Hi. I was just reading through a Trace Elliot technical manual(as you do...hey, it's a Monday night!)and I saw that they say square edge distortion kills speakers very easily. This I already knew(and understood). What I don't get is that you see people who use distortion/overdrive pedals or effects into their speakers, and you hear nothing about damaged speakers. Are these effect units somehow special, do they produce a non-square edge signal?