I second comments by chess and Peter. I understand that the VP150 is not designed to correct for the “extended baffle” effects when placed directly on a large RPTV. That alone may well be the cause for the perceived timbre mismatch, which would be corrected by slightly rearranging the center channel placement and directions. Also, I would ask you whether your left and right M22’s are really well timber matched with each other. In fact, my L/R fronts do not sound perfectly timbre matched, obviously due to the speaker-room interactions. This was further corroborated when I bought the Pioneer 45TX receiver; the auto-MCACC equalization feature in fact always results in very different EQ parameters between the L/R fronts and between L/R surrounds. Some EQ bands exhibit up to 4-5dB mismatches.
Bottomline: Don’t underestimate the effects of the room, the “forgotten component” as Alan calls it.
