Product Overview

The JBL Control 321CT is a passive 12-inch coaxial ceiling loudspeaker built for voice amplification and foreground-music reproduction in commercial AV installations. It suits offices, waiting rooms, retail stores, restaurants, and meeting spaces that need clear speech and program audio from a ceiling-grid layout. With a Kevlar-reinforced 12-inch cone and a compression driver, this coaxial ceiling speaker provides 250 W long-term power handling (1000 W peak) and consistent 90-degree broadband coverage. It carries a built-in multi-tap transformer for direct 70V/100V distributed-line operation.

Product Description

The Control 321CT pairs a 300 mm (12 in) Kevlar-reinforced cone woofer with a 50 mm (2 in) voice coil and a 25 mm (1 in) compression driver, yielding an extended frequency response of 47 Hz – 16 kHz. The cone also serves as a high-frequency waveguide, producing reliable 90-degree broadband coverage, while an advanced high-slope crossover network ensures proper frequency distribution and a smooth, natural midrange. A removable locking connector with screw-down terminals ensures easy wiring at the desired power-tap setting. A low-saturation transformer provides compatibility with 70V/100V power amplifiers (sold separately). Explore related models in the JBL Professional installed audio collection. The companion JBL Control 321C (8-ohm version) serves the alternate wiring scheme.

Key Features

• 12-inch coaxial design A 300 mm Kevlar-reinforced cone and compression driver share an axis for time-aligned, full-range output.
• 90-degree broadband coverage The cone-as-waveguide geometry maintains consistent pattern control across the listening area.
• 250 W power handling High power handling (1000 W peak) with high sensitivity provides strong SPL capability.
• Extended frequency response Clear speech and vocals with extended response for foreground music (47 Hz – 16 kHz).
• High-slope crossover network Maintains constant coverage and a smooth, natural midrange transition.
• Built-in 70V/100V transformer A low-saturation multi-tap transformer allows direct distributed-line operation set at the connector.
• Locking connector wiring A removable locking connector with screw-down terminals simplifies input and loop-thru wiring.

Typical Applications

• Conference room Clear speech and program audio in standard ceiling-grid layouts.
• Commercial meeting space Even foreground coverage for lobbies and gathering areas.
• Multi-purpose room Flexible voice and music reproduction across wide rooms.
• Training room Intelligible voice reinforcement for seated audiences.
• Government space Reliable paging and announcement coverage.

Technical Specifications

Full electrical specifications should be confirmed against the JBL Control 321CT specification sheet.

Frequently Asked Questions

Does the Control 321CT connect directly to a 70V/100V system?
Yes. It includes a low-saturation multi-tap transformer for direct 70V or 100V distributed-line operation, set at the connector.

What coverage pattern does it provide?
The coaxial cone-as-waveguide design delivers consistent 90-degree broadband coverage for even intelligibility across the listening area.

How is it wired?
A removable locking connector with screw-down terminals supports input and loop-thru output for fast, secure installation.

What warranty and support apply?
The Control 321CT carries JBL Professional’s manufacturer warranty. For tap planning and integration support, contact our team or browse the full JBL Professional collection.