I would like to put a small amplifier in a small subwoofer box. The obvious concern is over heating. Its a sealed box. But the box (from Rockford Fosgate) origanily had an amp inside of it. And the rest of my system has a pre-amp as well. I also have an RZR and that stereo system is again, pre-amped. So what kind of amp can I buy to push my 10" Rockford Fosgate sub that I can put inside the enclosure?