R/T 300 Enclosure Series (318-15 Diamond) - Single 15" Slot Vented Sub Bass Hatchback Speaker Box with Labyrinth Power Port for Diamond Audio Subs Made in the USA with premium 3/4" MDF 3.2 Cu. Ft. Air Space/Tuning - 32 Hz Easy Hook Up Terminal Cups Automotive Grey Carpeting 24" W x 17.5" H x 19.5" D