Rockville K6 Series 8" Dual 4-Ohm Car Subwoofer. Peak Power Handling: 1400 Watts. Program Power Handling: 700 Watts. RMS Power Handling: 350 Watts. 2" 4-Layer voice coils (Black Aluminum Former Wound with 100% OFC Copper Wire). Double Stacked 70 Oz Magnet. Cast Aluminum Basket With Black Sanded Finish. Two Chrome-Plated Binding Post Terminals. Black Non-Pressed Paper Cone. Ultra-Stiff cone is extremely thick and strong. Thick Foam Surround Provides Incredible Sound Quality With Minimal Distortion. Black stitching reinforces the cone and ensures long life. Polypropylene (PP) Dustcap. Impedance: Dual 4-Ohm Voice Coils. Vented Holes on T-yoke Enhances Heat Dissipation. Custom Rubber Boot Magnet Cover. Custom Rockville Mounting Gasket makes it Easy To Mount the Subwoofer Air-Tight. High BL Magnetic Motor Gap. 2 layer spider made with thick gauge material that is resistant to tearing. Cutout Diameter: 7.79”inches. Mounting Depth: 4.13” inches. Frequency Response: 44Hz - 1.5kHz. 6mm T-Yoke + 6mm Washer. Sensitivity: 83.4dB. Sealed Enclosure Volume: 0.21-0.6 Cubic Feet. Vented/Ported Enclosure Volume: 0.35-1.0 Cubic Feet. 1-Way XMAX: 15 MM. Weight: 8.82 Lbs.. Shipping Weight: 11.5 Lbs.. Shipping Box Dimensions: 11.41” x 11.41” x 11.81” (2) Rockville W8K6D4 V2 8" 1400w Peak Car Audio Subwoofer Dual 4-Ohm Sub 350w RMS.