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Image for KS118 Active Subwoofer from SamAsh
Image for KS118 Active Subwoofer from SamAsh
Image for KS118 Active Subwoofer from SamAsh
Image for KS118 Active Subwoofer from SamAsh
Image for KS118 Active Subwoofer from SamAsh
Image for KS118 Active Subwoofer from SamAsh
Image for KS118 Active Subwoofer from SamAsh
Image for KS118 Active Subwoofer from SamAsh
Image for KS118 Active Subwoofer from SamAsh
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QSC KS118 Active Subwoofer

KS118 Active Subwoofer with a 3600-Watt Class-D Amplifier, 18-Inch Long Excursion Direct Radiating Driver, Selectable DEEP Mode, Omni-Directional or Cardioid Radiation Modes, Adjustable Crossover and Delay.


(8 reviews)

Discounted Price $1,499.99 MSRP: Old Price $1,799.99 Save : $300.00 (17%)
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*Used/B-Stock Gear:

MSRP: Old Price $1,799.99 Discounted Price $1,499.99 Save : $300.00 (17%)
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The KS118 is a very high-output active subwoofer producing impressive low-frequencies for mobile entertainment, AV production, clubs, and performance venues. Featuring an 18-inch direct radiating driver powered by a 3600-Watt Class-D amplifier, the KS118 delivers high sound pressure levels with dynamic and musical sound reproduction of very low-frequencies. On-board DSP optimizes and protects system performance as well as offers advanced capabilities such as the ability to array two units in a cardioid arrangement. Highly transportable, the rugged enclosure features comfortable handles and four low-noise casters. An M20 threaded pole receptacle accepts a 35 mm pole for easy vertical deployment with full-range speakers.


  • Very high output with impressive low-frequency performance
  • 3600-Watt Class-D amplifier module
  • 18-inch (460 mm) long excursion direct radiating driver
  • Omni-directional 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, KS-LOC security cover and 35 mm loudspeaker pole accessories available

Get your QSC KS118 Active Subwoofer today at the guaranteed lowest price from Sam Ash with our 45-day return and 60-day price protection policy.

Things You Will Get:

  • Subwoofer

Worth it.


This was worth every penny. Really makes the sound so much better.



Planning on getting another one


Amazing sound .



We add subs for that "feeling"....these deliver all the feel


I was looking for a sub to compliment my K12.2 tops. I originally purchased the KS212C and was very pleased with the performance. But, I just wasn't getting that punch I wanted. I exchanged it for the KS118 and couldn't believe how much more punch and heft it delivered. It's not a minor difference but a major difference. I very happy with my purchase and will enjoy this beast for several years to come! If you're considering the KS212C for the cardioid function or portability, I understand. Just know this....they don't compare when it comes to performance!


Winter Garden, FL



I was extremely excited about this sub, but it didn't meet the standards that I expected from it



All that


My experience with Sam Ash was good. Got the speaker when I was told. The speaker itself is all that.



The best subwoofer ever I had as a professional Dj


I used to have two JBL subwoofers for my DJ gigs Now I am using only one KS118 and the sound is amazing paunch and clear my clients are loving it and gives me lots of compliments how good the sound is The best subwoofer ever i been Djing for 10 year brought lots of other brand subwoofers but this is the best ever Loving my new QSC ks118



I would recommend this SUB it's well with the cost


This QSC Subwoofer is awesome! So much base response in a package that will fit in my SUV. I use it for a 4 piece club band and it gives us all the low end we need.



I would buy this product again.


This Subwoofer by far is one of the best sounding in your chest subs I've ever owned. Replace the KW 181's which done a fantastic job, but this has 3800 peak performance power that sound clean, no muddy bass. Kick drum and floor toms sound awesome. Recommend to all, QSC products are uno in my book. Great job QSC..



KS118 Active Subwoofer

4.8 8


Powered Yes
Inputs 2 x locking XLR/F ¼ inch combo
Outputs 2 x XLR/M (Loop-thru Output) 1 x locking IEC power connector
Frequency Range 35 Hz - 111 Hz
Power Class Class-D
Maximum SPL 136 dB
Coverage Angle Omni-directional or cardioid radiation modes
LF Driver Size 18"
LF Driver Material Birch Plywood
LF Amplifier Power 3600-Watt (peak)
Power Rating 3600-Watt (peak)
Power Supply Type Universal power supply 100 – 240 VAC, 50 – 60 Hz
Weight 104 lbs
Dimensions 25.2 x 20.5 x 30.9 inches (HxWxD)
Series Ks Series
Model KS118
Warranty Info:

QSC warrants the QSC-manufactured hardware, products, and accessories contained in the original packaging ("QSC Product") against defects in materials and workmanship when used normally in accordance with QSC's published guidelines for a period (“Warranty Period”). The Warranty Period is the greater of (i) three (3) years from the date of purchase, or (ii) the maximum period required under the local laws where the QSC Product is purchased.  QSC's published guidelines include but are not limited to information contained in technical specifications, user manuals, and service communications.  QSC is not responsible for any damage or injury arising from failure to follow instructions relating to the proper use of any QSC Product.  

Notwithstanding the foregoing, the Warranty Period for QSC TouchMix is the greater of (i) one (1) year from the date of purchase, or (ii) the maximum period required under the local laws where QSC TouchMix is purchased.

The most up-to-date version of this warranty statement may be found @

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