I recently built a subwoofer cabinet for the AV12 when they become available. It's a 20x20x22 cabinet with the dual 15 PR's. I have the PR's surfaced with veneer to match the box, but I am thinking about making a grill to cover up the driver. For my tower speakers I used 1/2" mdf and wrapped them in Parts express grill cloth. I think the grills add a nice finihsing touch. I would like to do the same for my subwoofer, does anyone know if 1/2" will be thick enough, or should I double it up to make a 1" thick grill? Oh yeah, the driver is going to be flush mounted.