1. C

    Hum in second 4 channel RCA input only on multiple amp system

    I have a problem and cannot find a good answer/way on how to fix it. I am running an Alpine CDE-W265BT HU, 4 channel amp to two pairs of Polk component speakers, one channel amp to Polk 12"sub. Both amps are being fed from HU through RCAs and right side of vehicle. Amp power cords are on left...