Craving more power from your PA system? Add a subwoofer that delivers. The Thump18Sv4 shakes the floor with deep, room-filling bass that gets the crowd moving and keeps them there. Connect loudspeakers. Dial in the perfect low end. Feel the difference of a professional subwoofer that brings music alive with complex basslines and punchy kicks.A True Workhorse for Gigging ProfessionalsFeatures a 1400W Class-D amplifier for 132 dB maximum SPL, an 18-inch high-performance woofer for 33 Hz low frequency response, and a Built-Like-A-Tank design that conquers every gig while remaining lightweight with built-in handles for easy loading.Tailor the Bass to Your LoudspeakersConnect loudspeakers to high-pass outputs and select from four modes with 1.4 ms alignment delay, including Thump 12 for Thump12v4 loudspeakers (140 Hz crossover), Thump 15 for Thump15v4 loudspeakers (110 Hz crossover), Thump GO for Thump GO loudspeakers (150 Hz crossover), and Variable mode for manual crossover adjustment to match any loudspeakers.Connect to Versatile Inputs and OutputsWith stereo XLR inputs for DJ controllers, mixers, or other sources, stereo XLR high-pass outputs for connecting loudspeakers with selectable high-pass modes, and stereo XLR full-range outputs for chaining the full, unaltered signal to the next subwoofer.Essential Subwoofer FeaturesIncludes phase invert switch, defeatable front LED, stereo or mono summing for single or dual subwoofer deployment, variable level control from muted to +6 dB, and front LED on/off control for flexible system setup and operation.Physical FeaturesBuilt-in handles and rugged modern construction designed for durability and easy transport in demanding live sound environments.