Author Topic: The Hum  (Read 3755 times)

DrCharles

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The Hum
« on: November 17, 2010, 04:22:27 PM »
Can anyone help me in dealing with "The Hum"...

http://en.wikipedia.org/wiki/The_Hum
http://skeptoid.com/episodes/4090
http://www.milieuziektes.nl/ELF/KokomoHumFinalReport.pdf

I never heard (no pun intended) of it before but unfortunately am now experiencing it firsthand in this otherwise very quiet rural area. I first became aware of it a couple of months ago after living in this house for 2 years (and across the road for 6 more).

It follows nearly all the characteristics described in the Wiki article and it is definitely NOT tinnitus or otherwise internally generated by my ears. And I can hear it at several locations 1-2 miles from my house but can't localize it.

DrCharles

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Re: The Hum
« Reply #1 on: November 17, 2010, 04:28:07 PM »
Using an audio source and a woofer I can pitch-match the irregular rumble/throb to approximately 93 Hz peak. I don't have a sufficiently sensitive mike to use my HP 3580A audio spectrum analyzer though... Bruel&Kjaer make nice ones but you'd better be sitting down when seeing the price! Driving around the area, I can hear it when I shut off the car and open the windows at distances over two miles from the house. There is no one place it gets louder so I am really having trouble localizing a source!

It is audible even with the furnace blower running (directly underneath the bedroom), with a HEPA filter going (which is higher-pitched noise), and with my CPAP on. Nothing else generates that frequency it seems. This is really bugging me, as you might imagine, much like a dripping faucet does.


DrCharles

  • Guest
Re: The Hum
« Reply #2 on: November 17, 2010, 04:33:24 PM »
(continued)
And I can hear the hum at several locations 1-2 miles from my house but can't localize it. Around here the ambient noise level is very low and car/truck traffic on the paved highways is clearly audible outside but not inside. (Closest 2-lane is over 1 mile away, four-lane US 63 is in town 6+ mi.) This sound is definitely not traffic and in any case would not be continuous 24/7 as this rural area really shuts down late at night. I can hear the occasional train whistle; tracks also in town 7 mi away, when standing outside. Nearest neighbor is 1/4 mile away through woods.

DrCharles

  • Guest
Re: The Hum
« Reply #3 on: November 17, 2010, 04:37:56 PM »
(continued)
Soundproofing the bedroom may be the only option since I can't locate the source and in any case the noise is well below any enforceable ordinance. I estimate it's in the 20-30 dB range. Earplugs won't do much good below 100 Hz. But soundproofing materials are very expensive (lead-backed drywall, for example, is over $200 per sheet, and good noise-reduction windows are high-dollar too), so I don't want to invest unless I'm sure it will help.

Any thoughts?
thanks
-Charles

Randy S

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Re: The Hum
« Reply #4 on: November 17, 2010, 04:59:29 PM »
sounds to me like your experiencing the HUM heard around the world!
Give me a call and we can discuss locating the culprit if possible.

760-752-3030 ext 104
Randy Sieg

Super Soundproofing Co
www.soundproofing.org
888-942-7723
Ph. 760-752-3030
Fax.760-752-3040

DrCharles

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Re: The Hum
« Reply #5 on: November 30, 2010, 07:08:39 PM »
Thanks very much to Randy, who recently spent a considerable amount of time on the phone with me, detailing the options, costs and possibility of success. Unfortunately I probably won't be able to invest that much and the house is poorly built so the job would be even more expensive  :-X

However, I left town for the Thanksgiving holiday and upon returning last night, there is no hum to be heard! Nor this morning either! I suspect that the Hum is indeed from an industrial source, as factories frequently close down for maintenance (for 1-2 weeks when there is already a four-day weekend for most employees).

I'll go over today to the sawmill with the huge rumbling furnace, 3.5 miles away, and listen... I'd lay odds it's not running. Oh well, in the meantime I'm enjoying the silence that I always used to have. While it lasts.  ::)