Hello ngem33r, and firstly let me say thank you for such a helpful and informative thread. I work as an electronics repair tech and have also repaired many different BASH amplifiers, however this one has me stumped and I'm hoping you may be able to help. It is one of the Klipsch Synergy Sub 12 amps, that seems to feature on this thread the most. Problem with it is very low level audio only when gain control is at max. I have confirmed the power supply is working, measuring the two resistors by the ribbon connector I'm getting approx 3.43 volts from each rail to ground, or ~6.5 volts between them. Is this within spec? I have replaced Q5, tested the zener and its holding 13v drop, and I have replaced all capacitors. I removed the BASH board and tested all components individually and they all check out OK. Could this fault still be in the BASH drive circuit or is it more likely to be a fault in the output stage? Any thoughts or recommendations would be greatly appreciated.