So at the moment I have a Yamaha rx-v371 as my main reciever with the coax subwoofer out going to a Pyle pta-1000. From there I have that one channel hooked into the Polk car sub. the Polk is a DXI 1240dvc and rated for 360 watts rms and 720 watt peak at 4 ohms. The Pyle will send out 500 Watts at 4 ohms. So to recap: Yamaha > Pyle > Polk. Im wondering why my 8" Pioneer SW-8MK2 hits almost twice as hard (if not more than) as the Polk that is rated for over 3x the wattage at the same ohms. I tested it with the same songs with the same setups. Thanks!