Car Audio Single 15" Vented Subwoofer Stereo Sub Box Ported Enclosure 3/4" MDF Go to amazon.com Related posts Best 15 subwoofer box for 2020 FeatureDimensions: Width 21-1/2" x Height 16-1/2" x Depth 18"Mounting Depth: 17 InchesAir Space: 2.65 Cubic Feet