Check the listing for details. Custom Ported Sub Enclosure Box for 1 15" Massive Audio BOA 151 Subwoofer ~BIRCH. Condition: New. Listed at 449.95 USD. This listing is for a ported enclosure for an 15" Massive Audio BOA 151 151N subwoofer. We use 3" aeroports 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. All joints are glued and screwed together. We include an internal brace 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 - 1.5" Mounting Surface - Internal Brace Included - Plexiglass Window: 1/2" Thick - 14" x 12" - Port Tubes: 3" x 11" - Tuned to 33 Hz (adjustable by request) - Black Carpet (charcoal carpet available by request - Exterior Dimensions - - 34" Length - 17.25" Height - 22" Depth (Dimensions are adjustable by request - please confirm before purchase) - 5.25 Cubic Ft - Net Volume - Roughly 60 lbs - 1 Terminal included - Sealed air tight with liquid nails caulk