R/T 800 Enclosure Series (838-15) - Dual 15" Slot Vented Sub Bass Hatchback Speaker Box with Labyrinth Power Port (Separate Chambers) Dimensions: 35.25" W x 17.25" H x 20.5" D Air Volume: 2.77cf per chamber Tuning: 38Hz Mounting depth: 11 7/8" Made in the USA - 3/4" MDF