So I walked into the theater today where the amps had been on all day for the theater camp I am working for to hear a nasty hiss coming from the house right speaker. I am also, btw, the house sound technician at the theater. Anyway, I tracked the problem down to the amp. The hiss stays when the board, graph EQs, and everything else upstream of the amp is off. The only upstream piece of gear still on is the DBX Driverack. I've heard before that this could result from capacitors going bad in the amp, but I don't know. Does anyone have any thoughts? A friend of mine who has been in the business much longer is hopefully going to come in and help me asses the situation before I go to the boss and tell her we need to buy a new one, but I figured I'd check here as well.