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Are your power and signals wires running down the same side of the car? Separate any power wire from RCA.... try changing your grounds, run a reference ground from the deck to the amps, get rid of your fused distribution block and split with a regular unfused distribution block - just fuse the main supply line running front to back - add up the amperage of both amps draw and place appropriate fuse inline in fuse holder under the hood.
Sounds like a ground loop to me... try any or all of the above and see if it resolves the issue... you can get ground loop isolators but they're more of a bandage rather than fixing the problem.
Hope this helps,
Nick
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