I have a three room system (using a Niles switching system to change between rooms). In one of the rooms I do not have a center channel (only two fronts, two rears, and a SW). For all non SACD sources, there is no problem, (in speaker setup, when using that room I indicate Center Channel as "NONE"). This doesn't seem to affect SACD playback however; could it be that the "none" setting for the center channel doesn't apply in the 6 channel bypass mode, and that one HAS TO use a center channel for SACD playback?? I would very much appreciate any feedback on this....