QSC KS212C K Cardioid Active Subwoofer Speaker (3600 Watts)

Aim the bass where you need it with QSC's KS212C powered sub. With just a single unit, this cardioid subwoofer outputs 15 dB more from the front of the cab.

The KS212C subwoofer represents the world's first-in-class single-box powered cardioid subwoofer solution for highly portable entertainment and installation applications.

A breakthrough in innovation and design, the 3,600 Watt KS212C subwoofer uniquely provides all the benefits of cardioid deployment in a single, compact enclosure. "Keeping bass in its place" for mobile entertainers, AV production and rental professionals, as well as modestly-sized performance venues, the KS212C subwoofer is unparalleled in its ability to manage low frequencies on the stage, or any application where undesirable low frequency energy needs to be minimized.


- 3600-watt Class D power module
- Dual 12-inch long excursion drivers; Dual 6th order band-pass design
- 15 dB SPL attenuation front-to-rear
- Two M20 threaded sockets (one on top, one on side) accept 35 mm speaker pole
- Four low-noise, heavy-duty casters
- Speaker pole included
- Size: HxWxD = 24.5" x 15.5" x 33.5" (622 x 394 x 851 mm)
- Weight: 88.5 lbs (40.1 kg)

Compare all QSC's KS series powered subwoofers in this video overview:
WARNING: Cancer and Reproductive Harm - www.p65Warnings.ca.gov.

Configuration: Dual 6th-order bandpass cardioid subwoofer
LF Transducer: 2 x 12" (305 mm), cone
Frequency Range (-10 dB): 39 Hz - 118 Hz
Nominal Coverage Angle: 180 degree Cardioid (15dB rear rejection @ 70Hz)
Maximum Rated SPL1: 132dB @1m, peak
Amplifier: Class D, 2 x 1800W (peak)
Cooling: Low-noise, variable speed fan
Controls: Power, Gain, Rotary encoder, 2 x selection buttons
Indicators: 2 x Power LED (front and rear)
Input Signal: LED
Limiter active: LED
Connectors: 2 x locking XLR/F 1/4" combo, 2 x XLR/M (Loop-thru Output), 1 x locking IEC power connector
AC Power Input: Universal power supply 100 - 240 VAC, 50 - 60 Hz
AC Power Consumption: 1/8th power
Enclosure: 18mm birch plywood
Color: Black (RAL 9011)
Grille: Internal woofer cover
Dimensions (HWD) inches: 24.5" x 15.5" x 33.5"
Dimensions (HWD) mm: 622 mm x 394 mm x 851 mm
Net Weight: 40.1 kg (88.5 lbs)
Regulatory: CE, WEEE, UL, CHina RoHS, RoHS II, FCC Class B
Optional Accessories: KS212C Cover, KS-LOC Lock-Out Cover
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 107 lbs
Shipping Dimensions: 38 x 26 x 20 in
Manufacturer Part Number (MPN): KS212C
Blemished, USED
Shipping Weight: 107 lbs
Shipping Dimensions: 38 x 26 x 20 in
Manufacturer Part Number (MPN): KS212C

For support or warranty questions, please contact the manufacturer:
Phone: 800-772-2834
Web: http://qsc.com/support

Reviewers gave this product an overall rating of 5 out of 5 stars. (7 ratings)
Submitted April 27, 2019 by Stephen W in Wallingford, CT

"Blown Away"

Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
I have owned several sub in the past. ETX 18SP, Qsc HPR 181, KSUB, JBL PRX18. As an event DJ I often would have smaller venues that the ETX (15, 18 SP) could not fit. So, I moved to the Evole 50 system (pair). These systems work great up to about 300. Bass is reasonable. No earthquake level. However, I was looking for something that was small enough to fit in small suv that packed punch of the Kw181, that would harmonically balance with the evolve 50’s.I tested crossover at both 8o and 100 hz and found 80 to be the tightest and clean bass. While running the system and 12:00 o’clock position with Mxc8000 the run would rattle the pictures on the wall and anything loose close by. This happens even at lowers levels. More ouch and headroom than the ETX 18SP. The limit light would come on on the ETX with hip hop and R /B. Music. Not so on this KS212C (Lots of headroom with 3600 watts). So if you need a KW kick in an small portable package this is the one to beat!Thank zZounds for having my back and the best plans!

Musical Background:

30 years, Drummer, Event DJ, Producer

Musical Style:

Rock, Hip Hop R/B Christian, House all genres.
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