Mike, Alan apparently hasn't been back, but hopefully wiil be able to add his input. My view, as I've indicated before, is that if you have the space under the screen, then there're no cons to using a vertical speaker identical to the mains(or similar M60). You'd have the advantages of essentially identical frequency response and dispersion all across the front. The advantage of the horizontally configured center being able to lie fairly flat to the top of the TV obviously wouldn't be relevant.

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Enjoy the music, not the equipment.