does it make the sound when you switch tracks as well?
i had issue like that and ground was my solution. have you done big3 yet?

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Hifonics BXI2006 (2000W @ 1ohm ) Alpine SWR-1542 Type R's in 4cube sealed box
1997 Ford Thunderbird v8 4.6L SCT Tuned @ 15.47sec 1/4 sitting on 20inch TIS 01's