Skip to main content
Play Video

QSC KS118 3,600W 18" Powered Subwoofer

$1,999.99 1899.99 $1,899.99 Save $100.00 (5%)
40 $40/mo. with 48 months financing*
Limited time Learn more
More ways to pay:
Lease-to-own with Progressive Leasing. Learn more
Loyalty Points Icon
Loyalty Points Icon
Earn 15,200 reward points
($152.00 in credit)
Earn 15,200 reward pts.
($152.00 in credit)
Inventory Msg Check Mark Inventory Msg Exclamation In Checkout Promo Inventory Msg Download Icon
In Stock & Ready to Ship
Most orders placed before 3 p.m. ET ship same day (except weekends and holidays). This oversized item has special shipping requirements.
  • Free Shipping
  • Top Rated
  • Top Seller
  • Flexible Financing
Product Warranties Icon Product Warranties Icon

Gold Coverage Protection

Protect your gear

Chevron Right Icon
Open Box:

Class-D amplification with 3,600W peak output.

The QSC KS118 is a very high-output active subwoofer producing impressive low frequencies for mobile entertainment, AV rental, event production, clubs and performance venues. Featuring an 18" direct-radiating driver powered by a 3,600W Class-D amplifier, the KS118 delivers high sound-pressure levels with dynamic and musical sound reproduction of very low frequencies.

Onboard DSP optimizes and protects system performance while also offering advanced capabilities, such as the ability to array two units in a cardioid arrangement, maximizing low-frequency output in front while minimizing unwanted energy around the sides and rear of the system. Users can select DEEP mode for extremely low-frequency extension. In DEEP mode, the KS118 redirects more amplifier power to the lower end of the frequency range, which gives the deepest part of your music a lot more punch.

Weighing in at only 104 lb., the KS118 is surprisingly easy to maneuver and load. This is due, in large part, to ergonomic aluminum handles and rear-mounted, low-noise casters. A top-mounted M20 threaded pole receptacle accepts a 35 mm pole for easy vertical deployment with K.2 Series and other full-range loudspeakers.

Just like its predecessor, the KW181, the KS118 active powered subwoofer lives up to QSC’s reputation for quality workmanship and reliability. It features a rugged birch cabinet, robust hardware and internal components, and tough steel grille to protect the driver. Make no mistake—the KS118 is built for professional use.

Mobile DJs will appreciate the powerful output of this rugged subwoofer. Much of today’s popular dance, electronic and hip-hop music relies heavily on ultradeep bass. Whether you’re DJing a wedding, corporate event or spinning in a night club, modern music demands a professional subwoofer. A portable PA system without a powered sub isn’t faithfully reproducing the music the way it was intended. Giving your audience the bass they want to hear and feel requires a quality subwoofer. A live sound system isn’t complete without it.


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

Give your sound system the bass it has been missing—order today.


KS118 3,600W 18" Powered Subwoofer Specifications:

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.

Questions & Answers

Do you have questions about this product?

Shop with a Friend
Free Shipping
  • Free Standard Ground shipping (48 contiguous states, some overweight and Used/Vintage items excluded).
  • Orders placed before 3 p.m. ET usually ship the same business day.
Learn More
2-Year Free Warranty on Guitars

Every guitar or bass you purchase from Musician's Friend (electric or acoustic, New or Open Box) includes two years of protection from manufacturer defects.

Contact Us for Details
We're Here for You

Our Gear Advisers are available to guide you through your entire shopping experience. Call or Chat for expert advice and to hear the latest deals.

Contact Us
Proactive Advisor Support Chat