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usb not working

  1. New install, radio sounds good, USB & BT sound muffled

    Technical & Advanced Car Audio Discussion
    Hope someone can help. Installed new Sony xplod head unit, amp, and sub. Also purchased wiring harness to go with existing dodge ram infinity system. Radio sounds great, but if I put in a CD, hook up my ipod with the USB port, or try bluetooth audio, the sound is extremely muffled. Thoughts...