I think you're thinking of the FCC, not the FTC. Also, the FCC doesn't care about if your speakers make noise when they get hit with RF, they only really care

I think you're thinking of the FCC, not the FTC. Also, the FCC doesn't care about if your speakers make noise when they get hit with RF, they only really care that the speakers aren't emitting RF to interfere with the things that are supposed to be.