally is a double edges sword. You pick up more hearers because almost everyone is potentially a hearer. But the count decreases because the real source is often found and corrected, or at least no longer a mystery.
        – Bernie

      • Keith Hamlyn says:


        That makes complete sense, in that the population in the survey is heavily skewed away from the General Public towards the 2% and more (speaking statistically) who have heard either the Hum or what my wife and I have called the Noise. We prefer that term, as we hear it resonating inside the ouse at a greater volume than outside. We still cannot trace the source, although we have some ideas, but it is still affecting both us us dreadfully. Unfortunately, the law in the UK requires the source to be found before it can be reported to the Local Authority as a “nuisance” under the Environmental Protection Act.


  22. Click to access ENWN53.pdf

    Most of my Elecronotes “webnotes” etc. are references to whatever one is the most recent.

  23. Lisa Allen says:

    Keith, did you and your wife start hearing the noise at the same time? Does she hear it as often as you do? Has anyone else heard it in the house? And lastly, do you hear it elsewhere in your community, or even outside of your community? My husband has heard our hum, or noise, three times he says where it woke him up, and many other times when not sleeping. I really think now that it is both internal and external. Obviously that we can hear it at all while most others don’t means that something is working differently in us (the internal part), but the fact that it doesn’t sound the same everywhere, that there are periods where it is absent and places that are quiet, and times of day when it is very loud and other times when it is barely audible, seems to suggest to me an external component.

  24. to Keith Hamlyn JULY 30, 2018 AT 8:59 AM

    Keith – thanks

    (1) You previously said:

    (A) Keith FEBRUARY 16, 2018 AT 11:02 AM
    “ … Incidentally, the transformers are around 200 yds from us and have been tested by UK Power Networks and found to be working correctly, so that is not the cause. There are no main power cables under the house, which was built in 1825 (not old in the UK!). … “
    (B) Keith Hamlyn FEBRUARY 18, 2018 AT 12:21 PM
    “ …Firstly, we live in an end cottage that is one of five joined together. There is an overhead power cable attached solidly to the outside wall and feeding next door. All the cables in the village are overhead, except for the two leading to our house and next door, which are both buried. …”
    * * * *
    Contradiction? Can you clarify this? I tend to envisioning HV mains feeding a pole-mounted transformer, the output of which is three wires (presumably dual phase 220 V) swinging 200 yards to the side of your house (perhaps with intermediate support; 200 yards being a long suspension). A pretty good “tin-can telephone” acoustical link for transverse sound.

    (2) You said that you AND your wife both hear this. That (as you know) is a pretty certain checklist item for an externally sourced acoustic sound.

    (3) You have previously provided an acoustical spectrum printout showing principally 100 Hz with 200 Hz and 300 Hz harmonics. Again, evidence of not only an external acoustic source, but one with the power company responsible.

    (4) If you want to consider house resonances, simply connect an audio function generator to a loudspeaker, and look for peaks in the sound level with a simple meter (probably $50). Try several locations in the house.

    (5) If the transmission link is indeed mechanical/acoustic, transformer to exterior wall, instead of attaching these long (mechanically tensioned) wires directly to the wall, the power company could (easily?) add a pole just outside your house (say 4 feet away) to interrupt and absorb the sound. The last four feet could be completed with short slightly drooping connectors. Just a thought.

    – Bernie

    • Keith Hamlyn says:


      Lisa first:
      My wife and i both hear the Noise at the same time, as does our next-door neighbour. As i have mentioned previously, this differentiates it from the Hum and, as Bernie states in his item 2, it is clearly an externally sourced audio/acoustic sound. We live on a piece of Common land, which is a grass sward. The sound can be heard across the Common by others, which is a further indication that it is a Noise. It continues day and night, keeping my wife awake, although it varies in amplitude. It seems to be louder in the afternoon and in the later evening, but is loud now as I write (08:30).

      Then Bernie:
      (1) I may have confused my explanation over two uploads. We live in the end cottage that is one of five. Our house is fed by one phase of a three phase cable that is buried. Each phase is nominally 230v 50Hz, as we are in the UK. The other two phases are not connected. The three phase is derived from a pole at the end of the garden, around 50 yards away. The cottage next door is fed by a single phase overhead cable that is mounted directly and solidly to the join between the two houses. The other end is attached to the same pole.

      I have some doubt that an acoustic signal would be transmitted down the overhead cable, as it has a fairly loose catenary shape, i.e., it’s not like a violin string and is pretty droopy. It would also have to be the correct length to resonate. It is one of several that are in series, which could mean that all would have to resonate. My feeling is that this is a low probability.

      The results of monitoring over a week showed that the power entering the house met all the relevant UK standards for power distribution. The results of the tests on the transformer were within specification also.

      There may be some other explanation that I have missed. There is an assumption that the source is magnetostriction occurring in a transformer nearby. If so, it would be interesting to discuss the physics behind the transmission.

      (2) The Noise is definitely externally generated. It is not the Hum.

      (3) Agreed.

      (4) This sounds like a good idea. I need to source an audio generator.

      (5) I feel that there would be some resistance to a pole four feet from the house, not only from UK Power Networks, who are the supply distributer in the part of the UK, but also from those closer to home! Having said that, it might be possible to request that they replace the mount with one that is acoustically isolating – an anti-vibration mount of some kind. I will also re-open the conversation with the environmental specialist at UK Power Networks, who was very helpful in the past.

      (6) there is also a suggestion that the Noise may be generated by the water pipelines, so I have also requested assistance from them.

      • George G. says:


        You mentioned in an earlier post that you are going to attempt to find the “noise” by using “some form of direction finding equipment at
        audio frequency—” Any luck?

        Are you a Hum hearer, or are you confusing the Hum with mains power grid generated noise?

      • REPLY
        Keith Hamlyn JULY 31, 2018 AT 11:52 PM SAID IN PART:
        “. . . it’s not like a violin string . . . “

        This is true, . . . . . but I think you have the wrong physical model in mind. We are not talking about a natural vibrating string (wire) with TRANSVERSE vibrations subject to parameters of length, density, stiffness, and tension. Rather it is a LONGITUDINAL (along axis) transmission of a DRIVING vibration at one end. The “loose catenary” shape matters little. It is very much a tin-can telephone.

        I may have missed it, but I don’t recall your saying if you achieved a pitch-match? Your spectral chart was very much 100 Hz. Is this what you hear? Compare my posted link above for July 15 at 8:59 PM; the 50 Hz power substation with 100 Hz hum. By the way, if it hums it should not be called “noise”.

