We have recently moved into a new house that has 6 zones or rooms with two in-ceiling speakers in each room. I have sound but in most rooms (I think 5) only one of the speakers will produce sound. I removed the speakers from one room, switched them and have found out is it not the speaker but the wiring. Speakers are powered by an amp, could the wires be connected wrong on the back of the amp? Could the wiring be damaged somewhere in the ceiling? How is the best way to find out? Could there be another problem?