Very low-pitched continuous drone. Pitch rises and falls slightly but can remain steady at times. Inaudible to my wife. Reminiscent of the hum from a large transformer/sub station but there is none close by. Unable to hear outside. Worse upstairs at front of house. Sound still audible at night with all power turned off so ruled out computer hardware and audio/visual equipment as possible source. Wearing earplugs has slight reduction but sound still present. Could it be caused by mobile (cell) phone masts?
What they reported
First noticed: 2015
Pitch: 100Hz triangle briefly falling to 80Hz; very low volume
Loudest: During the night
Where: Indoors
Symptoms: Insomnia
Changes with weather: More noticeable during calm weather as wind noise masks the hum.
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the accounts read alike, found by meaning rather than by shared details
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Anomaly