        – Bernie

  25. Lisa Allen says:

    I work part time as a caregiver and today I brought my client, a woman in her late 80s, to the doctor’s office. As she requested, I went in with her to one of the examination rooms, where I immediately heard the hum loud and clear. I asked my client if she could heard the noise (I had told her about the hum) and she said she didn’t hear anything. Shortly thereafter the nurse came in and after their consultation, I asked her if she heard anything (I couldn’t pass up the opportunity to ask because it was so loud). At first she said, “No.” And then she said, continuing to listen, “Just a hum.” It made my day to know that someone else could hear it too! I can’t help but wonder if it sounded a lot louder to me then it did to her, and if that’s why only occasionally my husband can hear it too (when it’s very loud). A real sound seems to be there but maybe something within me is amplifying it. Also, at first the nurse said she didn’t hear it, but then said she did, which also seems to indicate that it wasn’t an obtrusive sound to her as it was to me – more like the gentle humming of a refrigerator, whereas to my ears it was reverberating loudly. I know some here think there are two types of hum – the “real” hum which is internal, and the hum which is acoustic. But I can’t help but think that for some it can be both, as it seems to be with me, maybe.

  26. George G says:


    Something you need to be aware of:

    “Otoacoustic emissions can be spontaneous or can arise in response to sound input to the ear, in which case they are known as ‘evoked otoacoustic emissions’.

    Ref. Tinnitus: A Multidisciplinary Approach by D. Baguley, G. Andersson, D. McFerran, L. McKenna

    This book is worth reading Lisa.

    Cheers, and thanks for your input.


  27. Keith Hamlyn says:

    George G: I am still working up the equipment. I have now built a variable frequency by-pass filter. I am hoping that I will be able to isolate the Noise from the background. My fear is that there will be so much thermal noise generated in the front end electronics that this low level Noise that we hear will be submerged/masked, despite using low noise amplification. I am also having some difficulty sourcing a sound generator that will feed a loudspeaker. They seem to cost anything up to $1000 – or £1000 whichever way you look. I can confirm that this is a Noise and not World Hum. I have been around this point many times on this blog. It is external and therefore measurable.

    Bernie: I hadn’t heard of this form of propagation in high voltage transmission lines. Presumably, the driver for that is vibration of laminations in a nearby sub-station (magnetostriction and/or winding stress displacement variation) and . Is there any scientific reference that I can look up to learn more about how this works? I can then write to UK Power networks in strength, knowing a little about it. As far as a pitch-match, both my wife and I are musicians. The Noise has the characteristics of a pump or fan and is a mixture of frequencies, the prime being 100Hz with 200Hz and 300Hz visible above the noise floor of the equipment that was used to make the recording. You have seen the spectrum earlier.


    • Nothing mysterious here. Nothing to do with voltage – it’s just a metal wire. Sound IS a longitudinal (parallel to line of travel) compression wave. Presumably it starts with a pull or push (periodically) near the pole transformer. The impedance match, solid pole to solid wire, is excellent there; unlike the poor match (pole to air) of a hum that might reach you sanding nearby below.. It then travels along the wire axis (even as slightly bent perhaps), radiating very little sound (damping some tiny amount as heat) and arrives perpendicular to your wall which it shakes with some enthusiasm.

    • Keith – what is a “by-pass filer”?

      How much power are you intending to drive your loudspeaker with – and just why?

      Why not use one of the online tone generators and an ordinary audio amplifier which you probably still have from the old days?

      It’s not clear what you are trying to do. If it’s direction finding aren’t you just receiving existing sound?


      • Keith Hamlyn says:


        The principle seems to make a great deal of sense. I guess my only problem would be in locating the source of the Noise.

        The configuration for this particular part of the installation is that there is a three phase cable that passes around the Common – a green sward around 100 yds across by four hundred yards long. There are take-offs to the houses from the overhead cables that are supported on poles around the Common. Note that our house is served by one phase of a three phase cable that is underground from the pole that also supports a cable to the next cottage that forms one building of five cottages. Certainly, the support wire for the overhead cable is firmly attached to the wall at a point at the junction between the two cottages. Presumably, the Noise can travel along the entire overhead system, including into our houses. Ones concern, however. There was a power outage recently: the Noise did not go away, which I would have expected.

        I muddled my worms (apologies for the malapropism). I meant a variable bandwidth audio filter. This is a design by a radio ham, Eric Edwards GW8LJJ. The design can be found in the May 2018 edition of Practical Wireless. It was designed to assist CW (morse) operators to resolve signals from the clutter that there is on the shortwave amateur wavebands by filtering out unwanted frequencies to leave the one that is wanted.

        The direction finder design so far will (probably) be made up of two channels each consisting of a ceramic microphone, a low noise preamplifier and a filter. These two channels will be mixed to provide a single signal. With the microphones half a wavelength apart, this should result in nulls when pointed in the direction of the source of the Noise. Note that I may feed the two channels into an op-amp to mix, in which case I should see peaks in the direction of the source. Of course, if the source is multiple, the direction finder will be as much use as a chocolate coffee pot!

        The audio generator has two purposes. (1) testing the filter to reveal the 3dB points and (2) to (separately) see whether or not our rooms are resonant at 100Hz, 200Hz, etc. I hadn’t thought of sound generators on-line. I’ll look into that.

        I hope this clarifies things a bit.
        All the best,

  28. Lisa Allen says:

    George – Thanks for the recommendation, but that book in paperback is $55.00! The Kindle version is only a few dollars less. I will read the American Tinnitus Association’s website and see what I can learn. (https://www.ata.org/).

  29. George G. says:


    I share your concern with low-noise amplification. Regarding the audio gen. $1000.0 is far too costly. Perhaps you could put together a driver using some surplus audio equipment? Anyway, good luck with the project and keep us posted please.


    No need to buy the book. The quoted line suggests we, as Hum hearers, are susceptible to mistakenly confuse external hum with our Hum.

  30. Lisa Allen says:

    There was no confusion about what I heard in the doctor’s office. It was the hum. I can differentiate that from a normal hum coming from an appliance.
    Also, the hum I hear is not spontaneous; it’s predictable. It gets loud at night, just about every night, like clock work. It gets loud when it’s overcast.
    It gets loud in the summer. It’s quiet around Christmas. That isn’t spontaneous and suggests to me it’s man made. I like to look at Henrik’s logic map (https://hummap.files.wordpress.com/2018/02/world-hum-logic-map-rev7x.pdf) occasionally because it reminds me of all the possible causes, and regardless of the certitude of some that it’s internal, I am keeping an open mind because I don’t think we have all the answers yet.

    • George G. says:

      The hum is predictable—–Check.

      The hum is man made—-Check.

      You now posses a reasonably good quality recorder—Yep.

      I eagerly await to hear your recording.

      Good luck!

  31. Theodore Shin says:

    My wife and I live in Virginia, and we started hearing this high pitch sound since early this yead, the interesting part is when my parents in law came over, and they both heard it too.
    At firsf, I just thought it must have been some sort of elctronics that we got from our friends which are for our new born bab, but we heard it in the car sometimes, and even when we went down to North Carolina visiting my wife’s grand mother, and she heard it too.
    Now whenever my wife hears this mysterious noise when she’s home alone, she literally freaks out.
    I personally don’t really care where this sounds coms from, but now it started irritating me because I don’t know what this noise is.

