Weird Kenwood KDC-MP732 Problem

[Jaice 10+ year member]

The problem started a few months ago when I installed a Memphis 1000PR and 2 Memphis PR 12s, I noticed when I turn the volume up, it started making this weird distorting sound, when I unpluged one of the RCA's I didn't have a problem. I later installed 2 Kicker CVX 12s same amp, didn't touch anything, no problem. Today I installed my Kicker ZX1500, only used 1 rca, no problem. I decided to replace the RCA's, problem seemling got worse, even when using 1 RCA now. The RCA's are gounded to remove the ground noise since the first system above. The other RCA outs on the deck work fine.(Front and Rear) Sounds to me like it would have to be the deck since everything was replaced. Any thoughts,Thanks

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[matrxx dude 5,000+ posts]

how did you ground the rca's