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It's just a thought, but when I used to do quite a bit of sound system stuff we would occasionally pick up some strange interference noises.
I would first check the polarity on the speakers (all of them) occasionally that can caues some strange interfernce noises. Also check the grounding for the amp / power supply. AC harmonics will sound off through the speakers at different frequences. Unless you are running shielded speaker wire check that none of the speaker wires are running too close to an AC circuit while you are at it. Other than that it could be something not quite right in the amp itself, but thats not too common.
JD
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