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Polk Audio UMS77S Marine Speakers 7.7" Anthracite. Polk's Ultramarine speakers are designed to deliver maximum sound in marine applications. The innovative design features "air suspension" technology and high-temperature voice coils with power up to 200 watts. These 7.7-inch speakers feature durable, removable sport grilles that withstand sunlight and moisture. The Polk UMS77S speaker uses air suspension technology to provide 200 watts of power in a sleek, waterproof, and corrosion-resistant package. Ideal for water installations.
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