QSC KS118 18" 3600W Active Subwoofer

The QSC KS118 is a compact yet commanding powered subwoofer engineered to deliver clean, musical low end for mobile entertainers, houses of worship, clubs, and rental rigs. At its core is an 18-inch subwoofer with a long-excursion, direct-radiating design, driven by a 3600W Class-D amplifier that provides serious headroom for modern program material. Optimized DSP unlocks selectable DEEP mode for extended low-frequency impact and supports cardioid deployment when you run a cardioid sub array with two units, tightening front-of-house punch while reducing stage wash. The rugged birch plywood cabinet rides on four low-noise casters and features an M20 threaded pole receiver for rock-solid vertical stacks with compatible tops.

Control is fast and repeatable. Save and recall scenes, set delay and crossover points, and let QSC’s Intrinsic Correction protect and smooth the response. A pair of locking XLR/TRS combo inputs and dual XLR loop-thrus simplify integration with popular mixers and loudspeakers. The KS118 reaches a powerful 136 dB SPL peak while maintaining clarity, making it a natural fit for portable PA systems that need authoritative bass without a truckload of boxes. Dimensions are 25.2 × 20.5 × 30.9 inches (H×W×D); net weight is 104 lb including casters—manageable for a sub that delivers stadium-style thump.

From live bands and DJs to corporate AV and education, the KS118 brings touring-grade low end with quick setup, smart DSP, and a flexible physical design. Use DEEP mode for more low-frequency extension, deploy omni for broad coverage, or array two subs in cardioid to keep energy where the audience is. Built for the road and tuned for real-world rooms, this is the single-box bass solution that earns its keep night after night.