I've managed to blow my Ampeg SVT-4 for the 4th time. The last time it was repaired the tech replaced eveything inside (circuit board too). It runs great in stereo with 4ohm loads on each channel. Its only blown in bridged mono. But I don't notice any major clipping or the limiter led when it blows, it just fries. Could it have something to do with my input? Here's my setup. I run my bass, midi bass, loops, and elec. upright into a mixer, then out through a compressor, then through my effects, then to the Ampeg. When I get going with MIDI drum loops and layered bass parts could it be overloading the circuit? I admit when I've got all those things going it draws serious power, I've popped the circuit breaker in my house before. My next move is to buy a pre-amp for my bass signal and a separate 2 channnel power amp. Then I can run my MIDI/loops through one side and my clean basses through the other into 2 cabinets. That seems like the only option for minimizing the input load. Any ideas?