QSC KS118 Active 18" Subwoofer

The QSC KS118 is a high-performance active subwoofer engineered for professional live sound, mobile entertainment, AV production, clubs, and performance venues. At its core is an 18-inch direct radiating driver powered by a 3600-watt Class D amplifier, a combination that delivers exceptional sound pressure levels while maintaining the dynamic, musical character that distinguishes quality subwoofers from those that merely produce volume. The integrated DSP handles system optimization and driver protection automatically, while also providing user-accessible features including adjustable crossover, delay settings, and the selectable DEEP mode for extended low-frequency output when the application demands it.

One of the KS118's most valuable professional features is its ability to pair two units in a cardioid array configuration through the on-board DSP, focusing bass energy toward the audience while significantly reducing low-frequency energy behind the subwoofers. This is a critical capability for stages, houses of worship, and venues where controlling bass spill is important. The rugged enclosure is built for touring and daily use, with four integrated low-noise casters and multiple handles that make the 104-pound unit practical to move and position. An M20 threaded pole receptacle on top accepts standard 35mm poles for deploying full-range loudspeakers above the sub, and the optional KS-LOC security cover can prevent unauthorized access to rear-panel controls in permanent installations.