It'd be nice if Meridian offered a music surround mode that left the Left and Right channels "pure" while adding ambiance via the surrounds.
Why not simply choose to turn off the center channel in music modes? It's one of the setup options.
Simple answer to that. In ALL DSP modes the corruption in the L/R stereo output is evident. Only in "Direct" will you get a true L/R signal.
Note that the "corruption" is not an issue for most sources, but if you want the best possible sound from CDs or music DVDs + synthesised surround, then what brucemck2 & I do is the only answer at the moment.
John