In all my years of installing and even before when I would just hang out at the shop I have never seen anyone request a grill for their sub. To me it makes no sense and must limit excursion considering the sub can't move past a certain point. I know we do em on coax's, comps, and mid range but do you really get customers asking for grills on their subs as well?
I believe dude has been around to many JL subs...
I guess so