Polk Audio 10" Subwoofer Ultramarine - Black. These Subwoofers by Polk Audio use air suspension technology in the woofer to provide stronger bass response with waterproof UV and corrosion-resistant protection. The Polk Audio 10in Svc Subwoofer has an advanced WRATX voice coil that allows it to perform in the most punishing conditions making it the perfect choice for your boat. The Polk Audio Svc 10in Svc Subwoofer is sealed making it waterproof UV and corrosion-resistant making it the perfect choice for life on the water. Specifications for Polk Audio 10" Subwoofer Ultramarine: Manufacturer: Polk Audio Water Resistance Level: None Quantity: 1 Features of Polk Audio 10" Subwoofer Ultramarine Watts: 700 Waterproof: No QTY: Single Mounting Style: Flush Package Contents: Polk Audio 10" Subwoofer Ultramarine Polk Audio UMS108BR: 10" Subwoofer Ultramarine - Black