JBL Control 321CT 12" Coaxial 2-WAY Ceiling Spk W Transformer B-Stock
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- SKU
- CONTROL-321CT-B
Description
JBL Control 321CT 12" Coaxial 2-Way Ceiling Speaker with Transformer
The Control 321CT is a professional-grade coaxial ceiling speaker engineered to deliver consistent coverage and clarity in recording studios, production facilities, and monitoring environments. Its compact 14.4" footprint mounts flush into standard ceiling cavities, providing controlled dispersion across the studio space without acoustic coloration or interference. Built for permanent installation where precise sound reinforcement and spatial distribution matter, this speaker combines robust construction with straightforward 70V/100V amplifier compatibility—ideal for multi-room studio setups, post-production facilities, and reference monitoring applications.
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 that translates accurately across mixes. Frequency response extends from 47 Hz to 16 kHz (±3 dB), with maximum SPL reaching 118 dB at 1 meter—sufficient for honest playback of dialogue, music, and effects during sessions and monitoring. The 90° conical constant-directivity pattern ensures uniform tonal balance throughout the studio or facility, eliminating hot spots and dead zones that compromise critical listening and mixing decisions.
Installation & Integration
The integrated 70V/100V step-down transformer offers four selectable taps (68W, 34W, 17W, 8.5W), allowing seamless level matching into your console or amplifier without external components—wire directly to the amplifier line and set the tap for your system load. With 250W continuous power capacity and 1000W peak handling, the speaker accommodates both modest background reinforcement and full-output monitoring sessions. The metal baffle and ported enclosure design provide extended low-end response while the pre-mounted driver assembly simplifies ceiling installation into the standard 378 x 378 mm (14.9 x 14.9 in) opening, reducing downtime in active production environments.
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 required in professional recording and production environments, backed by JBL's proven engineering for studio-grade audio systems.
More Information
| Condition | Refurbished |
|---|
Reviews
At a Glance
The JBL Control 321CT is a commercial-grade coaxial ceiling speaker optimized for background music, speech reinforcement, and modest music playback in studio monitoring applications where full-range, balanced tone is needed. Its dual-driver design pairs a 12-inch Kevlar woofer with a titanium compression driver, tuned through a 1.8 kHz crossover for seamless midrange integration and extended frequency response (47 Hz–16 kHz). Built for permanent ceiling installation with integrated transformer and selectable power taps, it simplifies wiring and works as a reference monitor or multi-purpose playback tool in acoustic spaces.
Who This Is For
Great for
- ✓ Commercial installations
- ✓ Speech intelligibility
- ✓ Background music
- ✓ Retail and hospitality
Not the best pick for
- – Live concert sound
- – DJ performance
- – High-fidelity music listening
Skill level: Beginner · Intermediate · Advanced · Professional
Frequently Asked Questions
What does B-Stock mean for this speaker?
B-Stock means the speaker is fully functional and meets all performance specifications, but may have minor cosmetic imperfections from display or handling. All audio performance, power handling, and coverage characteristics are identical to new units.
What amplifier power tap should I use?
The integrated transformer offers four selectable taps (68W, 34W, 17W, 8.5W) to match your amplifier output. Select the tap closest to your amplifier's rated power at 70V or 100V line level—no external step-down transformer required.
Is this speaker suitable for live music or DJ events?
No. The Control 321CT is designed for commercial installations, background music, and speech intelligibility in permanent ceiling applications. It is not intended for live concert sound, DJ performance, or high-fidelity music listening environments.
How much ceiling space does this speaker need?
The speaker mounts into a standard 378 x 378 mm (14.9 x 14.9 inch) ceiling cavity opening. The compact form factor is 14.4 inches H x 14.4 inches W x 9.5 inches D, designed for flush mount installation in drywall or drop ceilings.
What frequency range does it cover?
The speaker delivers ±3 dB response from 47 Hz to 16 kHz, with an extended range (-10 dB) of 34 Hz to 18 kHz. Maximum SPL reaches 118 dB at 1 meter, sufficient for speech clarity and music reinforcement across medium to large spaces.
Do I pay sales tax on this order?
We collect sales tax only on orders shipped to California. Orders shipped to any other US state are charged $0 sales tax at checkout when you buy direct from our website. Marketplaces such as eBay, Reverb and Amazon collect sales tax in nearly every state as marketplace facilitators no matter who the seller is, so the same item at the same price costs less bought direct. Free US shipping and 30-day returns are included. Some states ask buyers to self-report use tax on out-of-state purchases.
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