A low hz hum that changes tone sort of a high/low switching. (minor hi low change) Only when it is real quiet. Usually morning in bed. I have heard it outside the home too. Regarding effort to find source. A lot of effort until household sounds were cleared and I noticed it outdoors. Then I chalked it up to 60 hz power lines.
What they reported
First noticed: 2014
Pitch: Could never really match it. trianle and sine wave most resembled it inthe ranges I could hear but sine wave dropped out at 65hz or soseems to be in the 20-35 range by tone, but the style doesn't seem to match.
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Possibly like the vibrational noise of a transformer. As a kid I had a Lionel model train. The sound I hear is quite like the noise from the transformer that powered the model train - but in…
Low pitch hum line a large diesel engine idling I first noticed this around 12/23 or 12/24 2023, this is different from the "Windsor Hum", that stopped when the zug island blast furnace was …
both described a low hum · 65 km away
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.
Anomaly