I was at the mastodon concert last night with converge and priestess. It was a killer show, but Brent blew up not one, but two of his amp heads! I remembered that i read in guitar world that he had a pedal called the mastortion and that it would blow up his amp heads every once in a while. Never thought i would actually see it happen even once, but twice is a different story. Long story short, why does this happen? Is it because the wattage is too much for the amp? Thanks.