Check the listing for details. Custom Ported Sub Enclosure Subwoofer Box for 4 12" Subs - 32 Hz ~ 8 CF Net. Condition: New. Listed at 589.95 USD. This listing is for a custom enclosure with 1/2" plexiglass windows for four 12" subs. We use six 3" aeroports to reduce port noise so you get nothing but clean clear bass from your subs. Also, the subs are recessed 3/4" into the box. All joints are glued and screwed together to insure that the box will hold up against the high output of the subwoofers for as long as you need it to. - Material: 3/4" Birch Plywood - Subwoofers are recessed 3/4" - Port Tubes - 3" x 11.25" - Plexiglass 12" x 10" x 1/2" - Tuned to 32Hz (adjustable by request) - Black Carpet (charcoal carpet available by request) - Exterior Dimensions - - 46" Length - 17.25" Height - 26" Depth - Net Volume - 2.0 CF / Subwoofer - Roughly 90 lbs - Gold plated terminals included - Sealed air tight with liquid nails caulk