The alto professional ts18s 2500w active subwoofer is a powerhouse when it comes to delivering thunderous bass. With its high efficiency class d amplifier and 18 inch driver equipped with a 3 inch high temperature voice coil this subwoofer is built to provide exceptional low end performance. Designed for durability the ts18s features a rugged internally braced front ported mdf cabinet with a mark resistant splatter spray finish. This subwoofer also incorporates electronic clip thermal and transducer overdrive protection keeping it safe during intense performances. The user selectable eq tunings and phase alignment selector switch allow you to fine tune your sound for optimal performance in any venue. With its 2500 watts of power the ts18s is alto professionals most powerful subwoofer yet. It delivers a deep controlled low end presence that brings any musical performance to life. The ts18s seamlessly fits into any sound system. Its onboard electronics switches allow you to customize the low end accentuation while the dedicated input and output paths make it easy to connect to other speakers.