    • Theodore Shin at AUGUST 6, 2018 AT 9:02 PM, SAID IN PART:
      “. . . . and we started hearing this high pitch sound since early this year. . . . .

      It would be most useful and a most important starting point to know what pitch you hear. You say “high pitch” so it probably isn’t “The Hum” so often at issue here, which is decidedly low in pitch.

      We hear from about 20 Hz to 20 kHz, perceived logarithmically. To me 1 kHz is very-high, two octaves above middle-C, although only 5% or the way to 20 kHz! And do you both hear the same pitch?

      • Theodore Shin says:

        Gosh we just heard it while feeding our babt in the bed, I have a harmonica, c key, and it was an excat high D, the eighth hole, draw note.

  32. Theodore Shin says:

    P.s. my wife and I are gonna start writing down the time whenever we hear this noise.

    I think it is VIRTUALLY CERTAIN that there is a traditional Hum which manifests itself as a phantom “diesel engine in the distance” perception that is an INTERNAL creation of the hearing mechanism of some people, perhaps only 2%, of the general public. This I myself “hear” 24/7/365. My “checklist”: http://electronotes.netfirms.com/ENWN53.pdf gives 8 items that one can consider as tests of this Low-Frequency Tinnitus (LFT) or “otoacoustic” Hum. No one has offered any objection to any of these proposed tests. If you fail one or more of these, congratulations – you are not part of the 2%, and you may be on the path to solving your affliction.
    On the other hand, it is ABSOLUTELY CERTAIN that some hums are EXTERNALLY sourced as real ACOUSTIC sounds. If we park a running bulldozer outside your window, you, others in your house, and even an LFT sufferer will hear it. It will certainly fail most or all of the checklist tests. You would also almost immediately discover the source.
    It is in cases where the bulldozer is two blocks down, or the sound comes from a municipal pump, power substation, commercial coolers, etc., where we may well have more difficulty. We hear only a relatively weak hum, and while it generally fail the checklist items (when carefully done), the SOURCE is not readily apparent. So while some external sources may be located quickly and easily, the weaker ones may remain conflated with LFT for some time. Welcome to the real world of ambiguity.
    It is NOT logical to supposes that either hum phenomenon is (based on any one person’s evidence), correspondingly, either internal or external for everyone else. A person who believes he/she hears a LFT Hum on the basis of passing all the checklist tests, and having looked VERY hard for alternatives, is probably right in his/her case, but nonetheless unjustified in supposing that everyone else who hears any hum must be similarly situated. Likewise, a claim of an external source, (most likely corresponding to the failure of a checklist test – even perhaps mindfully), is probably right personally as well, but unjustified in generalizing.
    People vary in many ways – including a tolerance for various annoyances and a curiosity about what is going on around them. Folks finding Glen’s website and commenting here are, we might well assume, below average in TOLERANCE (some buzzing – driving me nuts!) and above average in CURIOSITY. Such persons would probably soon solve the “easy” cases of a strong real sound. This would probably mean that those still hanging around here are “enriched” with those who suffer LFT; or who hear weak/obscure real hum sounds.
    Even more individual variability is found in the acumen of people reading and posting here – when it comes to understanding sound propagation, and more generally, collecting and analyzing scientific evidence. This is not to suggest that SOME people with scant scientific background are not capable of relating (in very useful details) what they actually personally OBSERVE. [Of course, others should be embarrassed by a foolishness and haughtiness.] With Glen’s encouragement, and his example, rationality and logic rule here. This makes it possible to consider, broadly, an array of well-considered reports. Can this strong basis be selectively conglomerated into a high validity collection leading to a convincing conclusion? We can at least get a start.
    In the comments and DATABASE on this site is a considerable, exploitable, goldmine of high valued data. We can look at a data-line and make a judgement as to whether the poster is an LFT hearer, an acoustic hum hearer, or most usually (possibly 75%), we can’t tell for sure. So let’s concentrate on the best submissions. Based solely on submitted data, without any disrespect or recriminations, discard anyone (the vast majority) who don’t seem to rather exactly fit LFT or real-acoustic. Put the remainder into their respective tally. What do we have?
    The study here, thanks entirely to Glen’s reset of his data base, was aimed at showing distributions of matched pitches. It also showed the split between LFT hearers and real-acoustic hearers. Of 631 map points, 84 (13%), Fig. 1 histogram, seem to be LFT and 75 (12%), Fig. 2 histogram, seem to have a real-acoustic source. Of the 631 points, 75% were judged to be incomplete or indeterminate. So based on the most reliable 25% of the data, it is about half/half.
    A person might hear a Hum of 64 Hz in a small Upstate NY city and travel 80 miles to a rural farm house and hear the same thing. Does anyone doubt this is an internal source? Or, perhaps someone hears a neighborhood hum in an industrial area, and a whole mess of other folks hear the similar thing. Does anyone not suspect this is an external source? Are not both, taken separately, likely correct?
    What I am urging is a recognition of at least two basic categories of hum-source, and, also urging diligent consideration of the particular situation in which any person experiences a hum.

  34. Keith Hamlyn says:


    I would agree with all of what you have written – but with one exception. I believe that externally-generated Noise can be experienced in more than one place. Whether it is the same Noise or an identical Noise generated by a different source is another matter. For the hearer, the Noise may sound the same and therefore be considered to be the same.

    We went to visit some friends a couple of hours drive away and heard a Noise that appeared to be identical to the one at home. Categorically, this is external acoustic Noise in both cases. The same Noise was in our friends house, probably generated by their solar panels -we don’t know, but it sounded the same. We don’t have solar panels on our roof, incidentally.

    Best regards,

    • J.O. says:

      Interesting thought on solar panels. I installed a 5 kW system on a barn structure near my home in Dec. of 2016. And I very much heard the hum that winter (and also last winter 17/18). But I also heard it in 2014/15 winter when we had no solar panels. Also I could only faintly hear the hum outside near the barn, but very loud in my home.

      • Keith Hamlyn says:


        I probably used the term “solar panel” rather loosely and expect to get picked up on it! The problem probably comes from the inverter that turns the stored electricity in to a usable ac voltage. I have one that I use when I work with Raynet, the radio amateur emergency network. We provide communications in all sorts of situations and sometimes we need 240 volts ac, rather than 12 volts dc. The waveform form the inverter shows that the dc is not smooth, but contains some spikes. You could look down that line to confirm that your ac voltage is clean. Cleaning it is pretty straightforward and well known.

        Best regards,

      • J.O. What pitch did you hear and what is the frequency (50 Hz or 60 Hz) of your power system? Thanks. – Bernie

      • J.O. says:

        Using the tone generator I matched most closely with 54 Hz on the sine wave.
        And 60 Hz on the solar power system.

      • J.O. said AUGUST 8, 2018 AT 8:28 PM “Using the tone generator I matched most closely with 54 Hz on the sine wave. And 60 Hz on the solar power system.”

