Mark, you should have confidence that either the VP160 or VP180 would be a significant improvement for center channel material in your setup. Note that on the VP160 page here Axiom states that "...the VP160, is the best center channel speaker for our award-winning M60 floor standing speakers as well as any other speakers in our tower lineup". Of course, whether you'd find that the improvement is worth the cost is your personal decision.

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Enjoy the music, not the equipment.