I apologize in advance for my ignorance...and I did search and couldn't find this answer. I've always used "all in one" heads in the past. But now I have a nice preamp that I'd like to get a seperate poweramp to run, e.g. Crest, Peavey, Crown, whatever. Here is my questions/s: If the power amp has 2 channels....if I plug my pre into input channel A, only the output for channel A will carry what's coming out of my pre, correct? So I could NOT have two 8ohm cabs running powered by channel A, and also have one 4ohm cab on channel B at the same time? Also, and this is "master of the obvious", but just figured since we're here....when the rating on the power amp says each channel is rated for 200watts at 8ohm, 400watts at 4 ohms, is it just like what I've always used and I can hook two 8ohm cabs to one channel and get 400watts. Thanks in advance guys, just trying to educate myself before I buy the wrong power amp, and/or blow something up.