Is all ch stereo of the same sound quality as 2 channel listening?

[markw]

So DD or DTS in a movie,is that a novelty? Just ask'n.

My take on the original question was for running a two channel source. For a multi-channel source I would recommend using whatever scheme was used for the original recording. i.s, a two channel source, foro me, should be played back in two channel stereo, a recording done in DD, DTS, MCSACD or MCDVA-Audio formats would be played back in the MC format in which ot was recorded.

Note this applies to music only. DPLII cinema does wonders with a two channel Dolby Surround movie.

IMNSHO, playing a two channel recording in a multi-channel emulation might be entertainiing for a while but, after a short while, the novelty of that experience wears off.