In 1978, I was playing my vintage 1976 Khorns extremely loud (Cheap Trick Live at Budokan) and I fried both woofers. I didn’t damage the tweeters or midranges which does seem strange now. At that time, I called Klipsch, and they sent me two new drivers for free! I was using a McIntosh MC 2100 at the time of the incident.