I've owned two of the Rockford Punch series amps, the P3001 and P4002, and they were both great. The P4002, said to be 400 watts rms, came with a birthsheet that said 582 RMS at 4 ohms bridged. So they DO put out more power than you'd expect. They run a little too expensive for my taste though, compared to some amps you could get online for cheaper (hifonics).