Evening all, Been thinking about this power amp lark. I have the older Yamaha 640SE amp, and am wondering how I could upgrade amp-wise. Rather than upgrade to another complete AV amp, would I be better off getting a seperate power amp? Would this be adding to every channel or just the front two? Also, are there any particular makes/models of power amps you could recommend to add to my system? Here's what I got: Marantz DV4500 DVD. Yamaha 640SE amp (obviously) Mordaunt-Short Avant 906 fronts, 905c, 902 rear. I have just looked at what appears to be an absolute beast - the Rotel RMB1075. If I hooked up something like this to my comparatively tiny Yamaha amp, would I notice a hug improvement in sound quality? Or would I just be wasting the Rotel's potential? Any suggestions folks?