Sugarbrie is correct re: B&W Nautilus. Per the N803/N804 owner's manual: "For the most discerning listening, remove the cloth covered grille as described below in the section "Aftercare"."
The protective grille over the tweeter, on the other hand, should never be removed per the instructions.
The protective grille over the tweeter, on the other hand, should never be removed per the instructions.