I believe the subject at the time was car audio amps, I't doesn't matter because this ruling is so useless it might as well not even be here.
Here is the FTC rule on
Home audio equipment:
http://www.ftc.gov/os/2000/12/amplifierrulefrn.pdf
There is no way they can enforce this. Plus there is lots of wiggle room in there. Just like the THD @1KHz, but there doesn’t seem to be any regulation on the full bandwidth measurements. It’s a joke, paper that is put in place just to shut people up.
There is absolutely nothing in the register that I can find on car audio, nor can I seem to find anything on pro audio.