07-26-09: Nick_sr
I live in an open concept condo, the room were my system is installed is 24' x 24' with 12'ceilings.
IMO, that's a medium size room, although because of the 12' ceiling, it's a pretty large volume to fill. I'm a little surprised that you find the 40wpc Marantz sufficient, but it's a good sign if you do.
I was under the impression that to get the most out of your speakers it is preferable to drive them and the top end of power range (120W for RS6).
64 wpc would produce 109db peaks on your speakers. Do you listen this loudly? It might be worthwhile for you to purchase a Radio Shack decibel meter and measure your peak listening volume (and your average listening volume).

