I am trying to hook up an MTX Amp with my Alpine 7894. I've got a '97 Intrepid with 6 Speakers (2 FDash, 2 FDoor, 2 RDeck). The Amp is a 4Ch RT4280X that I have hooked to the front door and rear deck speakers. The problem is that the radio tunner works fine, but the CD player doesn't deliver sound unless I go the Setup section and toggle the power (PCI) off and back on. After a while, the sound cuts out and I have to toggle again. I don't get it.