ok so update. hooked up the amp and the CVR that was making noise, turned the amp to FULL/Mono LPF on deck was tryed in all three options, 80/120/160. The sub is no longer making the noise, the RCA cables were not damaged. no gains were turned on, LPF and HPF on amp were turned down all the way, no music/vocals from sub, just bass. but it sounded like ***. wasnt in my box, had my buddy bring his old box for a single 12 over which was also sealed at 1.5cuft. a little smaller than mine. Wouldnt pick up the songs like it used to, just sounded terrible.. where to go from here?