im successfully put a 400 watt amp in my car. The pwer light is green and everything seems to be working getting the amp on. Now i am trying to hook my subwoofers up to my amp... I put my wires in.. positive with positive and negative with negative from my amp to subs... i have an rca cable running from my reciever to my amp but there is still no sound coming from the subwoofers! I think i have checked everything that i can think of... is it something to do with the cables from m reciever to my amp? Any suggestions on what could be wrong would help