Put some bass in your space and trick out your truck with a sound system designed to be just the right fit with the QPower QBomb GMC/Chevy 1999-2006 X-Cab Classic Dual 12-Inch Subwoofer Box.This dual 12-inch sub box is designed to downfire right under the rear seat for max bass response. It features 2 separate air chambers with 0.95-feet of air space per sub plus 5.5 inches of mounting depth. It's finished with a tough bedliner spray so it stands up to years of use.If you're looking to put some big sound into your 1999-2006 Chevy Silverado or GMC Sierra Extended Cab Classic truck models, this is the box for you.