Produce unparalleled bass sound in the marine environment with this MS-SW10 Free Air 10" Waterproof Subwoofer from Fusion. Improves the overall sound quality and depth of your stereo system. The Fusion MS-SW10 subwoofer's waterproof design protects it from the marine environment. MS-SW10 features 400 watts maximum power. Requires an amplifier for optimal power output.