I don't believe Doc's statement is extreme at all, the possibility of a fire with a amp design like that could happen. "Potential" is there for it to happen. Back when EMO had that XPA-2 amp umm around 2011 there was one dude who had one, if I remember he stated it caught on fire, blew up or something like that. But it was found out that he was using it in bridge mode if I'm not mistaken and with the speakers he was driving had dropped to around a 2 Ohm load.\n\n\nIt's likely that the output transistors 'blew up' because they couldn't handle the heat which, as I have posted many times, is what kills components. It's not an explosion, it's a pop, accompanied by a flash and some bad odors. Same goes for power supply filter caps, but they're larger, smell worse and it's a lot louder. If the cover was on the amp,. the fire wouldn't likely spread too far unless it was in a wooden cabinet and the space above it wasn't adequate. Yeah, 2 Ohm loads on amps in bridge mode- sounds like he didn't RTFM.