Hey, I think i would have to agree with you on the amp difference thing. I guess what I was thinking is that...I have a zapco 2 channel running my mb quart components, and I switched my friends 4 channel alpine in to test it for him. Anyway, I could tell a difference, but then again...I was messing with the settings and everything else, also, it was a bit older, and was a four channel, not a 2 channel. Maybe the difference I was hearing was in the different set up's of the amps