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Custom X-Cab Classic Fit: Dual 12" underseat subwoofer enclosure designed for 1996-2006 Chevy Silverado XCab and GMC Sierra XCab Classic trucks; Not suitable for Crew Cab models. Durable Construction: Sturdy 5/8" MDF enclosure covered in charcoal carpeting. Convenient Underseat Fit: Compact downfire design installs neatly under the rear seat and maintains cabin space. Optimized Audio Performance: 0.95 cu. ft. air space per sub, 5.5" mounting depth, and downfire layout provide deep, controlled low-frequency output. Recognized for precision-fit enclosures and reliable audio solutions, offering performance-driven designs for dedicated audio builds