i have a quantum audio qs1500d it has some scratches and it has 750 rms at 1 ohm,625 rms @ 2 ohm,350 rms @ 4 ohm.... and it doesnt have enought power for my subs......but still it is very loud i like the amp but i need more power and i would like to trade it and cash for a 1200-1500 rms @ .5 ohm amp