The QBGMC04212 is a custom-fit underseat subwoofer enclosure designed specifically for 2004-2006 Chevrolet Silverado and GMC Sierra Extended Cab trucks. Engineered for strong low-frequency performance while maintaining factory interior space, this enclosure provides deep bass output with a clean OEM-style appearance. Features & Benefits Custom-fit enclosure for 2004-2006 GM Extended Cab trucks Designed for dual 12-inch subwoofers Underseat installation design High-output ported enclosure Heavy-duty MDF construction Maximizes bass while preserving cabin space OEM-style fit and appearance Durable automotive-grade finish Excellent for daily-driver and high-output systems Specifications Product Type: Vehicle-Specific Subwoofer Enclosure Model: QBGMC04212 Subwoofer Compatibility: Dual 12-inch subwoofers Enclosure Type: Ported Vehicle Fitment: 2004-2006 Chevrolet Silverado Extended Cab 2004-2006 GMC Sierra Extended Cab Mounting Location: Under rear seat Construction Material: MDF wood Finish: Black automotive carpet or bedliner coating Air Space: Approximately 1.25–1.5 cubic feet per chamber Maximum Mounting Depth: Approximately 6 inches Port Tuning Frequency: Approximately 35Hz–38Hz Vehicle Compatibility Compatible with select: Chevrolet Silverado Extended Cab (2004-2006) GMC Sierra Extended Cab (2004-2006)
