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 engineered for studio monitoring and production spaces where consistent coverage and clarity matter. Its compact 14.4" footprint mounts flush into standard ceiling cavities, delivering controlled dispersion across the room without acoustic coloration. Built for permanent installation in control rooms, mastering suites, post-production facilities, and collaborative studio environments, this speaker combines robust construction with straightforward 70V/100V amplifier compatibility for flexible gain staging and integration into existing studio infrastructure.

Sonic Character & Monitoring Capability

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 that translates well across multiple playback systems. Frequency response extends from 47 Hz to 16 kHz (±3 dB), with maximum SPL reaching 118 dB at 1 meter—sufficient for critical listening and mix evaluation across medium to large control rooms. The 90° conical constant-directivity pattern ensures uniform tonal balance throughout the listening area, eliminating room nulls and acoustic anomalies that compromise mixing decisions.

Integration & Signal Flow

The integrated 70V/100V step-down transformer offers four selectable taps (68W, 34W, 17W, 8.5W), allowing precise level matching without external components—simply wire to the monitor amplifier and set the tap for your desired output. With 250W continuous power capacity and 1000W peak handling, the speaker accommodates both nearfield reference applications and larger studio monitoring setups. The metal baffle and ported enclosure design provide extended low-end response for mix translation while the pre-mounted driver assembly simplifies installation into the standard 378 x 378 mm (14.9 x 14.9 in) ceiling 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 studio installations, backed by JBL's proven engineering for critical monitoring applications.