Hopefully this is not too dumb but here goes... Can you use just one side of a stereo power amp or do you have to run it bridged if you want mono output? I'm thinking about going to a pre amp/power amp setup and would like to be able to haul just one speaker to small gigs/rehearsal and run it thru one side of the amp. Then I can bi-amp 2 cabinets, one thru each channel, for more sound when needed for larger places. Is it ok to run just one side of a power amp??