I used their matte white with a gain of 1.0 I believe, I think gray will give you better contrast and blacks, but that Panny does a pretty good job as is...the gray might not be as bright, especially in a room that you can't control the light.
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M80s-VP180-4xM22ow-4xM3ic-EP600-2xEP350
Anthem AVM60 Outlaw 7700 Emotiva A500 Epson 5040UB