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KS212-C Cardiod Subwoofer


This item is not available for purchase online. Please call (513) 843-5739 to order.

Product Highlights

  • For Bands, Bars, and Mobile Entertainers
  • Compact Single-Box Cardioid Solution
  • -15 dB SPL Attenuation Front-to-Rear
  • 2 x 12" Woofers
  • Frequency Response: 44 to 104 Hz
  • 3600 Watt Class-D Power Module
  • 2 x Combo XLR-1/4" Inputs, XLR Pass-Thru
  • Vertical or Horizontal Deployment
  • Baltic Birch Enclosure
  • Limited 6-Year Warranty

The KS212C from QSC, is 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 attenuation front-to-rear. The unit offers a frequency response of 44 to 104 Hz (-6 dB) with a peak SPL of 132 dB (@ 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 attenuation front-to-rear
  • 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

Configuration Dual 6th order bandpass cardioid subwoofer
Transducer LF Transducer: 2 x 12.0" / 304.8 mm, cone
Frequency Response Frequency Response (-6 dB): 44 - 104 Hz
Frequency Range Frequency Range (-10 dB): 39 - 118 Hz
Nominal Coverage Angle 180˚ cardioid (15 dB rear rejection @ 70 Hz)
Maximum SPL 132 dB @ 1 m, peak
Amplifier Class-D: 2 x 1800 W (peak)
Cooling Low-noise, variable speed fan
Controls Power
Rotary encoder
2 x selection buttons
Indicators 2 x power LEDs (front and rear)
Input signal LED
Limiter active LED
Connectors 2 x locking combo XLR-1/4” / 6.35 mm
2 x XLR-M (Loop-thru Output)
1 x locking IEC power connector
Power AC Power Input: Universal power supply 100 - 240 VAC, 50/60 Hz AC Power Consumption: 1/8th power
Enclosure 0.7" / 18.0 mm birch plywood
Color Black
Grille Internal woofer cover
Compliance Regulatory CE, WEEE, UL, China RoHS, RoHS II, FCC Class-B
Dimensions (H x W x D) 24.0 x 15.0 x 33.5" / 609.6 x 381.0 x 850.9 mm
Weight 88.4 lb / 40.1 kg
Packaging Info
Package Weight 88.4 lb
Box Dimensions (LxWxH) 38.0 x 27.0 x 20.0"