Embrace your sophisticated madness with Polk Ultramarine. We believe your boat should reflect who you are: refined with a wild side. Polk Ultramarine specializes in stylish, high performance audio that takes your boat to the next level. Our feature-rich modular source units are designed to save space while maximizing functionality and our speakers deliver premium quality sound at top volume. All our products are built with waterproof, UV, and corrosion resistant materials to withstand life on the water. With Polk Ultramarine, you can keep the party going all day long.