Ported MDF Subwoofer Enclosure for Single 12" JL Audio W7 (12W7, 12W7AE) Sub Woofer Designed and built using JL Audio's ported box design for a single JL Audio 12W7 / 12W7AE subwoofer 0.75" Premium MDF with Reinforced 1" MDF Front Baffle 1.75 Cubic Feet @ 36.7Hz Sub Cutout Diameter: 10.5" Dimensions (W x H x D): 22.75" x 15" x 15.875"