Rockville (4) W8K5S4 8" 4-Ohm Subwoofers + Sub Box Enclosure for 2007–Current GM Crew Cab

Package includes four Rockville W8K5S4 K5 Series 8" subwoofers (single 4-Ohm voice coils) plus a sub box enclosure sized for 2007–CURRENT GM Crew Cab installations. Designed for efficient low-frequency output and durable long-term use. Key power ratings: Peak 800 Watts, Program 400 Watts, CEA Rated RMS 200 Watts. Motor & voice coil - 1.5" 4-layer black aluminum voice coils wound with OFC (100% Copper) wire. The coil wire is imported from Japan for improved quality over standard alternatives. - 30 Oz high-quality magnet. - High BL magnetic motor gap and 5mm T-yoke + 5mm washer construction. - Vented hole on the T-yoke to aid heat dissipation. - Rubber boot magnet covers protect the magnet and give a clean appearance. Cone, surround & basket - Fiber reinforced ultra-stiff black non-pressed paper cone for efficient sound output that requires less amplifier power. - Thick foam surround for improved sound quality with minimal distortion. - Blue stitching cone reinforcement for enhanced longevity. - Lightweight paper dust cap to help the driver play louder with modest amplification. - Cast iron basket with a black sanded finish. Terminals & mounting - Chrome-plated binding post terminals accept any gauge wire. - Mounting gasket with Rockville branding for a clean, airtight installation. - Cutout diameter: 7.16 inches. - Mounting depth: 3.54 inches. Performance & enclosure recommendations - Frequency response: 37 Hz - 1.3K kHz. - Sensitivity: 85.7 dB. - Recommended sealed enclosure volume: 0.35 - 0.85 Cubic Feet. - Recommended vented/ported enclosure volume: 0.6 - 1.2 Cubic Feet. Build & adhesives - Uses the highest grade black glue rated for very high temperatures to help the woofer withstand power above its rating. Weights, shipping & physical details - Driver weight: 5.2 Lbs. - Shipping weight: 6.5 Lbs. - Shipping box dimensions: 10.25 x 10.25 x 8.1 Inches. Detailed mechanical dimensions - Body: Non-Pressed Paper. - Gap plate inside diameter: 60mm (2.36 inches). - Gap plate outside diameter: 120mm (4.72 inches). - Gap plate thickness: 25mm (0.98 inches). - Yoke outside diameter: 114mm (4.48 inches). - Yoke thickness: 5mm (0.20 inches). - Yoke pole diameter: 38mm (1.5 inches). This kit provides a balanced combination of efficient cone design, robust motor components, and installation-friendly hardware for upgrading bass in compatible GM Crew Cab trucks.