I agree with Madhf.
I have incorporated a center channel, a 3-channel amp to drive center and rear speakers, a pretty good processor(Integra) and an Oppo BDP-95 for movies only. I integrated a sub I already had and run the processed signal through my 2-channel preamp and amps for the front 2 channels. After a little balancing and room correction, I have excellent movie sound when I want it without any deleterious effect on my 2-channel system whatsoever. Its a win-win and what I would recommend if you can pull it off.
I have incorporated a center channel, a 3-channel amp to drive center and rear speakers, a pretty good processor(Integra) and an Oppo BDP-95 for movies only. I integrated a sub I already had and run the processed signal through my 2-channel preamp and amps for the front 2 channels. After a little balancing and room correction, I have excellent movie sound when I want it without any deleterious effect on my 2-channel system whatsoever. Its a win-win and what I would recommend if you can pull it off.