Check the listing for details. Custom Ported Sub Box Enclosure for 1 8" JL Audio 8W7 8W7AE-3 ~ PLEXIGLASS ~. Condition: New. Listed at 284.95 USD. This listing is for a custom enclosure for a JL Audio 8W7AE-3 Sub with a plexiglass window. We use a 3" aeroport to reduce port noise so you get nothing but clean clear bass from your sub. Also, the sub is recessed 3/4" into the box. We use an internal brace for added support. All joints are glued and screwed together to insure that the box will hold up against the high output of the subwoofer for as long as you need it to. - 3/4" MDF Construction - Window - 1/2" Plexiglass - 6" x 6" - Port Tubes - 3" x 10.5" - Tuned to 36.8 Hz (adjustable by request) - Black Carpet (charcoal carpet available by request - Exterior Dimensions - - 20" Length - 11.25" Height - 16" Depth - Net Volume - 1.0 Cubic Ft - Roughly 25 lbs - 1 Terminal included - Sealed air tight with liquid nails caulk