I would check over all of the wiring... what kind of amp? how much power? and what are you pushing with it? also i would turn the gain and the boost all the way down. turn car on and check to see if the amp is in protect mode
its a crappy pyle dryver. but its the only amp i have right now and i dont have enough money for a new one. i just got an 18" btl and i cant even hear it.