I recently got a kicker ZX s1500.1 on a trade. It was a really good deal....had it worked. I found out when I got home and hooked it up that it wouldn't play music. I rechecked everything and it was set up right. I hooked a DMM to the speaker terminals on the amp and it reads 17v with no RCA cables plugged in. It sounds like a MOSFET clicking on and off fast really quietly. Any ideas. Nothing appears burnt.