Type of Enclosure: Vented Enclosure. Sub Size: Single 12”. Tweeter: (2) 3.5”. Alt Speaker- (2) 6.5”. Dimensions in Inches: 37.87 x 15 x 20. Mounting Depth: up to 11.0” Gross Volume Per Sub (Measurement for the outer dimensions of the box): 2.73 Cubic Feet Net Volume Per Sub (Measurement for the outer dimensions of the box less the thickness of the wood): 2.05 Cubic Feet The REC138 speaker box is made in the USA with Grade “A” 5/8” MDF wood. This enclosure is made with precision cutting machinery by industry experts that have been making these enclosures in the USA for over 20 years. All Rockville Sprayed enclosures come with actual Bed Liner spray, not Black Paint. That means your Speaker Box is sealed for life. The5/8” USA MDF is much stronger than any type of import wood. This will keep your box performing at an optimal level by not flexing and distorting your woofers. Your woofers will thank you! EVERY Rockville enclosure is not only glued at all joints but stapled as well. If that wasn’t enough we add a layer of silicon to every seam! This makes your Rockville enclosure rock even more! MADE IN THE USA WITH PRIDE!