The QBGMC142124DOOR is a custom-fit dual 12-inch underseat subwoofer enclosure designed specifically for 2014-2018 Chevrolet Silverado and GMC Sierra Crew Cab trucks. Engineered for maximum bass performance while preserving factory interior space, this enclosure delivers powerful low-frequency output with a clean OEM-style appearance. Features & Benefits Custom-fit enclosure for 2014-2018 GM Crew Cab trucks Designed for dual 12-inch subwoofers High-output ported enclosure design Downfire subwoofer configuration Heavy-duty MDF construction Maximizes bass while maintaining usable cabin space OEM-style underseat fitment Durable black automotive-grade carpet finish Excellent for daily-driver and high-SPL systems Specifications Product Type: Vehicle-Specific Subwoofer Enclosure Model: QBGMC142124DOOR Subwoofer Compatibility: Dual 12-inch subwoofers Enclosure Type: Ported / Downfire Vehicle Fitment: 2014-2018 Chevrolet Silverado & GMC Sierra Crew Cab Cab Style: 4-door Crew Cab Construction Material: MDF wood Finish: Black automotive carpet Mounting Location: Under rear seat Mounting Depth: Approximately 5.75 inches Air Space: Approximately 1.5 cubic feet per chamber Port Tuning Frequency: Approximately 35Hz–38Hz Vehicle Compatibility Compatible with select: 2014-2018 Chevrolet Silverado Crew Cab 2014-2018 GMC Sierra Crew Cab
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