Need help to fix Hales Revelation One


I have a pair of Hales Revelation One setup as surround, recently I found out one there's no sound from one of the woofer, but can't find a way to open the grill or from the rear.
Is tearing off the grill the only way ?
tqn999
Got it !
Again, thanks, the grill cloth actually has a plastic strip acting like a shoe lace and crosses at the bottom. I pulled the crossed section out and .. that's it.
Anyone know if it's the same way on the Rev 3? I've tried pulling on the cloth and I cant seem to get it to budge without tearing. The frame does seem to move a bit if I tug it up, but I can't tell what's going on under the sock :/