I have a stereo power amp rackmount. I would like to run the mono signal from one pre amp into one side of the power amp, and the mono signal of another pre amp into the other side of the power amp. Then I would use an AB switch to switch between the pre amps. Then from one output channel of stereo power amp out to a cab, and the other channel out to a different cab. I am assuming this is not a problem? I guess i should make sure that the two cabs are the same ohms?