I tried a variation of this experiment a while ago. I took the Gaucho DVD-A and made three sets of FLAC files: one left as-is (V1), one with the center channel folded into the front speakers (V2), and one with the center channel deleted entirely (V3). I couldn't really tell the difference between V1 and V2, but V3 seemed to be missing some 'oomph' in comparison to the others. That low-level mix of lead vocal, bass guitar, and snare drum in the center speaker adds just a bit more 'punch' and presence to those elements.
Some of Scheiner's other 5.1's have truly discrete elements in the center speaker--examples include the piano in "Free Bird" and acoustic guitar in "Hotel California".
Thanks for this , @sjcorne
Listening this way I wondered if I was missing much ?
Ok so I missed some piano in Free Bird , even though I enjoyed the dvda in 4ch. Oh well.
I have the dvda of Hotel California , so I'll give it a spin later. Might be a big miss if I don't hear all the guitars in the title song.
Have listened to Gaucho dvda , not that bad at all. Oomph ? Maybe just the lack of the extra ch.?
I assume (VI) was listened to in 5.1 , and the other two versions in 4ch ?
FWIW I also tried Visconti's Bowie's and T Rex also some later Steven Wilson mixes.(past 4 or 5yrs)