John, either am I?

I would say for HT movie surround effects, it is not as important that the surrounds or rear surrounds match the mains. However, for music listening this could make a difference.

In general, it is important that your center channel speaker match your left/right mains.

Again, I'm not familiar with this model of B&W speaker?

Randy

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85