This seems to me somewhat exaggerated(the remarks about stereo and the center image). Sure, the center phantom image generated as a sum of two identical L/R signals sounds a little different. But little is the operative word. The correction for this fairly small (Meridian used to have it up on their website in Stuart's paper on multichannel for example--how to EQ the center channel to match the perceived sound of the two channel phantom. )

Most people do not notice this at all.  I think the speakers
are audible in stereo because of the "detent" effect. If you
keep the images between the speakers where they belong, most
people do not hear the speakers at all.
(I say most people because a small number of people hear individual speakers no matter what you do. My late wife was like this. She hated stereo--but she hated surround more. She liked mono with one speaker!)

Robert

On Sun, 14 Oct 2012, Richard Lee wrote:

well, depends. iirc, theile's argument is that a two-speaker phantom source 
should be a mess in terms of spectrum, but isn't (as two-speaker stereophony 
demonstrates). so for some reason, the brain is able to sort it out. more than 
two correlated sources, and things go awry, e.g. L/C/R
with too much crosstalk is a pitiful mess.

Err.rrh!  Actually two speaker stereo IS a mess in terms of spectrum.  Just compare 
a mono signal panned to CF with it panned to hard left or right.  It's one of the 
things which draws attention to the speakers & spoils the illusion.

One reason for the seamless performance of 1st order Ambi is that, even with 
just 4 rather unevenly spaced speakers, it alleviates this effect and helps 
make the speakers disappear.
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