Each of the four Infinity speakers are being powered by one of four channels off a Kicker 370 watt rms amp--each speaker receiving 92.5 watts rms (they are rated at 90 watts rms). Everything is wired properly and installed correctly (i'm using the Dynamatt door kit and 3/4" MDF for mounting plates. They're set to 80hz. Obviously, no power from the head unit's amp is being used. So, with that said, I would have to agree with the other people who posted in saying that 5 1/4" Infinity speakers suck.