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3,600-watt Powered Subwoofer with 18″ LF Driver, 2 XLR/TRS Inputs, Omni/Cardioid Modes, DEEP Mode, Adjustable Crossover/Delay, Savable/Recallable Scenes, M20 Threaded Pole Socket, and Swivel Casters

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The QSC KS118 is a high-output active subwoofer well suited for mobile entertainment, AV rental, event production, clubs, and performance venues. The 18" direct radiating driver is powered by a 3600W Class-D amplifier, which delivers high sound pressure levels with dynamic and musical sound reproduction of very-low frequencies.

The on-board DSP allows the user to save and recall variable delay and crossover settings, all the while protecting the system. Additionally, two KS118s can be deployed in a cardioid arrangement, which maximizes low-frequency output from the front, while minimizing energy around the sides and rear of the setup.

The KS118 is highly portable with four, rear-mounted, low-noise casters. The birch enclosure is rugged yet stylish and features comfortable aluminum handles and a top-mounted M20 threaded pole receptacle accepts a 35mm pole for easy vertical deployment with K.2 Series and other full-range loudspeakers.


  • High output with remarkable low-frequency performance
  • 3600W Class-D amplifier module
  • 18" long-excursion direct radiating driver
  • Omnidirectional or cardioid radiation modes (cardioid setup requires min 2 units)
  • Selectable DEEP mode for extremely low-frequency extension
  • Adjustable crossover and delay
  • Scenes for commonly used applications that can be saved/recalled
  • Refined, professional, and elegant appearance in any application
  • Rugged painted wood enclosure for lasting durability
  • Vertical or horizontal deployment (M20 threaded pole receiver for vertical setup)
  • Four low-noise, heavy-duty casters
  • Optional transport cover, temporary weather cover, KS-LOC security cover, and 35 mm loudspeaker pole accessories available
  • Powered/Unpowered: Powered
  • LF Driver Size: 18″
  • Total Power: 3600W Class D
  • Inputs: 2 x XLR-1/4″ combo
  • Outputs: 2 x XLR
  • Frequency Range: 35Hz-111hz (-10 dB)
  • Frequency Response: 41Hz-98Hz (-6 dB)
  • Maximum Peak SPL: 136 dB SPL @ 1m
  • Mounting Options: Floor, Pole
  • Power Source: Standard IEC AC cable
  • Enclosure Material: Birch Plywood
  • Height: 25.2″
  • Width: 20.5″
  • Depth: 30.9″
  • Weight: 104 lbs.
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