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Is/was the stock head unit handling power for the 6X9's and the stock front?
Being as the sound is coming from all four speakers at once, I'd at least check over stock connections for the head unit, including system ground...and I wouldn't be at all surprised to find a shakey +12V (check ACC, if that's what you were using to remote your aftermarket amp) wire or loose speaker connection. That, and a dusty potentiometer (volume knob internals) or other internal dust can cause that kind of noise in all speakers...
Last edited by hithere : 03-17-2008 at 09:02 AM.
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