JL Audio CP108LG-W3v3 Enclosed Subwoofer System with Single 8W3v3-4 Subwoofer Driver, Black Carpet (250 W, 4 Ohm) - Ported Enclosure Extensive interior bracing Enclosure Dimensions: 5.125" D x 18.500" W x 11.125" H Enclosure Dimensions: 5.125" D x 18.500" W x 11.125" H Enclosure Dimensions: 5.125" D x 18.500" W x 11.125" H