Bruce, both the 6x120(1KHz)(6x100,20-20KHz)and the 400 numbers are accurate, but they're not referring to comparable rating factors. The 400 watts is power consumption(not "total system amplification"),and except where the manufacturer states that it's "maximum" or "full-power" consumption it's a figure that roughly corresponds to average consumption and is arrived at in the UL required testing at 1/8th power for overheating. A class AB amplifier is about 50% efficient(power output compared to power consumption)at full rated power, but the efficiency is lower at less than full power and might be roughly 20% at 1/8th power. 1/8th of 6x100 is a bit under 80 watts, and at about 20% efficiency that would require about 400 watts of consumption. So there's no conflict between the two figures. Buy it if you want it; the power rating has to be accurate, as required by the FTC regs.
