Check the listing for details. Custom Ported Sub Box Enclosure for 4 10" Subs ~ ACRYLIC PLEXIGLASS ~ BIRCH. Condition: New. Listed at 479.95 USD. This listing is for a custom enclosure built for 4 10" subs. We use 4 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 - Interior - White (Black, Blue, or Red may be substituted by request) - Subwoofers are Recessed 3/4" - Port Tubes - 3" x 11" - Tuned to 34 Hz (adjustable by request) - Black Carpet (charcoal carpet available by request) - Exterior Dimensions - - 39" Length - 15.5" Height - 20" Depth - 1.325 Cubic ft / Sub - Roughly 65lbs - 4 Wire Terminals Included - Sealed air tight with liquid nails caulk