Chevy Avalanche Cadillac Escalade EXT Speaker Box Sub Midgate Subwoofer EnclosureCustom fit for the Chevy Avalanche and Cadillac Escalade EXT Box will look like the first 3 Pictures Box can be sprayed with a rugged truckbed liner like 4th Picture Box will fit in the truck like the 5th picture Listing is for 2 12's Hole cutout: 11. 125" (11 1 8) Box will not swing open like factory midgate Box constructed of 3 4" MDF, glued and nailed About 3 cuft of airspace per chamber Tuned at 32 hertz Custom tuning, airspace, hole sizes and