JBL Control 321CT 12" Coaxial 2-WAY Ceiling Spk W Transformer

JBL Control 321CT 12" Coaxial 2-Way Ceiling Speaker with Transformer

The Control 321CT is a professional-grade coaxial ceiling speaker built for venues, installed studios, and permanent sound systems where consistent coverage and speech intelligibility are non-negotiable. Its compact 14.4" footprint mounts flush into standard ceiling cavities, delivering controlled dispersion across large spaces without drawing attention. Purpose-built for permanent installation in performance venues, broadcast facilities, worship spaces, and institutional environments, this speaker combines robust construction with straightforward 70V/100V amplifier compatibility—no external transformers needed.

Audio Performance & Coverage

The dual-driver coaxial design pairs a 12" Kevlar-reinforced woofer with a titanium-diaphragm compression driver, tuned through a 1.8 kHz 3rd order crossover for seamless midrange integration. Frequency response extends from 47 Hz to 16 kHz (±3 dB), with maximum SPL reaching 118 dB at 1 meter—sufficient for live speech reinforcement and music coverage across medium to large rooms without distortion or feedback issues. The 90° conical constant-directivity pattern ensures uniform tonal balance throughout the coverage area, eliminating hot spots and dead zones that compromise intelligibility during live events.

Installation & Power Handling

The integrated 70V/100V step-down transformer offers four selectable taps (68W, 34W, 17W, 8.5W), allowing level matching without external components—simply wire to the amplifier line and set the tap for your load. With 250W continuous power capacity and 1000W peak handling, the speaker accommodates both modest background systems and higher-output live installations. The metal baffle and ported enclosure design provide extended low-end response while the pre-mounted driver assembly simplifies ceiling cutout installation into the standard 378 x 378 mm (14.9 x 14.9 in) opening.

Key Features

• 12" Kevlar-reinforced low-frequency driver
• Titanium-diaphragm compression driver for high frequencies
• Frequency response ±3 dB: 47 Hz – 16 kHz
• Extended range (-10 dB): 34 Hz – 18 kHz
• Maximum SPL: 118 dB at 1 meter
• Power capacity: 250W long-term / 1000W peak
• 1.8 kHz 3rd order crossover with conjugate networks
• 90° conical constant-directivity coverage pattern
• Integrated 70V/100V transformer with four selectable taps (68W, 34W, 17W, 8.5W)
• Compact ceiling-mount form factor: 14.4" H x 14.4" W x 9.5" D
• Metal baffle with ported enclosure design
• Sensitivity: 94 dB (1 kHz - 16 kHz)

The Control 321CT delivers the reliability and acoustic precision expected in professional sound installations, backed by JBL's proven engineering for live and permanent audio systems.