The Electro-Voice UW30 30-Watt Omnidirectional Underwater Speaker represents a departure in the design of underwater sound sources. Its unique design, utilizes the case's structural enclosure as the sound transducer. This development makes possible a speaker that has no metal parts exposed to the outside, thus eliminating rust, corrosion or other causes of short life expectancy. The transducer principle and its strong construction allow the UW30 to operate at much greater depths than any prior type of underwater loudspeaker design. The 12. 7 ounce ceramic magnet and state of the art voice coil construction ensure full fidelity response with the lowest possible distortion throughout its power range. The UW30 is equipped with a waterproof, 3 conductor 15. 24m (50 ft. ) cable. The UW30 underwater loudspeaker is designed for permanent installation and completely submerged operation. All internal components are encapsulated with a "hot melt" (Polyamide Copolymer) process. The outer case is constructed of high impact ABS (Acrylonitrile butadiene styrene) plastic. Ideal for installation in both fresh and saltwater pools, the UW30 can even be installed in ocean environments without adverse effect. Problems such as corrosion and electrolysis damage inherent in all or partial metal underwater speakers are completely eliminated by the plastic construction of the UW30. A single model UW30 will deliver uniform sound throughout moderate pools, up to 30 by 30 feet. For larger poo