        You lost me??? Is the 54 Hz match what you heard after the solar was installed AS WELL AS BEFORE the installation? If it is the same, the solar is unlikely to be a factor at all. If this (hum heard before installation) were not so, the manner in which power is now (presumably) sent barn-to-house (possibly overhead lines) would be of interest.

        What did you match to as being 60 Hz? Is there a second hum?

        You didn’t answer as to what your power frequency is. I assume 60 Hz?

        Thanks for any additional information.

        – Bernie

    • Keith (at Aug. 7, 2018 10:23 PM)

      Since your at-home hum is probably 100 Hz (you never say for sure, but a spectral chart was posted), it is no surprised that the inverter noise of a friend’s solar panels, while miles away, is the same pitch. In one sense, your hum and your friends came from separate sources (just as they would if his came from a transformer local to him) but both are the same in another sense – as originating with the 50 Hz power grid.

      • J.O. says:

        Allow me to clarify.
        I first heard the Hum in late 2015 and up through spring of 2016.
        We installed solar panels in Dec. of 2016. I again heard the Hum in late 2016 and through spring of 2017.
        Started hearing the Hum again in Dec. of 2017
        About Feb. of 2018 I went on-line to see if there was any info on the Hum because I’d exhausted all sources of detection for a local causes and it was driving me nuts. It was at this time that I attempted to match the pitch of the Hum with the tone generator. And while 54 Hz was closer than 53 or 55 Hz, it was not a perfect match…but it was close. I again stopped hearing the Hum this past April…late in the month when nights got noticeably warmer. There have been a couple times these past three months when I thought I could faintly detect it, but as I do not want to hear it, I quickly stopped focusing on it. And have had some peace for the last 3 months.

        And yes, our home operates on 60 cycles/sec AC electricity. The solar panels have invertors on them that take the power from DC to AC prior to being piped into our electrical service panel. Because I heard the Hum before installing solar, I have largely ruled that out. With that said, there are two homes within 200 meters of our home that also have solar power and both in existence prior to 2015.

        In my opinion, one factor that may help us find a cause for this phenomena is to look for commonalities for those of us who can hear the Hum. Why Us? Why only 2% of the population? What traits, environmental factors, medications, etc do we possibly share? I believe there is a good chance that there is indeed some link.

      • J.O. commented AUGUST 9, 2018 AT 12:24 PM IN PART – THANKS:

        “. . . . Because I heard the Hum before installing solar, I have largely ruled that out. . . . .”

        Your conclusion seems correct. Also your ID of pitch as 54 Hz (not electrical), hearing it more in cooler weather, and (as far as I can see) your NOT having mentioned any others nearby as also hearing your hum (?) marginally suggests an internally sourced phenomenon.

        I infer that you don’t mind doing research so what happens if you try the first 7 test in my checklist?
        http://electronotes.netfirms.com/ENWN53.pdf (Test 8 could be inconvenient!)

        J.O. also said “. . . . . . Why Us? Why only 2% of the population?. .. . .”
        I would wager there are innumerable similar afflictions!

        – Bernie

      • J.O. says:

        Bernie, you are correct. I asked everyone who came to my house to listen for the hum. Out of about 9 people, the closest I got was my youngest son (28) who said, “Maybe…but very faintly”. And in my head / ears (and sometimes my whole body felt like it was vibrating) it was ever-present, loud and driving me nearly crazy.

        On your form questions, it would be pointless for me to try now as I’m not currently not hearing it. If it comes back, I will indeed go through the questions and get back with my answers.

        And I’ll add something else here, I have significant hearing loss at higher frequencies…I cannot even hear crickets unless they are within just a few feet of me. But in a Jan. 2016 Audiology exam the audiologist said to me, “You have remarkable hearing at low frequencies, much above average.” And I prove this constantly to my wife when we’ll be watching the television and I’ll suddenly get up and look out the window because I’ve heard the late arriving UPS truck or my son coming back with our work trailer from about 1/3 mile away when they turn the corner onto our dead-end street. I’m sure I could obtain these records if Glen thinks they might be useful.

        In the meantime, if any HUM sufferer could find their way to the ‘anechoic chamber’ at Orfield Laboratories in South Minneapolis it might help to rule out an external cause. The articles on this room claim that the record for staying in this room is 45 min. It is so quiet that people begin to hallucinate after a time. If several Hum-people could go there..and their observations matched, it could be a big leap forward in understanding the internal vs external question.


      • J.O. says:

        Here is a youtube video of this quiet chamber. Apparently it is NOT open to the public so Glen or Bernie would have to pave the way for volunteers using their credentials.

        Listen to what the reporter says at 4:45 seconds on the youtube video time (not the displayed time). It WILL get your attention.

      • Regular readers of this blog will be familiar with this; I posted about this facility several months ago. At that time – at least in the article I read – apparently members of the public were welcome. Let’s get the most recent word on that.

      • Keith Hamlyn says:


        Living in the UK, as you are well aware, our mains power runs at 240 volts 50Hz. The Noise that we hear is predominantly 100Hz with lesser levels of 200Hz and 300Hz. With these higher frequencies, the Noise is not a pure tone. Without an analysis of our friend’s Noise, there is no certainty that they are identical, although your premise that they are generated in a similar manner is probably about right.

        The big question at the moment is why the Noise should still be there in a power outage, even if it is travelling longitudinally as an audio signal. The distance and the number of joints/points of tethering to posts would seem to militate against it somehow. Locating the source is truly difficult.


  35. Lisa Allen says:

    Bernie or anyone else, do you think there is any benefit in seeing a neurologist or neurotologist (sp?) to help answer that question, “why us?” Has anyone else here done that yet?

    • It is widely reported in the scientific literature that there are not only significant auditory performance variations in the population, but actual anatomical variations as well. Also, there are over the counter drugs and prescription medications that can affect the auditory system. Give me a few hours and I can compile a list of that research, if you’d like. Our latest Hum Map survey probes a number of possible proxy variables for this, ranging from medication use, to family history of certain disorders, and so on. It would certainly do no harm to engage a medical expert on this.

    • Ha!

      Be careful when you ask an engineer for an opinion on doctors! Probably 25 years ago.

      Bernie: “I don’t think the average doctor is any smarter than the average engineer.”

      My student Scott: “Neither do I – I just think the have stronger stomachs!”

  36. Lisa Allen says:

    Glen, thanks, that would be great. I think I’m going to make an appointment to see one. Whether it’s internal or external, it would be nice to learn “why us” and not 98% of the rest of the population, and also, whether anything can be done about it. I will also look at the latest Hum Map survey again.

  37. Lisa Allen says:

    Glen, thank you. I will read these over the next few days.

  38. Lisa Allen says:

    Bernie, I take it you’re not a big fan of doctors!

