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mk  ·  3293 days ago  ·  link  ·    ·  parent  ·  post: The Hum

Yeah, I have no clue about the scientific validity of the hum. I just stumbled upon it last night.

Since it is most often heard indoors, I agree it often probably has something to do with resonance and harmonics of the resonance frequency. There's likely a number of scenarios that can lead to a similar effect.