Rockville RSV15 15" Vented Car Audio Subwoofer Box 2.6 Cubic Ft. Sub Enclosure Rockville RSV15 Single 15" 2.6 cu. ft. 3/4" MDF Vented Subwoofer Enclosure Box Machine precision cut mounting holes.  USA Heavy Duty MDF Construction Top of the line Glue for extra durable adhesion. High quality GOLD spring loaded terminals Designed, tested, and engineered to work perfectly with high powered subs Designed to give the best sound quality Rockville RSV15 Single 15&#034; 2.6 cu. ft. 3/4&#034; MDF Vented Subwoofer Enclosure Box Machine precision cut mounting holes USA Heavy Duty MDF Construction Top of the line Glue for extra durable adhesion High quality GOLD spring loaded terminals Designed, tested, and engineered to work perfectly with high powered subs Designed to give the best sound quality Tuning frequency: 32Hz Type of Enclosure: Ported/Vented Enclosure Sub Size: Single 15&#034; Dimensions in Inches: 21&#034; x 18&#034; x 16.25&#034; Top and Bottom Depth: 16.25&#034; Mounting Depth: up to 15&#034; (enough depth for any shallow sub on the market) Gross Volume Per Sub (Measurement for the outer dimensions of the box): 3.5 Cubic Feet Net Volume Per Sub (Measurement for the outer dimensions of the box less the thickness of the wood): 2.6 Cubic Feet