The Kicker KM10 Marine Subwoofer provides 10" of bass that blows away the competition. The KM10 rocks from either a sealed or vented box, while remaining extremely durable in any outdoor climate. The subwoofer's sealed motor, cone, and locking terminal cover make it entirely splash-resistant. Watertight terminal cover itself provides strain relief, insulation, corrosion prevention, and aids in ignition protection. The state of the art molded cone with Santoprene surround, basket, and grille are UV-treated to combat the harsh marine environment. Additionally, the KM10 subwoofer is engineered with the highest level of magnetic shielding available, minimizing compass and gauge deviation in the boat's dash and preventing navigational complications. 4 ohm impedance. 150 watts RMS; 300 watts peak power. Requires 9-5/16" diameter mounting hole.