ok heres the deal. i have a 600 W. Jenson LXA amp hooked up to two 18 inch 800W max subs. i have the amp set on the low pass filter and the bass boost is on and i bridged the connections (A+ B- for right, C+ D- for left). i dont know if this really matters but my head unit (sony Xtreem) is giving out 54X4. my amp keeps shorting out after around 30 seconds unless i keep the volume set way low . it may be because i twisted the left and right wires together (+to+, -to-) into one connector . i am thinking about just hooking up one side (left or right) and bridging it as A+ D-, i dont know what this will do but i will try anything at this point. my school is having a bump-off to see who has the best system. please respond ASAP if you have any suggestions or if you know anything about amps. thank you for your help.