    • Lisa – Not of average ones anyway! Do you suppose that the average neurologist (or ear doctor) has even ever HEARD OF “THE HUM”? I don’t have much idea about this. I guess I am suggesting ASKING IN DETAIL before investing. In fact (seriously), try to find one who is a Hum hearer.

      In fact, I think I will make a few calls locally. – Bernie

      • Lisa Allen says:

        Bernie, I think it would be hard to find an ENT who is a hum hearer. Maybe if I lived near a big city like New York there would be more of a chance of that but not in Myrtle Beach, SC. And I’ve been to two in my town that didn’t know about the hum, but they do now because I told them about it. I was thinking of seeing someone who is a bit more advanced or specialized in the field, like a Neurotologist in one of the larger cities in the state. It may yield nothing worthwhile but I think it’s worth a try. If anything helpful comes out of it I will let you all know!

      • Thanks Lisa-

        Let’s try a slightly different question: While it might be hard statistically to LOCATE hearing professionals who themselves hear the Hum, they have to exist in fair numbers – so why are they not automatically SHOWING UP here? Any thoughts?

        – Bernie

  39. Lisa Allen says:

    Well, I would first want to know, what percentage of the population are ENTs? Then, what is about 2% of that number? And how big of an area are they practicing in – all of Europe, the USA, Canada, South America, Australia and wherever else the hum is heard. It does seem like there should be SOME that hear the hum, but there are more doctors in larger cities where the hum typically is not heard, so maybe somehow that can be factored in too. Also, after years of many of them dismissively telling people it’s all in their head, maybe they’re a little embarrassed if they start hearing it themselves and realize they should have taken it more seriously as it can cause a great deal of suffering, as they are now learning first hand. And maybe hum hearing ENTs would talk to other ENTs about it and not be inclined to come on a forum like this. Beyond that, I don’t know!

    • Benoit says:


      Regarding ORL, I visited 3 different, the mosts famous of my region.
      After telling them about HUM, they told me that more and more patients claim to hear a low-frequency noise mainly at night.
      They do not understand how with 23,000 hours of service as a sound technician and dj the test of my hearing is 30% higher than the average so that should be the opposite.
      They report a slight loss to 3Khz that I confirmed to + – 3.150 Khz (Frequency that bothers me and I go down every time I set a sound processor)
      They also report a good hearing of low frequencies.
      For acute tinnitus they tell me that this is probably due to my job.
      This is totally unfair because if it were the case, it would be irreversible, but a fasciathérapeuthe makes it disappear after a massage of a specific area in the neck of + -20 minutes.
      Back home, tinnitus is gradually coming back.
      I remain convinced that Hum is an internal phenomenon created by an external phenomenon, an electromagnetic pollution always growing, creating a weak electrocution and consequently a stress at the level of the brainstem causing tension in the muscles of the neck.
      This stress causing various pressures in this zone, increases the general sensitivity: hearing, sinus, sight, cardiac system …
      I also visited a major specialist in physiotherapy who told me: My colleagues and I are confused, more and more patients report pain and stiffness in the neck. We do not find what causes this.
      Glen’s experience in Russia with the Hum returning after 4 days (latency) and for me after 6 hours coming back from a white zone proves that it is after exposure to a powerful and continuous phenomenon that the Hum is coming back.

      The difference between those who hear it or not is a question of duration of exposure to a certain power.


      • Benoit at AUGUST 15, 2018 AT 11:24 AM SAID IN PART:

        “ . . . . . . . The difference between those who hear it or not is a question of duration of exposure to a certain power.” The reference here to “power” seems to be “electromagnetic pollution”. The statement is illogical and contrary to the scientific evidence.

        (1) If the “electromagnetic pollution” were very strong in some geographic regions and not others, why would only certain persons (you, but not others in your home, for example) be affected?

        (2) Benoit is or should be aware that there is good evidence of (generally, air-) travel PER-SE as being responsible for interruptions of the Hum for several days. This phenomenon is reported by Glen and, for example, by Frosch here:

        Click to access possible-joint-involvement-of-the-cochlea-and-semicircular-canals-in-the-perception-of-lowfrequency-tinnitus-also-called-the-hum-o.pdf

        (3) How would the Hum, if caused by “duration” of RF exposure be halted (interrupted) by a vigorous head-shake. How would the head-shake block the RF in the first instance, and a duration of even one second then be enough to turn it back on?

        – Bernie

      • Benoit says:

        Bernie, thank you for that very interesting link.

        Response to the introduction of your comment:
        In the link you mention, it is always written :
        “When we try to determine explanations for the different behaviors of the pairs of dependent features, we must emphasize that SIH, HRH, and TLH are not common knowledge in science, which complicates each observation. The conclusions from this study are therefore hypotheses, for which a match in current scientific evidence may be difficult to find. Due to a lack of data, several reports from reliable single hearer sources are utilized to further discuss on this topic and to gain a better insight into these unusual observations.
        Beats and head rotations”

        This confirms that not all the answers can be found in the scientific literature.
        The fact that Glen could not enter this library is perhaps a sign that one should not waste time looking for the causes of Hum in the distant past, but in the near past.
        I appreciate very much your research, I read carefully your electronotes which enriched my knowledge. Thanks to Glen and the World Hum Map, I learned that the phenomenon is not local but global. Thanks to you, I have saved a considerable amount of time and have been able to eliminate a significant number of cases.

        Response to question 1:
        When I say “electromagnetic pollution”, it can be electric, magnetic and RF fields.
        In my neighbourhood survey, it is strange to note that my close neighbours hear it and that over 75 meters from the transformer no longer hear it (as a reminder, the transformer is 20 meters in front of my neighbour’s house). I conducted my investigation in two other streets of the village and even observation, people who hear Hum live up to 100 meters from the transformer and not beyond.
        For my part, I hear it in all the streets of the village where the population density is important and consequently my village is framed by 5 antennas of telephony of great power.
        In my house the Hum weakens slightly when I spend a night with electricity cut and grounded (1 V/m) in the bedrooms and that I measure a magnetic field of +- 20 nT but it is rather rare. Most often, the average is 35 nT and Hum is at a usual level.
        When electricity goes into night mode, reduced rate, it goes up to 120 nT! During lunch and dinner: 80 nT with overcast sky.
        The closer you are to the transformer, the higher the amperage and therefore the magnetic field is important.
        I also measured in off-peak hours with a sunny sky up to 80 nT, which corresponds to the consumption on the photovoltaic production of some neighbors.
        However, in the neighbouring village located 15 km southwest in the neighbouring valley, there are very few inhabitants, few photovoltaics and only 3 telephone antennas of very low power, the nearest of which is 2 km away. When I get there, after 15 to 30 minutes, the hum disappears and the magnetic field is 1 nT!
        Last week, a friend of mine asked me to measure the electromagnetic fields in his house 15 km northeast in another village. Arrived on the spot in the middle of the day as soon as I got out of the car, I hear the Hum very loud. I’m surprised because I checked, the transformer is 600 meters away. I measure the magnetic field and my device measures 240 nT! All the houses on this street are equipped with photovoltaic panels. As soon as a cloud hides the sun, the field drops to 80 nT!
        I remain convinced that people who have been exposed to electromagnetic fields of a certain intensity for several years are those who hear HUM because the general sensitivity is increased.
        My wife hears Hum too. In my neighbours, both hear him and when only one hears him, the other is not often at home, he works long days away from home. Friends who come home do not hear it because they are not exposed in their home; when asked if they hear a noise, some have noticed pressure in their ears.

