Rockville RBS12 Single 12" 2.6 cu.ft. SPL Vented/Ported Subwoofer Enclosure Box Rockville RBS12 Single 12" 2.6 cu.ft. SPL Vented/Ported Subwoofer Enclosure Box Single 12" SPL vented subwoofer enclosure. Tuning Frequency: 43 Designed to increase SPL - This box will make your sub louder than other enclosures 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 with most of todays popular woofers. These enclosures are built with the quality additives needed to maximize the performance of any sound system. Rockville RBS12 Single 12&#034; 2.6 cu.ft. SPL Vented/Ported Subwoofer Enclosure Box Single 12&#034; SPL vented subwoofer enclosure Designed to increase SPL - This box will make your sub louder than other enclosures 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 with most of todays popular woofers. These enclosures are built with the quality additives needed to maximize the performance of any sound system. Tuning Frequency: 43 Hz Type of Enclosure: Vented Enclosure Sub Size: Single 12&#034; Dimensions in Inches: 14.75&#034; L x 30&#034; W x 14.75 H&#034; Top and Bottom Depth: 14.75&#034; Mounting Depth: up to 10&#034; (enough depth for any sub on the market) Gross Volume Per Sub (Measurement for the outer dimensions of the box): 3.7 Cubic Feet Net Volume Per Sub (Measurement for the outer dimensions of the box less the thickness of the wood): 2.6 Cubic Feet