bobthedog
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bobthedog's post in 440 hum. What am I hearing? was marked as the answer
I'm not an expert but it sounds like something resonating in the room rather than room resonance.
I have heard a similar problem in a room with a desk with hollow metal desk legs, this was fixed fixed by filling them up with concrete!
Loop some guitar that causes the issue and move around the room trying to listen for where it might be coming from.