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QSC KS212C Powered 3600W Dual 12" Cardioid Subwoofer

BH #QSKS212C • MFR #KS212C
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QSC KS212C Powered 3600W Dual 12" Cardioid Subwoofer
Key Features
  • For Bands, Bars, and Mobile Entertainers
  • Compact Single-Box Cardioid Solution
  • -15 dB SPL Front-to-Rear Attenuation
  • 2 x 12" Woofers
Are you looking for a portable, easy-to-use cardioid subwoofer? Then look no further than the dual 12" QSC KS212C, a single-box powered cardioid subwoofer solution for mobile entertainers, AV production, and rental professionals as well as modestly sized performance venues. The subwoofer features a 3600W Class-D amplifier module that powers two 12", long-excursion drivers in a dual 6th order band-pass design that creates a cardioid polar pattern with -15 dB SPL front-to-rear attenuation. The unit offers a frequency response of 44 to 104 Hz (-6 dB) with a peak SPL of 132 dB (at 1m).
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QSC KS212C Overview

Are you looking for a portable, easy-to-use cardioid subwoofer? Then look no further than the dual 12" QSC KS212C, a single-box powered cardioid subwoofer solution for mobile entertainers, AV production, and rental professionals as well as modestly sized performance venues. The subwoofer features a 3600W Class-D amplifier module that powers two 12", long-excursion drivers in a dual 6th order band-pass design that creates a cardioid polar pattern with -15 dB SPL front-to-rear attenuation. The unit offers a frequency response of 44 to 104 Hz (-6 dB) with a peak SPL of 132 dB (at 1m).

Typically, subwoofers are omnidirectional, radiating in all directions. This results in a build-up of low frequencies on-stage and wasted LF energy at the rear of the system. Sound engineers found a way to create a cardioid (heart-shaped) polar pattern, which removes much of the low energy at the rear of the subwoofers. Unfortunately, this system required the use of subwoofer arrays with multiple enclosures, clever placement, and processing of delay and polarity to redirect the energy.

The KS212C provides all the benefits of a cardioid subwoofer array, but without the headache of multiple enclosures and outboard processing. The single subwoofer can be deployed in a vertical or horizontal position and features M20 speaker pole fittings in either position, while the 15mm Baltic birch enclosure features a rugged paint designed for long-life and lasting durability. The rear panel offers a LCD control module with variable crossover and savable and recallable scenes as well as Intrinsic Correction tuning and loudspeaker management. There are two combo XLR-1/4" inputs and two XLR "Pass-Thru" outputs. The KS212C ships with a locking IEC power cord.

  • Compact single-box cardioid solution
  • 3600W Class-D amplifier module
  • Cardioid pattern provides -15 dB SPL front-to-rear attenuation
  • Dual 12", long-excursion drivers; dual 6th order band-pass design
  • Variable crossover and savable/recallable Scenes for commonly used applications
  • Intrinsic Correction tuning and loudspeaker management
  • Refined, professional appearance looks great in any application
  • Rugged painted wood enclosure for long life and lasting durability
  • Deployment in either vertical or horizontal positions with M20 speaker pole fittings in either position
  • Optional KS-LOC security cover prevents unauthorized tampering of controls
  • Complete EASE & CAD information available online
  • Limited 6-year warranty
UPC: 684284066763

QSC KS212C Specs

Key Specs
Frequency Range/Response
39 Hz to 118 Hz (-10 dB)
44 Hz to 104 Hz (-6 dB)
Speaker Type
Active Subwoofer
Enclosure Type
Bandpass Cardioid
Total Output Power
3600 W Peak
Amplifier Class
Class-D
Drivers
LF Driver
2x 12" / 30.5 cm Cone
Performance
Frequency Range/Response
39 Hz to 118 Hz (-10 dB)
44 Hz to 104 Hz (-6 dB)
Maximum SPL
132 dB (Peak)
Signal Processing
Crossover Frequency
80 / 100 Hz
EQ & Filters
LF Boost, Low-Pass Filter
Digital Signal Processing
Crossover, Delay, Subwoofer Throw Pattern, User Settings, Venue Settings, Voicing Modes
Connectivity
Audio I/O
2x Combo XLR-1/4" TRS Input
2x XLR 3-Pin Thru/Output
Network I/O
No
USB I/O
No
Wireless
No
Mobile App Compatible
No
Power
AC Input Power
100 to 240 VAC, 50 / 60 Hz
AC Power I/O
1x IEC (Locking)
Physical
Color
Black
Mounting
2 x M20-Threaded Pole Socket (Side, Top)
Handles
1x Top
Construction Material
Plywood
Environmental Resistance
No
Dimensions
24 x 15 x 33.5" / 609.6 x 381 x 850.9 mm
Weight
88.4 lb / 40.1 kg
Packaging Info
Package Weight
109.85 lb
Box Dimensions (LxWxH)
38 x 27 x 20"

QSC KS212C Reviews

Game changer for mobile gigs

By Justin
Rated 5 out of 5
Date: 2026-04-14

Admittedly I went back and forth with myself about whether to make this purchase. I am so glad that I finally did so. While the applications for this sub are very specific, it has been a valuable addition to our mobile equipment and a great alternative to lugging around the KS118s that we had been using for mobile gigs. It has a great punch, especially for its size, and integrates easily with the rest of our QSC gear.

Sound Dynamics

By Big E 10-4
Rated 5 out of 5
Date: 2018-01-19

This is a subwoofer with directional sound quality in mind from the get go. After having the new K.2 12" speakers for almost 3 months, I knew that the bottom was missing something more than a lot of bass. A long awaited preorder for this mammoth speaker finally was delivered. A simple cross-check to made some adjustments to tell the floor speakers that a sub was in the mix, set the tone for a listening experience. After a song list was sent to the mixer to play, I was totally happy with the sub output not overpowering the mid/highs. It was a clean and crisp balance of audio dynamics in the higher volume levels, even for different genres of music. Mine came with the black 36" extension pole to mount the K12.2 speaker above. Waiting for the protective padded travel case that was just ordered. Was also quieter behind the sub than the front.

See any errors on this page?

question

Does this product include the QSC K Series Pole Extension in the box?
Asked by: Andrés
Yes it does and was told from the MFG that you can place the K12.2 speaker on it, not just the 10 or 8 series. the pole measures 36 inches in color black.
Answered by: ERIK S.
Date published: 2018-08-27
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