QSC Pro audio KS212C

The Essentials to Know About the QSC KS212C Active Subwoofer

• Controlled Directivity: Integrated cardioid architecture to focus energy towards the audience and limit bass feedback on stage.


• Power and Endurance: Class D amplification with 1800 W RMS (3600 W peak) and high SPL level for demanding live configurations.


• Control and Protection: Built-in DSP with advanced functions for reliable and consistent reproduction, night after night.


• Easy Integration: 2 combo XLR/6.35mm Jack inputs, 2 XLR "loop thru" outputs, and 35 mm pole mount socket.

A KS Series Subwoofer Designed for Modernity

Designed as the new generation of QSC subwoofers, the KS series emphasizes precise low-frequency reproduction tailored to current applications. The KS212C follows this line with innovative design, efficient amplification, and reliability recognized by professionals.

For Whom and For Which Venues?

Service providers, DJs, multipurpose rooms, clubs, and places of worship will appreciate its cardioid directivity that reduces rear noise, facilitates coexistence with the stage, and improves clarity in reverberant environments. Its simple connectivity and portability make it an ideal ally for mobile setups and fixed installations.

Technologies and Design Serving Performance

Directional Bass, Cleaner Mix

The cardioid radiation limits bass leakage behind the subwoofer, helping to keep the stage quieter and focusing impact in the listening area. The result: cleaner, better-contained, and more usable bass at high levels.

Class D Amplification and Advanced DSP

The high-power amplification module efficiently drives the transducer, while the integrated DSP manages optimization, alignment, and essential protections for stable performance over time.

Robust Construction and Road-Ready

The 18 mm birch plywood enclosure ensures rigidity and durability. The 35 mm pole mount facilitates column setup with your full-range speakers, and professional connectors simplify cabling on tour or in installation.

Technical specifications

Battery	No	EQ	Yes
Frequency response - start	39 Hz	Baseplate width	35 mm
Frequency response - end	100 Hz	Cutaway	No
Category	Soundsystem	SPL max	132 dB
Type	active subwoofer	Speaker structure	wood
Peak power	3600 W	Transport	2 handles
Number of channels	1 channel	Inputs	2 x XLR, 2 x combo XLR/jack
Amplification	Active amplified	Outputs	2 x XLR
Application	Facade	Color	Black
Bluetooth	No	Finishing	Black & chrome
Connection	Combo, XLR Link, XLR	Power output	1800 W
Speaker diameter	12"	Weight	40.1 kg
Number of speakers	2	Dimensions (mm)	394 x 851 x 622

Design	active direct-radiating subwoofer	Power (peak)	3600 W (Class D)
Loading	bandpass (BP)	Enclosure	18 mm birch plywood
Woofer	18" cone	Mounting socket	35 mm
Max SPL (peak @ 1 m)	136 dB	Net weight	47.00 kg
Frequency response (-6 dB)	41 Hz - 98 Hz	Accessories (not included)	cover, linking tube, and protective cap
Frequency response (-10 dB)	35 Hz - 111 Hz	AC Consumption	240 V, 1.7 A
Nominal coverage	omni or cardioid	Warranty	3 years + 3 years (product registration within 30 days of purchase)
Power (RMS)	1800 W (Class D)