Well Jay, you actually can have an M60 center(actually two of them)by setting the 886 to no center so that the M60s will then do "phantom" center duty. Of course that means that you wouldn't be using the VP150 at all. Another thing to try temporarily is to set the VP150 vertically on the floor in front of your stand(adjust the 886 for the closer distance)and tilt it back slightly, to see if that improves the center sound any.

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Enjoy the music, not the equipment.