Polk Audio 10" Subwoofer Ultramarine - Silver UMS108SR. 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......

Polk Audio 10" Subwoofer Ultramarine - Black UMS108BR. 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......

Polk Audio 10" Subwoofer Ultramarine - White UMS108WR. 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......