Speaker grills on or off?


Which sound do you prefer from your speakers - with grill on or off?
50jess
.
When listening, grilles off. When not playing, grilles on.

I don't know if there really is a difference, but just in case the grilles arent absolutely acoustically transparent, I keep them off when listening seriously.
Agree that it depends on the speaker. My bookshelves sound better off, more dynamic. In main system, floorstanders are noticeably more cohesive with grills on.