Polk 10" Subwoofer Ultramarine - White

The Polk Audio 10" Subwoofer Ultramarine in White (model UMS108WR) is a marine-grade subwoofer engineered for serious boaters who demand clean, punchy bass in challenging saltwater environments. Built around a mica-reinforced polypropylene cone and cast aluminum basket, this 10-inch sub handles 350 watts RMS and delivers the kind of low-end response that transforms on-water entertainment—whether you're anchored for the day or cruising offshore.

What sets the UMS108 apart is its construction philosophy: every component is designed to resist corrosion and UV degradation without sacrificing acoustic performance. The polypropylene cone resists salt spray and humidity far better than standard paper cones, while the aluminum basket provides the rigidity needed for tight, controlled bass reproduction even under full throttle. At 350 watts RMS, this subwoofer integrates seamlessly into systems ranging from small center console boats to larger cruising vessels. Dimensioned at 14 x 11 x 14 inches and weighing 17.6 pounds, installation flexibility is built in—whether you're mounting in a dedicated enclosure or retrofitting an existing setup.

Weekend anglers and serious offshore fishermen alike benefit from a subwoofer that doesn't compromise in harsh marine conditions. This isn't a consumer-grade speaker repurposed for wet environments—it's purpose-built marine audio. The white finish blends with modern boat aesthetics while maintaining durability against constant sun exposure and salt air. For boaters upgrading their entertainment system or building a complete marine audio solution, the Polk Audio UMS108WR delivers the reliability and sonic clarity expected from a heritage marine audio brand.