The only reason i picked the QSC, is i can get 1 new from Musicains Friend, have it in a couple of days. 30 day try out. I've done alot of buisness with them before. If for some reason it is the M80's, and they toast the QSC... I can just send it back to them, say it was no good out of the box. They will just send my money back no questions.