The superb audio performance and outstanding durability of Alpine's new Marine product line is based on over 30 years experience in the car audio industry. Inside the boat and/or in the cockpit: Alpine's Marine SPS-M601 / SPS-M601W 16,5 cm 2-Way Coaxial Speaker Systems efficiently implement the output power of Alpine's Marine Head units. The SPS-M601 / SPS-M601W combines superb audio performance with outstanding durability suitable for marine application.