M600/1 Monoblock Class D Marine Subwoofer Amplifier, 600W;ETXv3 is the ultimate tower speaker system, delivering superb sound quality, with strong projected output. Each enclosure is precision-molded with our proprietary marine-grade polymer for outstanding durability in real marine conditions. Available in white or black with 7.7-inch (M3 or M6) speakers or with 8.8-inch M6 speakers. RGB speaker lighting is optional. Mounting fixtures are sold separately and available to fit a wide range of pipe diameters and boat specific applications.