I am useing an sony xm-504z 4 channel amp and have two 12'' sony xplod 1000 peak subs... x-plod subs.. in the instructions it says it can be used as an bridging amp but when I hook the speakers up it works great for a minute or two then the amp cuts out.. why cant i bridge it with out it cutting out ..? oh yeah it's a 500 watt amp too I don't know what I'm doing wrong that it cuts out am i short curicting the speakers and if so how am i doing it ...