I totally fried my carvin 1000 watt head. I actually have no clue how it made it as long as it did. The head has a switch in the back for bridging mode. I was running it bi-amped with the bridge swith on (I know, dumb mistake. but it came from the factory on). One day it just blew. It blew the circuit breaker and my whole room stinked like a blown head. I smelled the back of the head and damn near puked from the pungent aroma of skankyness. But the folks at carvin were real cool and are fixing it for me. So the story ends on a good note.