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not that it woudl be easy to try at all i wonder if your 4 channel is causin interference maybe try hooking a test speaker straight to the high level output from the radio and not use the amps at all and see what happens otherwise looks like an issue with the radio to me
well i will tell you that you are not the only one and that its not your radio because i noticed the same thing when i put my JVC KD-NX5000 in. Since it has a 40G hard drive, i just listen to my stored music more than the radio now. I would love to see who chimes in with a solution.