I used to run all 5 channels thru my "class a-a/b" b&k video 5 "5 channel x 105" amp and I had split my LFE to both channels on my "class a/b" nikko "2 channel x 120" amp. as an experiment, I am now using 2 channels on the b&k for my sub and the nikko is now running my mains. From the few days of listening that I have had it setup this way, I have noticed that the low bass seems to come out cleaner or less restrained. I really dont know what it is but I thought it had something to do with the circuitry. can anyone else explain this?