I have owned a KSW 15" sub and had no problems until recently. At first it would cut in and out, but now it won't produce any noise at all. I thought that maybe my receiver or possibly the output port for the subwoofer was broken, so I setup the sub where the right and left speaker wire is sent through the sub first. This didn't fix the problem, so at this point I'm pretty certain it's the sub itself that is broken, but have no idea what the problem actually is (fried amp, loose internal wiring, busted sub). Anyone have any input for me?