i've got a pioneer deck and the other day i was driving and the sound shut off...........deck still works perfectly just the sound quit. took the deck out and started checking wires, everything perfect. then started disconnecting speakers to see if a short and low and behold........i un-did the right rear negative and all but that one works now. ya'll think i just have a short somewhere? also my back left speaker cracks like a bish, took it out and reconnected it and worked good, put it back in cracks again, so just a bad connection? thanks in advance...