Wilson Sophia 2: grills on or off ?

I have Sophia 2's as well. I always listen with the grills on. For me, whenever I take the grills off I can see the speaker diaphragms moving (woofer and mid), even in a dark room, and this dramatically takes away from the illusion of reality for me due to my shift in concentration.

I actually prefer the sound of my WP7s with the grills on. I do hear a slight, but noticeable increase in high frequency "sparkle" and definition with the grills off, but I feel that this comes at the expense of a slight degree of smoothness that is of more value to me.

I had the Sophia 2s and preferred using them with the grills on...seemed to have a modest...very modest impact at taming the somewhat hot high end to make them more musical...I suspect, pure guess on my part, that they were designed to have the grills on...can't spectulate on the 7s or 8s...but I suspect the same would be true on the 8s given the more thoughtful grill system...

John