I've just installed a new pioneer 4950 CD player in my 450 SLC and Im not getting anything out of the speakers. Im running direct from the head unit to the speakers- no amps. I must admit that initially I had the front speakers + & - wires hooked up the wrong way around. I reversed them and the unit worked. sounded great. But I returned the next day to complete the speaker instalation and I've now got nothing. The unit itself works, plays CDs but Im just not getting anything out of the speakers....not a crackle.. Ive checked all the wiring (from the harness and speakers) over 500 times and cant find a fault, I replaced the 10a fuse in the head unit and still nothing. Did I stuff the inbuilt amp by having the speakers hooked up the wrong way? any suggestions?