Hey guys... I just recieved my epic 80/350 and just got done hoooking it up.. everything sounds great except for my sub. There is this low freq. buzz coming from it. The buzzing starts to fade away as a turn the volume down on the back of the amp. But it comes back when its halfway turned up. Its not the ground hum because I had that problem to and i solved it by taking out the screw. Anyone know what the problem maybe? Seems like a simple problem.