Crunchy has it right mate. You can't connect all channels in series then in parallel because the first 2 channels are running off the same rca input (being left or right channel) and the other 2 channels off the other, there would be conflicting channels polarity wise and the amp would short and cut out. The sub should work off 2 channels bridge with no problems. Like i said get yourself a multimeter, stick it on ohms range to check the sub, if it reads 3-5ohms the subs fine and your amps stuffed. If you don't have a meter disconnect the subs completly from the amp and leave the rca's plugged in, and just drive around for a bit then check if it's cut out or warmed up, if it has your amp has an internal short, throw it away. A common problem might also be your earthing. Be sure it's connected securly to the chassie via a large bolt and that the paint between the bolt and crimp are clean.
Good Luck
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