        Response to question 2:
        I am well aware Bernie, during my trip to Amentea in Italy last year, no Hum!

        Response to question 3:
        Simply because electromagnetic fields create a weak electrocution that creates stress in the neck muscles. This stress puts pressure on various areas that influence blood flow and other things. The fact that the Hum stops by nodding its head interrupts for a moment the internal audible perception of the phenomenon.
        If you are electrocuted at 230 volts, your muscles stretch all at once, there is significant stress, as soon as the electrocution stops, you still feel a little stress, then sometimes a slight drop in tension and tingling, tembly.
        Do the same experiment by dividing the tension by 10, you feel nothing, on the moment, but after days and weeks, see months the symptoms of electro sensitivity will be felt.


  40. Lisa M. Allen says:

    Benoit, that is interesting that your doctors say more and more people are complaining of noise at night. Do you mind if I ask you what country you are from? That sounds like the hum/noise is becoming more prevalent. My doctor said something similar but more general – that many people complain of hearing noises and it’s all internal. I’d like to find a doctor that’s interested in knowing WHY a small minority hear noises, what external, environmental factors play a part in this and what treatments they recommend if applicable. When you say you have tinnitus are you referring to a high frequency noise or to a low frequency hum? Does getting a neck massage help with the high frequency noise (tinnitus) or low frequency noise (the hum or low frequency tinnitus)? Yesterday I flew to New Jersey to visit some family, and it’s hard to type on my little phone, but when I get back home I’ll finish responding to your post (and hopefully have a little break from the hum too).

    • Benoit says:

      Hello Lisa I live in Belgium, doctors have not received training on environmental factors. For my part I am very Cartesian, I consulted several specialists who understood that it is difficult to make me swallow a treatment until I have the cause of the problem. It does not make sense for your doctor to give you treatment without knowing the cause. When the tension in my neck is higher, my general sensitivity is high and a smell, a sound, a strong light, gluten, lactose can trigger a headache and sometimes a migraine. My only remedy: take 2 caffeinated aspirin. In 15 to 30 minutes, the pain is gone and the HUM falls very low. So my neck relaxes gradually but not completely. So, is it the HUM that increases this phenomenon or phenomenon that increases the HUM? Hard to say but I am convinced that the HUM does not come from a single environmental factor but from the addition of at least two sources. In my village, the minority who hears the HUM lives near transformers, it is also heard in the streets where photovoltaic production is important. I could be wrong, but I think the minority who hears HUM has been exposed to a magnetic field can be in addition to an electric field for several years at a higher dose than those who do not hear it. This increased sensitivity could more easily capture the high frequencies and reproduce a sound vibrating internally by a succession of cascading phenomena.
      As for tinnitus, I speak of a high frequency, low frequency hum is not a tinnitus for me.
      The visit to the fasciatherapist removes tinnitus and HUM!
      Once back home, the two come back but not immediately, as if the electromagnetic pollution took a long time to stress the muscles of the neck. A woman from my village experienced fasciatherapy, HUM and tinnitus came back after a week. From person to person, it changes and I remain convinced that it is a question of difference of power for a certain time.
      Can you try the experience of 2 aspirins containing caffeine? The cataflam also helps, it relaxes the neck and the HUM goes down again.
      It is my pleasure to converse with you when you return.

  41. NairB says:

    I am convinced the hum is the collective geographic spread of refrigerated trucks that act as enormous woofers. I have a local frozen food market a mile from my home and managed to source this low frequence rumble to the delivery trucks at the freezer store. I have also heard the same hum in mre isolated locations outside the city but certain it is the combined refrigerated trucks (especially in the ities) generating this low frequency resonance that can be heard several miles away given the correct atmospheric conditions. The structure of your propery materials can also emphasise the hum acting like a filter.

    What does everyone think?


    • NairB –

      Not unlikely, YOUR personal hum may well be due to refrigerator truck(s). You even indicate that you ”managed to source this low frequence rumble to the delivery trucks at the freezer store.” Congratulations. It would be good if everyone who has strong indications of a real (acoustic) source, as opposed to a low-frequency internal source, went to as much trouble (or perhaps, just had your good luck!) in locating THEIR source. But you really need to refrain from generalizing your personal success, particularly to those who more likely have a more difficult otoacoustic condition.

      – Bernie

      • NairB says:

        Hi Bernie

        Many thanks for that reply and my humble apologies to those who may have otoacoustic conditions. I had no intentions to disregard any theory or anyone regarding this issue. Again I apologise if that seemed the case.

        Like everyone one on else this forum, I am also fascinated by this phenomenon and gave an example of my experience.

        Like I mentioned in my post I still hear the hum at different locations and when I do, I can only rationalise it back to those refrigerated trucks as it is verylow bass tone as captured by varios samples across the globe.

        It still gets on my nerves. Maybe Dr MacPherson could look into this theoryfor us as a process of elimination.

        Kindest regards


      • Benoit says:

        Hi NairB,

        Like you I thought that the Hum were coming from refrigerated units and for my part I thought that it came from the groups located on the roofs of the food stores. I made infrasonic measurements where I measured 84 decibels at 4Hz and studied the phenomenon of harmonics caused by frequency variators. In short, the frequency variators destroy the sinusoidal current and this causes vibrations that gradually destroy the bearings, creating low frequency noises amplified by the fans. It’s noises are almost inaudible but our brain nervous system feels them. I discovered that the neighborhood of this store had the symptoms related to infrasonic pollution.
        But that did not correspond to the global HUM.
        Yes, there are refrigeration units on the roofs of the shops in each village and on the trucks as you mention, but these create a beating that is superimposed on the World Hum. Initially, my sensitivity also brought me to a factory located 5 km from my home, I also thought it was the HUM source. The factory was running 7 days a week and 24 hours a day. The day she stopped, the beating stopped but the HUM was still there, maybe less.
        It was Bernie who taught me to differentiate the beat of the continuous HUM.
        We all have hypotheses, we have to share them here even if we are in error. The HUM is perhaps the addition of two phenomena finally, we have to find which ones.
        Thank you for sharing your experience.


  42. NairB says:

    I am convinced the hum is the collective geographic spread of refrigerated trucks that act as enormous woofers. I have a local frozen food market a mile from my home and managed to source this low frequence rumble to the delivery trucks at the freezer store. I have also heard the same hum in more isolated locations outside the city but certain it is the combined refrigerated trucks (especially in the cities) generating this low frequency resonance that can be heard several miles away given the correct atmospheric conditions. The structure of your propery materials can also emphasise the hum acting like a filter.

