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Message: <blockquote data-quote="thatsgonnahurt" data-source="post: 2127450" data-attributes="member: 568918">what you're describing is loop area noise. when all four channels are connected a large loop occurs between the channels allowing noise on the chassis to easily couple into the signal path. this is a situation where twisted pair cables excel over coaxial. by twisting all of the conductors together you reduce the loop area and lesson the pick-up of noise.i agree with squeak, do the mute test. make muting plugs by shorting the leads of a male rca plug. make one for each input on your amp. if the noise goes away your amp and all wiring, crossovers and speakers are fine. next move the headunit on top of the amp using short rca cables or male-to-male gender changers. if the noise is not present this points to the interconnect cables being the problem. use twisted pair cabling.</blockquote>

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