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Message: <blockquote data-quote="WheresTheButta" data-source="post: 6891102" data-attributes="member: 559748">Just to sum:   you get no noise when ONLY chan 1 &amp; 2 are plugged in, but when chan 3 &amp; 4 are plugged in, you get noise.   This *only* happens when using the rcas from the head unit, and it doesn't matter which set of rcas you use - they both generate the same effect.    If you plug RCA cables directly from the amp's output to the chan 3 &amp; 4 input, there is no noise.    You already have both sets of rcas grounded to the H/U and you have the H/U grounded to the amp ground.Do I have that all correct?</blockquote>

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