Originally Posted by Gianni
What additional qualities (not capabilities, e.g Trifield) do centre speakers provide aver a stereo pair?
Center image is vastly improved with a proper center speaker if the source has a discrete center channel.

Originally Posted by Gianni
The discussion talks about needing to match the centre to the fronts when, in most domestic cases, there will be a compromise, meaning a horizontal centre with the front tweeters being at different levels.
True and unfortunate.

Kal Rubinson
"Music in the Round"
Senior Contributing Editor, Stereophile