Rockville REC97 Dual 12" Ported SUV Subwoofer Sub Box Enclosure - Behind 3rd Row Rockville REC97 Dual 12" Ported SUV Subwoofer Enclosure - Behind 3rd Row. Fits Behind 3rd Row, Downfire Finished with Durable Bed Liner 3/4" MDF. Air Space: 1.25 Cubic Feet (per sub) Mounting Depth: 9". Product Dimensions (H x W x D): 13.5" x 42.25" x 16.25" inches Rockville REC97 Dual 12&#034; Ported SUV Subwoofer Enclosure - Behind 3rd Row Fits Behind 3rd Row, Downfire Finished with Durable Bed Liner 3/4&#034; MDF Air Space: 1.25 Cubic Feet (per sub) Mounting Depth: 9&#034; Product Dimensions (H x W x D): 13.5&#034; x 42.25&#034; x 16.25&#034; inches