Interesting! So the back channels are supposed to blend? It would seem to make sense that a diffuse back area would present a more realistic sound envelope but at the same time I can imagine that a perfectly matched set of 4 speakers all with great imaging would create the same impression.
Is it more an issue of rooms being to corrupted to present good imaging with direct speakers? Or, are the channels in a movie sound track designed to be diffusely projected and trying to do it with direct projection leads to a loss of sound envelopment?
Sorry about the questions, but i'm trying to design a system where the listener feels enveloped in a sound stage and not just detecting sounds from front or back.
For instance, I have always been sensitive to the subtle differences in timbre that exist between a set of mains and their supposed matched center channel. When a movie scene pans accross the sound stage the small difference in SQ ruins the aural effect for me. It sounds less like something moving from left to right and more like the speakers turning on and off left to right (if that makes sense).
It seems there are two options. Indirect radiation of the Fronts AND Rears with a center channel to "anchor" the vocals. OR Direct sound in perfectly matched speakers so the sound fields blend into one another creating a 3D imaging effect.
Given what i'm trying to create... Which of those options seems to be the better option? Or is there another option??? Thanks all!