QPower QBGMCFF0740 8 Inch Quad Port Subwoofer Box for GMC and Chevy Crew Cab

4-hole 8-inch openings allow for an ideal fit for 4 subwoofers Underseat down fire capabilities feature louder and crisper sound Bed liner material provides durability and protection Engineered to fit GMC and Chevy Crew Cab from 2007 to current Enclosure's design makes for an ideal spot for loud bass playing Tuning frequency: 35 hertz Air space: 0.8 cubic feet Mounting depth: 11.25 inches Subwoofer size: 8 inches Color: Black