Charles, there's sometimes a misunderstanding about two considerably different types of processing that can be applied to CDs and other two channel material. One is the DSP modes such as Jazz Club, Beergarden, Sportin' House, etc. which add amounts of reverberation to the material in quantities that the designers consider to be pleasant. The other is modes such as DPLII(x), Logic 7 and Neo:6 which add nothing artificial, but simply extract the ambience reflected from various directions during the recording and which had to be placed in the only two channels which were available. It's the reproduction of this ambience which originally came from the sides and back entirely from two front speakers which is "unnatural". No home reproduction can duplicate the experience of the live performance, but reproducing the ambience from side and/or back surround speakers where it belongs can bring us a little closer to reality. The effectiveness depends on how much ambience is mixed into the stereo channels and very dry close-up recordings will show less benefit. In any case, we aren't confined to the limitations of two channels when we have the speakers and processing available and this shouldn't be wasted.
