Oh, I totally agree that a watt is not the end-alll comparison factor on how loud a system will be. The big amp in the system I was talking about was tested (by the manufacturer of course) at 748 watts. That's on a bench, with a resistor, not a speaker, from what I understand. The others were around 200-ish each. Then you have to add in the efficiency of the amp. The big amp was a class d (subwoofer) which is very efficient, not worth a damn with higher frequencies. The others were class AB which are around 60% efficient, IIRC. So, at 12.6 volts, we're probably getting close to 100+ amps going in. I have heard systems that are far lower wattage that are louder. Where the big amounts of power reall comes into play, is in control of the speaker cone of the woofers, more critical in some cabinet designs than others.