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I've experienced this. It's not tinnitus which is high pitched - this is low pitched. I could hear it best in a certain room, but not when I stuck my head out

I've experienced this. It's not tinnitus which is high pitched - this is low pitched. I could hear it best in a certain room, but not when I stuck my head out the window. It occurred over a period when the nearby overground tube line was being worked on. So I concluded it's industrial machinery causing low frequency vibrations which reverberate in certain acoustic configurations. And it's very, very annoying.

personZ 12y ago
reverberate in certain acoustic configurations This is a very important point. Low frequency noises can have a wavelength exactly the size of common rooms, yielding an unbearable amplification as the waves gang up with common peaks and troughs. http://www.bobgolds.com/Mode/RoomModes.htm http://www.bobgolds.com/Mode/RoomModes.htm