Ok its a stock EL ghia sound system aside from four pioneer speakers, the problem si this when ever i listen to a cd the left hand side front speaker and rear speaker dont work but switch it to the radio and all work fine. Some times when on cd mode the speakers will drop in and out but most of the time they just dont work, ive check all connections to the amp and to the speakers and all are ok. cna any one surgest something?

Michael