the reason i don't need a center speaker is the fact that the great majority of the time i'm all alone watching movies or TV and i sit right at the center.
the right side chair is rarely used, a max of 3 hours a week, all in one sitting.

as i'm always sitting dead center, the dialog is always dead center too.
the dialog is also very easily understandable.

if i really needed a center speaker, then i would surely install one, most probably suspend it from the ceiling, as JC suggested.

See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery