Check the listing for details. TRU SPEC Prefab Single 15" Ported Subwoofer Enclosure Subs Up Port Back box. Condition: New. Listed at 299.99 USD. ***DUE TO THE CURRENT HIGH VOLUME OF HOLIDAY ORDERS, OUR LEAD TIMES ON TRU SPEC ENCLOSURES WILL HAVE TO TEMPORARILY BE INCREASED 14 DAYS (10 BUSINESS DAYS).*** Every Tru Spec enclosure is computer designed, CNC cut, and assembled inhouse at GPcarAudio. Tru Spec Prefabricated enclosures are simple, straight to the point, true to spec sub enclosures with proper airspace and non restrictive port area that allows you to have custom box performance at a reasonable price. TRU SPEC PREFAB single 15" Sub up port back with double flush baffle Material: 0.75" MDF Total woofer displacements factored in: 0.24 cuft ) *What does this mean? You will have 3.5 cubic feet of internal volume AFTER your sub displacements. (Most 15" are around 0.15-0.25 cuft displacement) Box External Dimensions Width × Height × Depth 34.00" × 14.00" × 22.00" Material Thickness 0.75" Net Internal Volume 3.50 ft3 Tuning Frequency 35 Hz Port Area 52.00 inch2 Cutout Diameter: 14.2"Flush Trim Diameter: 16.00"