I tried my Revels grills on/off when I first purchased them. The grills had a noticeable detrimental effect on the sound. Luckily the baffles have the same finish as the rest of the cabinets. I also know where the grills are, on the top shelf, in the back of the garage, with all of my saved component cartons.
She loves me she loves me not!
So - as in the saying above when de-pedaling a daisy...
Speaker grills on speaker grills off.
The reasoning for my question if I keep them off inevitably I will damage them moving them around when in the garage- -forget where I put them - and bitch cause they take up space.
Thank you for the education.