grills or no grills on your speakers..matters?

Depends on the speaker and the grill. Off for most for sound..looks are secondary unless you date porn stars. Then it's grills off.

I keep the tops off and the bottoms on now while listening. Wilson Witt series II. The Lipinski L707's were always run with the grills off. They don't even cover the tweeters on their speakers. I run an Orick Air Purifier to keep the dust down in the listening room.