I have 3 S2's with one configured as a center w the tweeter rotated 90degrees. I leave the speaker grill on just because it gets dusty in the cabinet - it doesn't sound any diff with it off. And I have the speaker inside a salamander type cabinet that has a steel grill.

I like the whole setup. Perfect integration btween the Center and LR. I would have gotten a Horizon if I had the room. But it was just too large for my cabinet. That said there isn't really anything I feel I'm lacking but in general my hearing's kind of going and dialog clarity is a day to day struggle sometimes!

Probably I'll just improve my receiver just so I have a little better EQ options.