QSC KSUB 12 Inch 1000 Watt Active PA Subwoofer Loudspeaker

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Product Description

We can’t actually verify that Thor had anything to do with the design of QSC’s KSub powered subwoofer — but it sure sounds like he did! Packing a thunderous low-end punch into a compact, easily transportable package, the dual 12 inch, 1000 watt KSub is ideal for bands, DJs and permanent installations where extended low frequencies are required. And if space is at a premium, the 26” x 14” KSub can be turned on its side to easily fit under a stage riser in a small club or bar. QSC’s Proprietary DSP also makes for simple, reliable integration with your current system.

Pairing the KSub with active loudspeakers from QSC’s groundbreaking new K.2 series or just about any full-range speaker will greatly enhance your system’s overall sound without breaking your budget — or your back, thanks to its lightweight Class D amplifier and 3 inch, heavy-duty low-noise casters. The KSub’s premium birch construction and QSC’s stringent endurance testing ensure that the KSub will be a reliable road warrior for years to come.

Purchase a K.2/KW Series Amplifier from AMS and Receive QSC's
QSC 6 Year Extended Warranty
after registering your product at

QSC KSUB Powered Dual 12 Inch Subwoofer Features
  • 1000 watt Class D power module
  • Dual balanced female XLR / 1/4 inch line level input
  • Dual Balanced male XLR full range line level out
  • Attractive and professional appearance
  • Rugged ABS enclosures
  • Tour-grade 18 gauge steel grilles
  • Ergonomic handles with comfortable, non-slip grip
  • Casters and pole mount (pole included)
A Powerful Reputation
QSC first made its name as one of the industry’s premier power amplifier manufacturers. So it should come as no surprise that the KSub features a super-clean, ultra-lightweight, highly-reliable, 1000-watt Class D power module. Enjoy peace of mind knowing your KSub is driven by an amplifier from a legendary company with 50 years of experience in the field.

Speaking of Excellence
Unlike other compact subwoofers, the QSC KSub incorporates not one, but TWO 12 inch drivers. Coupled with the aforementioned 1000-watt Class D amplifier, this “little giant” is capable of achieving a 48 Hz - 134 Hz frequency response (-6dB) at a maximum SPL of 130 dB (peak).

Hooking Up
The KSub’s rear panel features two Line inputs, each equipped with a combo XLR/Balanced TRS 1/4” jack and passive Line Outs on XLR jack for daisy-chaining additional powered subs or full-range speakers. There’s also a Phoenix-style Euroblock connector for integrating an external potentiometer — useful for install situations where you may need to control the gain of multiple daisy-chained K-Series speakers remotely.

Additional Rear Panel Features
Set the MODE switch to NORMAL for no effect, or choose DEEP for additional bass extension. Flip the PHASE switch from NORMAL to REVERSE to solve phase cancellation issues in sonically-challenged rooms or to better match the internal wiring of other speakers.

The LED switch selects which mode the front-mounted LED indicates. Choose from POWER to tell at a glance if the KSub is powered on; LIMIT to monitor when the clip limiter circuit has been engaged; or OFF for situations where you don’t want the LED to be illuminated at all.

A three-LED array on the rear panel indicates POWER, LIMIT or STANDBY (Auto-Standby mode kicks in after 5 minutes of inactivity). There’s also a Master GAIN control with LED to indicate when SIGNAL is present.
Road-Ready Construction
The QSC KSub is designed to endure the rigors of the road for years to come. Its cabinetry is constructed of premium-grade Baltic birch and finished with a chip and scratch-resistant textured paint. You’ll find the cast aluminum handles to be comfortable and ergonomic. And KSub’s 3 inch, heavy-duty, low-noise casters will make your load-in and load-out a breeze. There’s even a wobble-free connection for a threaded speaker pole (included).

Integrated Protection
QSC's GuardRail™ technology protects your KSub’s woofers from over-excursion and excessive heat — the primary causes of voice coil burnout. There’s also an on-demand cooling fan on the rear panel and internal thermal limiting circuitry to prevent the electronics from overheating.

Don’t forget to cover up!
With a subwoofer of this caliber, you want make sure that it’s protected from dirt, dust, the elements, and the regular wear that occurs during transport and storage. The QSC KSub Powered Subwoofer Cover (sold separately) is made with weather-resistant Nylon/Codura material and includes a convenient front storage pouch emblazoned with the QSC logo. Store your cables and accessories while protecting your KSub!

Product Specifications
QSC KSUB Powered PA Subwoofer Specifications
  • Configuration: 4th Order Bandpass
  • Transducers: 2 x 12 inch cone transducers
  • Frequency Response (-6 dB): 48 Hz - 134 Hz
  • Frequency Range (-10 dB): 44 Hz - 148 Hz
  • Maximum SPL: 130 dB peak
  • Power Output:
    • 1000 W continuous Class D (2x500 W)
    • 2000 W peak
  • Input Impedance (ohms): XLR / 1/4 inch: 40k balanced / 20k unbalanced
  • Controls: Power, Gain, LF Mode (Normal/DEEP), Polarity (Normal/Reverse), Front LED (On/Off/Limit)
  • Indicators: Power, Signal, Standby, Limit
  • Connectors:
    • Dual balanced female XLR/1/4 inch line level input
    • Dual Balanced male XLR full range line level out
    • Remote gain control
    • Locking IEC power connector
  • Cooling: On demand, 50 mm variable speed fan
  • Amplifier Protection: Thermal limiting, output overcurrent, overtemperature muting, GuardRail
  • Transducer Protection: Thermal limiting, excursion limiting
  • AC Power Input: Universal power supply 100 - 240 VAC, 50 - 60 Hz
  • AC Power Consumption:
    • 100 VAC, 2.3 A (1/8 Power)
    • 120 VAC, 2.01 A
    • 230 VAC, 1.13 A
  • Enclosure:
    • Material: Painted birch plywood
    • Finish: Black textured paint
  • Dimensions (HxWxD): 26 x 14 x 28.1 inches (665 x 356 x 714 mm)
  • Weight: 74 lb / 33.6 kg
Helpful Info about the Manufacturer
Phone:  800-772-2834 Warranty:  3 Years; 1 Year on TouchMix; B-Stock is 1 (one) Year only!
Manuel Garcis Submitted: 4/5/2018
Product Rating brightstarbrightstarbrightstarbrightstarbrightstar
I love this thing
Product Rating
What is your opinion of this product?
Good subwoofer
PantherCity DJ Submitted: 6/29/2017
Product Rating brightstarbrightstarbrightstarbrightstarbrightstar
Arrived on time; minor damage
What is your opinion of this product?
Matches well with my K12s and gives the appropriate bass response for "listenable" music play/mobile DJ applications. Arrived with a small scratch to the facade but I had a gig the next day; product exceeded my expectations. If I ever do sound for a small band these will work - larger bands may warrant going with 18s.
Mark R. Williams Submitted: 6/9/2017
Product Rating brightstarbrightstarbrightstarbrightstarbrightstar

I love the shape of the cabinet.
What is your opinion of this product?
I think the quality of sound outweighs the fact that it's not 18" sub.
12 Payments! 0% Interest!
12 Payments! Ltd Time!
No Special Credit Card Application - 0% Interest! Your credit card will be billed in 12 equal payments, every 31 days, starting on the day your order is shipped. 12 Payment plan will need credit approval.
0% Interest Payment Plans

12 Payments of
$971.95 - $1,079.99
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