Speaker grills on or off?

Definitely off - if you ask any musician, speakers sound closer to musical instruments with off for sure.

DUH? whichever sounds better withat speaker in that room.

The decision needs to be made by your ears, your heart, and your soul. There is no right or wrong. For me and my Revels, grills off. For you, it may be different. The best part ? ... it's a zero expense experiment ! Listen to your speakers both ways, and have fun deciding which way sounds best.

Depends on the speakers. Some speakers such as the Thiel CS 2's were designed to be used with the grills on.

I agree that dome speakers were designed with them to stay on.

Here's a thought; why not one on, one off ;-)