Powder Coated Cast Aluminum Frame – to withstand extreme environmental use. Designed to accept optional RGB wiring. Injection Molded Composite Cone – For durability & low distortion. Rubber Spider – Much more durable to water & temperature changes than a traditional treated Cotton Spider used by the majority of marine speakers & subwoofers. Rubber Surround – Offers a superior bond to the composite cone. Gold Plated Terminals – Designed to resist corrosion. Impedance: 4 ohms RMS Watts: 500 PEAK Watts: 1000 Frequency Response: 20Hz to 400HZ Sensitivity: 88 db at 1watt/1 meter Weight: 17.6 lbs (7.98kg) Diameter: 12.6 inches (320.04mm) Mounting Depth: 4.92 inches (124.96mm) Hole Cut Out: 11.26 inches (286.00mm) Vented Enclosure: 1.7 cu ft (Optimum: Tuned at 41 Hz) Box Specs Optimized for Infinite Baffle (Free Air) applications or 1.3 cu ft sealed enclosure Grills Sold Separately