~20 years ago when Manhattan still had several audiophile stereo equipment stores, I got kicked out of one for playing my own score (I'm a sound designer for contemporary dance and back then mostly made mixes of recorded natural sound). The owner yelled at me for playing "warble tones". Not sure why I'm thinking about it today, but I finally looked up what a warble tone is and I can't figure out how that kind of sound could possibly damage any equipment, certainly not any more than another sound of equivalent energy. Also not finding any stories of blown speakers attributed to warble tones. I've always thought the owner's reaction was ignorant, but maybe someone has some insight?
Edit: I mean, if he had said "dude, get out of here, your music is awful and driving away customers" that would've made more sense.