Bernard, possibly whatever discussion you're referring to got a bit tangled-up in terminology, but the FTC rating uses the RMS average power measurement standard. RMS(root mean square)is just the mathematical process(square the values, add them and take their simple average, take the square root of that average)used to define average power, it has nothing to do with the number of channels being driven. As we discussed before, under the FTC reg unless unless more is specified by the manufacturer, it's understood that the rating means 2 channels driven simultaneously at the full rated power for at least 5 continuous minutes. Some manufacturers choose to use an all channels driven FTC rating, but in all cases the rating of an amp sold or advertised in the U.S. has to satisfy the FTC reg.
