The QSC CS18-NA is a high-performance 18-inch active subwoofer designed to deliver deep, powerful low-frequency reinforcement for professional audio applications. As the largest model in the CS Series, it combines high-output bass performance with advanced DSP and wireless connectivity for live sound, mobile entertainment, houses of worship, event production, and installed sound systems.

Its Class D amplifier delivers powerful low-frequency output, while Bluetooth audio streaming with True Wireless Stereo (TWS) provides convenient wireless playback. The QSC Loudspeaker Control App supports wireless system control, and integrated DSP features DEEP™ enhancement and Cardioid deployment modes for flexible bass management.

Built for demanding professional environments, the CS18 features a durable birch plywood enclosure, a black powder-coated steel grille, and convection cooling. Two locking XLR/TRS combo inputs, loop-thru and post-DSP outputs, and an M20 threaded pole mount provide practical connectivity and deployment options.

Key Features

• 18-inch direct-radiating active subwoofer
• High-output Class D amplification
• Bluetooth audio streaming with TWS
• Wireless control through the QSC Loudspeaker Control App
• DEEP™ low-frequency enhancement
• Cardioid deployment mode for directional bass control
• Integrated DSP with selectable presets.

Ideal For

• Live sound reinforcement
• Mobile DJs and entertainers
• Event production and touring
• Houses of worship
• Professional installed audio systems

What’s in the Box

• QSC CS18-NA Active Subwoofer

Frequently Asked Questions

Q: What size driver does the CS18-NA use?

It features an 18-inch (460 mm) direct-radiating cone driver.

Q: Does the CS18-NA support Bluetooth?

Yes. It supports Bluetooth audio streaming with True Wireless Stereo (TWS).

Q: Can it be controlled wirelessly?

Yes. It supports wireless control through the QSC Loudspeaker Control App.

Q: Does it support Cardioid deployment?

Yes. It offers Cardioid radiation mode for improved low-frequency directionality.

Full Technical Specifications

General

Configuration	Direct Radiating
LF Transducer	18" (460 mm) Cone
Amplifier	Class D
Amplifier Power	3600W Peak (Overview); 2600W Peak (Detailed Specs – Verify)
Maximum SPL	135 dB (Overview); 134 dB (Detailed Specs – Verify)
Frequency Response (-6 dB)	46 Hz–96 Hz
Frequency Response with DEEP™	39 Hz–96 Hz
Frequency Range (-10 dB)	40 Hz–103 Hz
Frequency Range with DEEP™	35 Hz–103 Hz
Coverage Modes	Omnidirectional or Cardioid Radiation
Bluetooth	Bluetooth Audio with True Wireless Stereo (TWS)
Wireless Control	QSC Loudspeaker Control App
DSP	Integrated DSP with User-Selectable Presets
Cooling	Convection Cooled
Controls	Power On/Off, Gain Control, 2 × Selection Buttons
Indicators	Power LED, Limiter Active LED, Input System LED, 2 × Signal LEDs

Connectivity

Analog Inputs	2 × Locking XLR/F-1/4" Combo Inputs
Analog Outputs	2 × XLR Outputs
Output Configuration	1 × Loop-Thru, 1 × Post-DSP
Power Connector	1 × IEC Power Connector
AC Power Input	100–240 VAC, 50–60 Hz
AC Power Consumption	100 VAC: 2.7A; 120 VAC: 2.2A; 240 VAC: 1.1A
Power Supply	Universal

Construction

Enclosure	12–15 mm Birch Plywood
Grille	16-Gauge Black Powder-Coated Steel
Pole Mount	M20 Threaded Mount

Physical Specifications

Product Weight	82.9 lbs
Product Dimensions	25.2" H × 20.2" W × 25.9" D
Shipping Weight	98.3 lbs
Shipping Dimensions	28" H × 30" W × 28.5" D