    What does everyone think?


  43. Lisa Allen says:

    Hi Benoit, I am back home now and finally settled in. I just reread your post. I can’t take aspirin due to intestinal problems, but if it’s the anti-inflammatory property of aspirin that helps you, I don’t think that is the case for me. I take celebrex which is an anti-inflammatory medication that is supposed to be easier on your gut, and that doesn’t make the Hum go away for me. I have never heard of faciatherapy but I feel anything is worth trying, as long as it won’t hurt me! I agree with you that the hum is from more than one source. Equally interesting to me is why can I hear it and other’s can’t? It’s a two-pronged mystery. That’s why I am going to consult a specialist, to see if he can see if my hair cells are damaged or anything else that is allowing me to hear these noises. My brother thinks it could be the sulfites in wine that have had a long term effect on me. I do drink a couple of glasses of wine at night, and have done so for many years, so I wonder. Only a small percentage of people are effected by sulfites but since it can effect your sinuses, maybe it does have some effect on your ears, too? A friend of his stopped drinking wine and after a month he no longer heard ringing in his ears (tinnitus). That is different then the hum, I know, but it’s still interesting. I started aerating my wine, which helps to remove sulfites, and cut back to one glass of wine. I don’t think that will make the hum go away but it doesn’t hurt to try. Sulfites are also in many foods, too, especially dried fruit. Regarding what you say about the magnetic and electric fields – what creates that and if we are exposed to that, wouldn’t everyone else be, too? I don’t know much about that so I apologize if that’s a dumb question. I 100% agree with your commnt to Nair: “We all have hypotheses, we have to share them here even if we are in error. The HUM is perhaps the addition of two phenomena finally, we have to find which ones.” Amen to that.

    • Benoit says:

      Hi Lisa,

      Too bad you can not test by taking 2 aspirin caffeine, it relieves and attenuates strongly. I tried other medicines without any result ..
      The fasciatherapist is an osteopath specialized in everything related to the head and the neck, he practices a massage of a precise zone in the neck, this zone relaxes and the sensitivity returns to a normal level which remains as long as you return not in the polluted area.
      As I said earlier, those who do not hear it have been less exposed and at a lower power.
      Diet also plays the role of heavy metal accumulation.
      Scientists have found nothing at the cellular level with short-term sensitivity tests.
      I am convinced that everything has happened in the long term.
      It’s not your wine is triggering at the base.
      The source of the HUM creates stress not far from the brainstem that increases your sensitivity and therefore some foods or drinks will trigger a headache, certain smells, lights …
      Take the test, when you hear the HUM, play low power music and then swing your head from side to side, the HUM stops for a moment, not the music.
      This proves that it is internal and that its origin comes from the articulation of the neck.

      • Benoit at AUGUST 25, 2018 AT 4:50 AM said at the end:

        “This proves that it is internal and that its origin comes from the articulation of the neck.”

        I don’t think “proves” is warranted even though the head-shake test does provide STRONG EVIDENCE that a head shake interrupts the Hum, in turn implicating an internal source! But since the exact same interruption occurs by just speaking sharply, grunting, or as Glen has pointed out – a vigorous exhale, the ear and associated hearing mechanisms are implicated (as is much more logical). Nothing special about the neck is even suggested – it is likely the middle- and/or inner-ear. Don’t you think?

  44. Benoit says:

    Hi Bernie,

    Indeed, this does not prove that the root cause is internal.
    If the HUM depended on a single mechanism between a source and a receiver we would have already found the cause.
    I come back to my theory, the HUM is a phenomenon or a succession of external phenomena triggering a series of mechanisms provoking an internal noise.
    It is still interesting to be able to separate after a few minutes or hours in a “white zone” and can strongly reduce it with the intake of two aspirin caffeinated in “polluted area”.
    I read all the comments here for over a year, we all talked about the probable causes, there are dozens.
    Here I share my experience with the goal that others can test a white area not forgetting to take into account the latency but also taking two caffeinated aspirin. With the latter, the HUM disappears after about two hours in polluted area and returns more or less 12 hours later, the headache is disappeared between 15 and 30 minutes, which corresponds to the latency after which the HUM disappears in ” white area “.
    Are there others who can test this and discuss it here?
    It would be very interesting do not you think?

    • What is a “white zone” and how did you assure you were in one?

      I occasionally take asprin and almost daily consume coffee. No change in the Hum.

      What is “the headache” you are talking about?

      Your discussion of “latency” and the associated time intervals is not clear.

      • Benoit says:


        I think I have already explained in another comment, I will express myself here in another way.

        – What is a “white zone” and how are you ensured?

        A white zone is an area where electromagnetic pollution is very low.
        The most interesting of the two white areas that I found in Belgium is in a wood located on a plateau at high altitude.
        At this place, I hear the HUM and after a few minutes (between 15 and 30) (discharge latency) the HUM disappears and the muscles of my neck relax slightly.
        I had already experienced this phenomenon in this area twice before acquiring my measuring devices.
        In June 2018 I came back to this place to take measurements: Electric field: 0 V / m. Magnetic field 1 nT. HF: 0.07 uW / m2.
        In this place, no power cables, phone antennas are small (low population density), the nearest is 2 km away.
        When I return to my home, after a few hours, the HUM returns. Average electric field: 20 V / m. Magnetic: from 15 to 130 nT. HF : from 1 to 20 uW / m2 without wifi (large telephony antenna at 300m) and 150 uW / m2 with wifi which is 3 meters from rest areas (living room, bedroom, kitchen)

        – I sometimes take asprine and consume almost daily coffee. No change in the hum.

        Normal aspirin has no effect, you have to take “caffeinated aspirin” and one of them has no effect, you have to take two. 65 + 65 = 130 mg

        – What is the “headache” you are talking about?

        The phenomenon increases the general sensitivity, look at the common symptoms in the table (HUM questionnaire):
        Hearing discomfort (pain, fullness, beating), headache, insomnia, nausea, sense of vibration, anxiety, hypertension … come back often.
        Any organ (hearing, sinus, sight, …) put in sensitivity will cause a headache if it is too strongly solicited.
        In my home, if I breathe very hard a scented candle or I place my neck very close to the oven in operation (300 nT) I can trigger a headache.
        In white zone, same experience with the candle and no headache!

        The most likely of my assumptions is that muscle stress in the neck is putting pressure on some ducts in this area.
        As if you are pressing a garden hose, it will generate noise and the pressure will decrease.

        – Your discussion of “latency” and associated time intervals is unclear.

        The fact that the HUM is present when arriving in “white zone” proves that it takes a DISCHARGE TIME (latency) for the body to relax.
        The fact that the HUM returns after a while in “polluted area” proves that it takes a LOAD TIME for the body to become stressed.


  45. Benoit –

    Perhaps it is well not to suggest medications for others here. Particularly in terms of the number of pills!

