Anomalylow vibration at around 50-60hz I have tried to record the sound. I tested that the microphone could pick up 50Hz tones and had a flat response from 20Hz. There does seem to be something there but it requires much amplification and equalization. It feels louder to me and I am surprised that it is so hard to pick up on a microphone.
DA99AJ · 2018-12-10 · from the WORLDHUMMAP archive
An account in DA99AJ
What they reported
First noticed: 2018
Pitch: 57Hz
Loudest: During the night
Where: Indoors
Symptoms: Insomnia, Anxiety
Changes with weather: Not that I have noticed.
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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.