I don't think purchasing the upper module of the 938 is a good idea; the crossover point from the bass is at 230Hz. Maybe the HPS-906 may be a good solution, why not check if Hyperion is willing to sell just one for center channel usage?
I have been told that a center channel for the 938s will be available late this fall by a company rep here in Atlanta. I'd wait for it if I were you...
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