Hey last night we were using a QSC plx3602 amp. When we were testing it out (I was talking into a mic saying test, test) when the amp shot sparks and started smoking. This was a rental and if it was not our fault we are not liable. I am trying to figure out what we would have had to do to cause this? Everything should have been right except maybe the crossover (I think thats what it is called it the switch with bridge, parallel, etc. on it) I do pro sound for my church so I am not an idiot at this but I'm just trying to figure out what could have happened. any ideas?