David, that's understandable, so you should use the M80s, not the VP150, for the vocals. Nevertheless, you should still play in surround sound, probably using DPLII. To take the VP150 out of it you can either set the speaker menu to center "None" or set the Center Width DPLII parameter all the way to the outside. In either case, the M80s will play anything that would ordinarily have been assigned to the center speaker, but you'll still have the surround effect of the rest of the DPLII mode.

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Enjoy the music, not the equipment.