    I had never heard of “caffeinated aspirin” which is not a standard term in the US, apparently. It may be what has been around here for decades under the trade name Anacin, but just one of these pills is aready 400 mg aspirin and 32 mg caffeine. What you mentioned was apparently 65 mg/pill?

    – Bernie

    • Agreed. This site offers no medical advice.

      • Benoit says:

        Ok Glen but the Anacin I do not advertise here 🙂 (humor)

        You’re right, if everyone shares his medicine here we will not get out of it.

        As I said above, I am against treatments and drugs, I prefer to look for the cause of the problem and try to remove it than temporarily hide it.

        But when the headache is strong, and there is no other way …
        I tested a lot of drugs for the headache, just taking one each as an experiment.
        It is still amazing that only caffeinated aspirin cuts the HUM for a few hours for me and my wife.
        None of the others do it.
        I just wanted to share this experience here so that other people can test and give me a positive feedback or not.
        It is only 2 tablets of 650 mg of acetylsalicylic and 65 mg of caffeine.

        The goal here is to ask the right question: If the HUM can be cut for a moment by the caffeinated aspirin, it would be interesting to study what exactly it is.
        This could lead us to understand more about the mechanisms of HUM.

  46. daveymanblog says:

    I have been hearing the hum on and off since about the mid 1990s. It seems to be more prevalent and persistent now, and sometimes louder than others. It’s more noticeable at night. But, one interesting thing I have discovered, is that if an aircraft goes over, a short distance away from where I am, it seems to null out and cancel out the hum temporarily. I to, have also noticed, that if I shake my head, the hum temporarily disappears. Also, if i make a humming sound myself, when I suddenly stop, for a split second the hum isn’t noticeable, and then resumes. Just my own personal experiences with it.

    • Davey –

      It seems evident that you have the traditional (internally generated) Hum – all the right symptoms. Welcome to the club !

      Very good report. -Bernie

      • daveymanblog says:

        But, if I put ear plugs in my ears, it always reduces the sound of the hum. I always sleep with earplugs for this reason. Even though I do have slight higher pitched tinnitus, why do the earplugs, drastically reduce the sound of the lower pitched hum? I also have to add, that I live in an area where salt mining takes place. We used to hear blasts from below the surface many years ago, but then they started using huge grinding machinery. I have heard the hum, about fifteen miles away from where I live. I still find it a nuisance, and it affects my ability to concentrate and read. I feel it is external.

      • Davey said originally: “….. that if I shake my head, the hum temporarily disappears …..”

        You of course don’t suppose that your shaking your head interrups an underground grinding machine. Also, of courses, if you do have a traditional Hum, any environmental hum (everyone hears) should be superimposed, and one would expect that to be reduced by earplugs. I myself reported hearing a fan at a Golf Clubhouse across the street one evening and being confused.

        You also did use the word “We” so do others at your home hear one or more hums? Also, what pitch do you match your hum to?

        Thanks. – Bernie

      • daveymanblog says:

        At the time when we heard the underground blasting, it was me and my parents living at the house, and they heard the blast too. It was muffled and almost certainly from the salt mines twice a day. Also, at that time, there was no hum. It is entirely possible, that the hum I now hear, could very well be from the salt mines grinding equipment. I hear it as low pitched, and sometimes detect a slight vibration from it. It just feels as if it is an external sound. My own tinnitus, is very different. That is higher pitched, and I can only say, that it feels internally generated. Also, the hum sound, has a slight oscillation about it. My own ideas are that it could be salt mines, mobile phone masts, nearby railway lines, haarp weather technology, gas pipelines… I could go on, but I really feel it is an external cause. The other point I have to make, is that I mainly detect in indoors, and when it was very bad at one time, I listened outside and could hear it, but only extremely faintly, after listening very hard. Whatever it is, I just think of it as a very strange, but irritating phenomenon.

  47. J.O. says:

    Your experience matches mine very closely Daveyman (except for the salt mine issue) with regards to inside vs. outside, slight vibration, Etc. I too have high pitched tinnitus at times and can tell it comes from within my head or auditory “equipment”. And I also believe this low pitched hum is externally generated mostly because for 3 years running I only hear it in the cold weather months. If it was internal, the air temp’ would make zero difference. But pretty quick someone is likely to start shouting “YOUR HUM” might be different than other people’s hum. The general consensus on this forum leans towards internal.

    • daveymanblog says:

      I know that the consensus leans to internal, but I strongly believe that it is an external source. However, I am no scientist or doctor, but it could be that something externally is interacting with either something in the brain or auditory system to produce the effect. Possibly the reason why some people hear it and others don’t, could be due to variations in an individuals hearing system, making some people more prone to hearing it.

    • J.O. said: ” ….The general consensus on this forum leans towards internal.”

      Glen – is this true?

      My view is that many people are “hearing” something internally generated (a traditional Hum) for which we are still far from understanding. Ohers are actually hearing a real sound (power substation, pump, salt mine grinding, etc.) which should be identifiable (MANY have been). It is counter-productive to insist that there are not at least two camps here.

      Click to access ENWN56.pdf

      The fundamenatal first step is to investigate the particular circumstances of each individual. MUCH progress has been made in achieving this separation of categories – IF the individuals involved take the time and effort to do so, while respecting the usual procedures of scientific inquiry.

      – Bernie

      • I heard nobody proscribe multiple camps. Indeed, there could be more than two. When the writer wrote, “leans toward internal”, I tend to agree, but I think it’s crucial to note that a sizable percentage of people who complain about low-frequency noise complaints are not hearing the Worldwide Hum. Henrik and Bernie have both invested much time in helping people separate those out. With that in place, the four theories I included for consideration simply seem reasonable, and I am investigating them in turn. I don’t think the horse-race approach to theories accomplishes much. In fact, it can be counterproductive. Some readers will be aware of a person on the East Coast who has crusaded relentlessly and loudly for many years, wearing down and convincing some people that high-pressure gas pipelines are the source of the Hum. His mistake is to not consider what I wrote above regarding multiple sources of hums. I sympathize with people suffering from noise (whatever the source), but once external sources have been found, things change from a scientific investigation into a political and policy campaign. As to the World Hum, I’d rather that people work on advocacy and promoting investigation by serious laboratories and medical research facilities.

    • J.O. said: “. . . . . If it was internal, the air temp’ would make zero difference. . . . . .”

      When it gets cold outside, many of us close our windows. This greatly reduces distsracting environmental noise (much as it is also reduced at night) and we hear an internal Hum relatively more strongly (for those of us in the “internal” Hum camp). You often can’t take any one factor in isolation.

  48. Ian heydt says:

    I’ve noticed that this does not seem to be happening in Russia. It seems that only us and nato territories are being hit with these events. Cause for concern?

  49. Lisa Allen says:

    Maybe knowledge of English isn’t as prevalent in Russia, so they don’t report it? I don’t know; that’s just a guess.

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