center channel speakers --- low height


I am installing a home theater and I have a size constraint for the center channel speaker. It has to be no higher than approximately 6 inches. The Revels and the Sonus Faber won't work and I didn't particularly like the sound of the B&Ws that would fit for this application. Any recommendations?
bwolkowitz
These suggestions are very helpful. I will not mismatch speaker manufacturers for the reasons stated. I like the idea of a phantom center channel and will give it a try.
In the meanwhile I called Sonus Faber because I noticed that their Domus center channel is low and might work. They felt that a combination of Domus center channel and surrounds with Cremona Auditors would work well. Do you all agree that this could be a good solution?
i use the sonus faber wall speakers x 5 ( one of the wall speakers as a center)...

i think as long as stay within the same mfg. you might be okay (ie keep the sonus faber house sound).
That would work. As long as the frount 3 match so voices don't sound different in the sides and center.
Programmergeek and Mikesinger thanks for the response to my follow up question. The combination of Sonas Faber speakers is probably the way I will go. Appreciate your advice.