Rockville W12K9D4 K9 V3 12" Dual 4-Ohm Subwoofer — 4000W Peak / 1000W RMS

Overview: The Rockville W12K9D4 K9 Series V3 is a 12" car subwoofer built for high power and durability. It features Dual 4-Ohm voice coils and is rated for 4000 Watts peak, 2000 Watts program, and 1000 Watts CEA RMS. Voice Coil & Cooling: This sub uses a 3" 4-layer black aluminum voice coil wound with OFC wire. The OFC wire is made in USA and the coil is rated to handle 240℃, providing superior temperature resistance and long-term reliability. A vented hole on the T-yoke improves heat dissipation. Motor & Basket: The woofer employs a double-stacked 190 Oz high-quality magnet and a cast aluminum basket finished in black sanded paint, yielding a lighter but efficient motor structure. A high BL magnetic motor gap and a 10mm T-yoke + 10mm washer are used to maximize motor strength. Terminals & Connectivity: Two chrome-plated binding post terminals provide secure, oxidation-resistant connections and accept any gauge wire for easy hookup. Cone, Surround & Suspension: The cone is a black non-pressed paper design with a refined finish for added stiffness. Thick foam surround and red stitched cone reinforcement reduce distortion and extend lifespan. A new ultra-stiff polypropylene (PP) dustcap is included, and a Nomex spider offers superior tear resistance and longevity compared with standard cotton or poly-cotton spiders. Protection & Fit: Special custom rubber boot magnet covers protect and enhance the appearance of the magnet. A custom Rockville mounting gasket is included for an attractive, airtight installation. The driver uses the highest grade black glue rated for extreme temperatures to increase power handling. Impedance & Specs: Impedance: Dual 4-Ohm voice coils. Frequency Response: 33 Hz - 1.5K kHz Sensitivity: 83dB Cutout Diameter: 11.13 inches Mounting Depth: 6.85 inches 10mm T-Yoke + 10mm Washer Air-Tight High BL Magnetic Motor Gap Enclosure Recommendations: Sealed enclosure volume: 0.8 - 1.25 Cubic Feet Vented/Ported enclosure volume: 1.75 - 3.0 Cubic Feet Physical & Shipping: Weight: 28.67 Lbs. Shipping Weight: 33 Lbs. Shipping Box Dimensions: 14.57" x 14.57" x 10.83" Inches TS Parameters: Fms: 35.7 Hz, Res: 89.4 Ohm, Re: 7.6 Ohm, Qms: 4.60, Qes: 0.61, Qts: 0.54, Rms: 11.8kg/s, Cms: 0.08mm/N, Mms: 242.4 gr, Nref: 0.22%, Bl: 26.1N/A, SPL: 85.3dB, VAS: 30.0 L, Rp: 53.7 Ohm, LP: 48.8mH, CP: 499.5uF, Le: 3.28mH Detailed Mechanical Info: Body: Non-Pressed Paper Gap Plate Inside Diameter: 95mm (3.74 inches) Gap Plate Outside Diameter: 190mm (7.5 inches) Gap Plate Thickness: 25mm (1 inch) Yoke Outside Diameter: 180mm (7.1 inches) Yoke Thickness: 10mm (0.4 inches) Yoke Pole Diameter: 75mm (3 inches) Made in USA: The OFC wire and voice coil construction are made in USA to ensure consistency and durability at this power handling level.