A friend cued me into this article: https://www.audioholics.com/audio-amplifier/ftc-consumer-audio And I took a read and posted some comments. I think its a really interesting article, but not because of the FTC portion of the issue. Namely, I think amplifier ratings/specs are a problem generally. First, I don't think the average consumer understands those specs all that well, and I think manufacturers take advantage of that. Second, I think new amplifiers, namely Class D amplifiers, have changed things a bit. These things oscillate, on purpose. That isn't a problem, but the filter (or lack there of) can create problems on the output. It doesn't always filter all the noise out (well ok, it never really does). They have higher distortion at high frequencies than other amplifier types, and sometimes its problematically so. They rely on assumptions about the speakers that can make them a bad match for speakers that are not particularly reactive, such as planar drivers, air-motion tweeters, etc. For example a filterless sigma-delta modulated Class D amplifier and a direct connection to an air-motion tweeter with nothing more than a resistor and capacitor may not be very good friends. Now more than ever, manufacturers are starting to fool around with all of this. Gene calls out Onkyo for their newly inflated amplifier specs, which have actually been noted as illegal (apparently they have been reported to the FTC). With Class D amplifiers becoming more popular I also expect to see more of this, as it isn't hard to design an amplifier that might measure as 50 watts per channel in a full bandwidth all channels driven scenario and 100 watts as a single channel at 1khz. Further many companies are playing terrible games with the impedance in question, testing at 6 ohms was common, but I've now seen some amps show only specs into 4 ohms, 2 ohms, etc. Numbers that aren't of much use to most consumers with more typical speakers.