QSC KS212C – 3600W Dual 12-Inch Powered Cardioid Subwoofer

Product Overview

The QSC KS212C is a 3600W powered dual-12-inch subwoofer with a built-in cardioid mode, delivering directional low-frequency reinforcement from a single unit without the complexity of multi-subwoofer cardioid arrays. It suits large portable PA systems, touring, live events, houses of worship, and commercial installations that need high-power, directionally controlled bass.

In cardioid mode, the KS212C significantly reduces bass energy behind the cabinet, giving performers on stage and neighboring spaces greater low-frequency control.

Product Description

The KS212C pairs dual 12-inch drivers with a 3600W Class-D amplifier in a single portable chassis, providing high output for demanding live and install applications. Its defining feature is single-unit cardioid operation: an internal configuration cancels rearward low-frequency energy without requiring additional subwoofers or complex setup.

Integrated DSP includes a crossover with adjustable frequency, polarity, and delay for precise alignment with full-range loudspeakers. The result is tighter on-stage sound, reduced bass spill toward back-of-house, and cleaner low-frequency control in challenging rooms.

The KS212C pairs with QSC K.2 Series and other full-range loudspeakers. For a single-driver 18-inch sub, see the QSC KS118; for a compact option, the QSC KS112.

Key Features

• 3600W Class-D amplification — High output from dual 12-inch drivers in a single portable chassis.
• Built-in cardioid mode — Single-unit cardioid operation without additional subwoofers or complex configuration.
• Directional bass control — Significantly reduces low-frequency energy behind the cabinet for cleaner stages and neighboring spaces.
• Integrated DSP crossover — Adjustable crossover frequency, polarity, and delay for system alignment.
• Full-range pairing — Designed to integrate with QSC K.2 Series and other full-range loudspeakers.

Typical Applications

• House of worship
• Auditorium
• Multi-purpose room
• Commercial meeting space

Technical Specifications

Competitor Comparison

Frequently Asked Questions

How does single-unit cardioid mode work?
The KS212C uses its dual drivers and onboard DSP to cancel rearward low-frequency energy, so one cabinet provides directional bass without the multiple subwoofers a traditional cardioid array requires.

What does cardioid mode improve?
It reduces bass spill toward the stage and back-of-house, giving performers cleaner monitoring and improving low-frequency control in neighboring spaces.

Which loudspeakers does it pair with?
It is designed to extend QSC K.2 Series and other full-range loudspeakers, with DSP crossover and delay for alignment.

What warranty and support come with this subwoofer?
QSC powered loudspeakers are covered under QSC's standard limited warranty; refer to QSC's published warranty terms for the current coverage period applicable to this model. Creation Networks provides pre- and post-sale support for system design and integration questions.