Yeah, Chet; that's been discussed here occasionally. Although I personally have no need for a horizontally configured center speaker and suggest a small vertical unit if one identical to the mains can't be accommodated, I've also suggested that the W T/M W configuration be considered. One possibility would be the 4" mid-range from the QS4 with the standard tweeter above it, and flanked closely by the 6 1/2" woofers.

As you mention, there are quite a few(but not most)centers configured this way which perform very well. Axiom appears to be at a competitive disadvantage in this area.

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Enjoy the music, not the equipment.