Item #1517901 Model #KS118-NA

QSC KS118 3,600W 18" Powered Subwoofer Standard


In Stock
Pickup In-Store
Save to Wishlist

Deep, chest-thumping bass for any live sound application.

The QSC KS118 active subwoofer delivers high-output, low-frequency performance for mobile entertainers, clubs and live venues. Featuring an 18" driver and 3,600-watt Class D amplifier, the KS118 produces tight, musical bass with plenty of headroom. Onboard DSP provides total system control, allowing you to choose between omnidirectional or cardioid radiation patterns. Activate the KS118's DEEP mode and redirect more power to the lowest frequencies for dance music that hits you in the chest.
3,600 Watts of Deep, Impactful Bass
With 3,600 watts of power driving an 18" long-excursion driver, the KS118 delivers deep bass extension and high sound pressure levels. Whether you need to reproduce the thumping kick drum and bass lines of electronic dance music or provide a solid low-end foundation for a full-range PA, the KS118 has the output and frequency response required for any live sound application.
Onboard DSP Offers Complete Control
The KS118's onboard DSP provides system optimization, protection and advanced capabilities like selectable radiation patterns. Choose between omnidirectional mode for broad, even coverage or cardioid mode to focus low-frequency output in one direction. The cardioid mode requires two KS118 units but can help reduce unwanted bass buildup on stage. Adjustable crossover points, delay and EQ allow you to perfectly match the KS118 to your main PA speakers.
Selectable DEEP Mode for Extra Low-End Punch
When you need extended low-frequency response for electronic dance music or hip hop, activate the KS118's DEEP mode. In DEEP mode, the onboard DSP redirects more amplifier power to the lowest frequencies, boosting output below 40 Hz for chest-thumping bass you can feel. DEEP mode gives your audience the full impact of modern music by reproducing deep bass that's often missing from underpowered PA systems.
Built for Professional Use
Like all QSC products, the KS118 is built to rigorous standards for professional live sound. Its rugged birch enclosure, durable steel grille and robust internal components are made to withstand the demands of frequent transport and high-output use. Ergonomic handles and heavy-duty casters make loading and setup efficient, allowing you to get the KS118 where you need it quickly. A standard M20 threaded pole socket gives you flexible deployment options for your subwoofer and main PA speakers. Order the QSC KS118 subwoofer today.
Speaker Configuration
  • Active/passive: Active
  • Type: Direct-radiating subwoofer
  • LF driver: 18"
  • MF driver: Not applicable
  • HF driver: Not applicable
  • Amplifier class: Class-D
  • Wattage: 3,600W peak
  • Mixer/preamp: Not applicable
  • Frequency response: 35Hz–111kHz
  • Coverage pattern: Omnidirectional
  • Max SPL: 136dB
  • XLR: 2
  • XLR: 2
  • Cabinet material: 18 mm birch plywood
  • Width: 20.5"
  • Height: 25.2"
  • Depth: 30.9"
  • Weight: 104 lb.


  • 3,600W Class-D peak amplification
  • 18" direct-radiating driver
  • Rugged birch plywood cabinet with smooth-rolling casters
  • Onboard DSP with DEEP mode