JBL Professional Control 321CT

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12 in. Coaxial Ceiling Loudspeaker with HF Compression Driver

The Control 321CT has been engineered from the ground up to deliver exceptional next-generation performance in a coaxial point source design ceiling loudspeaker.

Features

Consistent 90° broadband pattern control.
Components
• 300 mm (12 in) woofer with Kevlar-reinforcedcone with 50 mm (2 in) voice-coil.
• 25 mm (1 exit) compression driver.
Extraordinary clarity for speech and vocals with extended frequency response for music.
250 Watt power handling with high sensitivity provides high SPL capability.
Advanced high-slope crossover network for constant coverage and smooth, natural midrange.
Clean, contemporary grille and optional backbox available.

Downloads

	Version	Language	Size	Uploaded
Specifications
Control 321C/CT12 Spec Sheet updated: 4월 2019			1.47MB	4월 2019
Manuals
Ceiling Speaker Accessory Guide updated: 10월 2019			127KB	10월 2019
Control 300 Series Transformer Insertion Loss Chart updated: 10월 2019			15.4KB	10월 2019
Transformer Bypass on Control 321CT, Control 322CT, or Control 328CT updated: 10월 2019			59.2KB	10월 2019
Brochures
Control 300 Brochure updated: 4월 2019			2.9MB	4월 2019
CAD Drawings
Control 300 Ceiling Speakers updated: 10월 2019			1.39MB	10월 2019
Compliances
Control 300 Series Declaration of Conformity updated: 10월 2019			92.7KB	10월 2019
JBL Control Series Passive Speakers DoC updated: 12월 2019			179KB	12월 2019
Software
Distributed System Design (DSD) version 3.7, updated: 11월 2023	3.7		1.07MB	11월 2023
Install Guides
Control 321 & 322 Installation Guide updated: 4월 2019			574KB	4월 2019

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Parts & Service

Specifications

Frequency Range (-10dB)	34 Hz – 18 kHz
Power Rating	IEC Long-Term System Power Rating: 250 W continuous pink noise (1000 W peak), 2 hrs 200 W continuous pink noise (800 W peak), 100 hrs
Transformer Taps	68W, 34W, 17W, (& 8.5W @ 70V)
Frequency Response (±3 dB)	47 Hz – 16 kHz
Coverage Angle	90° conical, constant directivity
Directivity Factor (Q)	8.7 (1k - 16kHz)
Directivity Index (DI)	9.4 dB (1k - 16kHz)
Sensitivity	94 dB (1 kHz - 16 kHz)
Crossover Network	1.8 kHz, 3rd order (18 dB/oct) high-pass plus conjugate to HF, 2nd order low-pass to LF
Dimensions (H x W x D)	366 x 366 mm (14.4 x 14.4 in) square baffle x depth from back of baffle of 240 mm (9.5 in)
Maximum SPL (1m)	118 dB (top 70V/100V tap)
Input Connectors	Screw locking barrier strip for bare wire
Drivers	LF Driver: 300 mm (12 in) HF Driver: compression driver, 25 mm (1 inch) coil
Color	White
Safety Agency	Suitable for use in air handling spaces per UL1480, UL2043, NFPA90 & NFPA 70 when installed with UL listed backcan such as JBL MTC-300BB12. S7232/UL Listed, Signaling Speaker. Transformer UL registered per UL1876. In accordance with IEC60849/EN60849.
Backcan	formed steel (wood-lined; accessory)
Baffle/Rim	Metal, driver pre-mounted to baffle, ported.
Ceiling Cutout Size	378 x 378 mm (14.9 x 14.9 in) (for MTC-300BB12 backcan)
Included Accessories	Ported baffle pre-attached, transformer on 321CT.
Optional Accessories	MTC-300SG12 Grille, square contoured, white. MTC-300BB12 Backbox, 80 liters (3 cubic feet) MTC-300T150 Transformer, 150 W for use with 321C.
Plenum Usage	Yes, with accessory backcan

accessories

MTC-300BB12 | 3 Cubic Ft. Backbox for Control 300 Series 12 in. Drivers

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3 Cubic Ft. Backbox for Control 300 Series 12 in. Drivers

Professional Series

Extra-thick 16 gauge metal construction.
Lined with 12 mm (½ inch) thick MDF to eliminate resonances and to provide extra bass response.
Knockouts on top and all four sides.
Dual mounting system for baffle.
Mounting platform for an optional high-power 70V/100V transformer.

Documentation

MTC-300BB12 Spec Sheet [2.54MB]
Accessing the Conduit Knockouts [116KB]
Control 300 Ceiling Speaker Backboxes / Backcans [1.1MB]
Control 300 Ceiling Speakers [1.39MB]
JBL Brackets [152KB]
Brackets Declaration of Conformity [141KB]

MTC-300SG12 | Square Grille for Control 300 Series 12 in. Drivers

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Square Grille for Control 300 Series 12 in. Drivers

Professional Series

Rugged 19 gauge metal construction for enduring reliability.
Sculpted design for an elegant appearance and perfect for any decor or architectural setting.
Zinc underplating provides a rust and scratch resistant surface for years of maintenance free wear.
Powder coat final finish minimizes scratching and can easily be repainted to match any room color.