JBL Control 424C/T 4" Two-Way Coaxial Ceiling Loudspeaker

The JBL Control 424C/T is a professional 4-inch two-way coaxial ceiling loudspeaker designed for high-quality background music, foreground audio, and paging applications in commercial environments. Part of JBL Professional's Control 400 Enhanced Coverage Series, this compact ceiling speaker combines advanced driver technology, wide sound coverage, and installer-friendly features for modern commercial audio systems.

Featuring JBL's innovative Coplanar RBI (CRBI) technology, the Control 424C/T delivers consistent sound quality across a wide 130-degree conical coverage pattern. Its 4-inch low-frequency driver and 0.75-inch soft-dome tweeter provide clear speech reproduction and balanced music performance in restaurants, retail stores, offices, hotels, classrooms, and other commercial spaces.

The speaker includes a built-in 30-watt transformer for 70V/100V distributed audio systems, along with a 16-ohm direct input for compatible low-impedance amplifiers. An integrated steel backcan, magnetic grille, and secure mounting system make the Control 424C/T an excellent solution for new installations and commercial sound system upgrades.

JBL Coplanar RBI Technology for Consistent Sound Coverage

The Control 424C/T incorporates JBL's Coplanar Radiation Boundary Integrator (CRBI) technology, designed to improve the integration of low- and high-frequency sound.

This specialized driver arrangement combines a 4-inch woofer with a horn-loaded 0.75-inch soft-dome tweeter to produce smooth, consistent audio throughout the listening area.

With its wide 130-degree conical coverage pattern, the Control 424C/T helps provide even sound distribution across commercial spaces, reducing the need for closely spaced loudspeakers in suitable installations.

Its frequency range of 75 Hz to 18 kHz makes it well suited for speech, background music, and foreground audio applications.

Flexible 70V/100V and 16-Ohm Operation

The JBL Control 424C/T features a built-in 30-watt multi-tap transformer, allowing it to operate in commercial distributed audio systems.

70V Transformer Taps:

• 30 watts
• 15 watts
• 7.5 watts
• 3.7 watts

100V Transformer Taps:

• 30 watts
• 15 watts
• 7.5 watts

The speaker also supports 16-ohm direct operation when connected to a compatible low-impedance amplifier.

This flexibility allows installers to configure the Control 424C/T for a variety of sound system designs, from multi-speaker commercial paging systems to smaller installations requiring detailed music reproduction.

Modern Magnetic Grille and Architectural Design

The Control 424C/T features a full-face, bezel-less magnetic grille that provides a clean appearance in modern commercial interiors.

The included white round grille is paintable, allowing the speaker to blend into surrounding ceiling finishes.

A pre-attached safety tether helps secure the grille during installation and maintenance.

Optional black round and white square grilles are available separately for applications requiring a different appearance.

Installer-Friendly Ceiling Mounting

The JBL Control 424C/T is engineered to simplify installation in suspended ceilings and compatible ceiling structures.

Its powder-coated steel backcan provides a durable, enclosed design, while the captive dogear mounting system helps secure the speaker across a range of ceiling thicknesses.

A redesigned terminal cover supports both top and side cable entry, making wiring easier in tight ceiling spaces.

The speaker uses removable locking Euroblock connectors for secure audio connections and convenient system installation.

With a ceiling cutout diameter of approximately 6.6 inches, the Control 424C/T offers a compact installation footprint.

When replacing an existing JBL Control 24C/T or another ceiling speaker, installers should verify the existing cutout dimensions and available mounting depth before installation.

JBL Control 424C/T Key Features

• 4-Inch Two-Way Coaxial Design: Clear speech and balanced music reproduction
• JBL Coplanar RBI Technology: Smooth integration of low- and high-frequency drivers
• 0.75-Inch Soft-Dome Tweeter: Detailed high-frequency performance
• 130° Conical Coverage: Wide and consistent sound distribution
• 75 Hz–18 kHz Frequency Range: Suitable for music and paging applications
• Built-In 30W Transformer: Supports 70V and 100V distributed audio systems
• 16-Ohm Direct Input: Compatible with properly matched low-impedance amplifiers
• 60W Continuous Power Capacity: Based on two-hour pink-noise testing
• Integrated Steel Backcan: Durable enclosure for commercial installations
• Full-Face Magnetic Grille: Clean, modern architectural appearance
• Paintable White Grille: Blends with ceiling finishes
• Grille Safety Tether: Helps secure the removable grille
• Top and Side Cable Entry: Flexible installation and wiring options
• Captive Dogear Mounting System: Secure installation in compatible ceilings
• UL 2043 Air-Handling Space Suitability: Appropriate for specified plenum installations
• IP33 Environmental Rating: Provides specified ingress protection

JBL Control 424C/T Technical Specifications

Specification	Details
Manufacturer	JBL Professional
Model	Control 424C/T
Manufacturer Part Number	JBL-C424C/T
Product Series	Control 400 Enhanced Coverage
Speaker Type	Two-Way Coaxial Ceiling Loudspeaker
Low-Frequency Driver	4" (100 mm) treated paper cone
High-Frequency Driver	0.75" (19 mm) textile soft-dome
Driver Technology	Coplanar RBI (CRBI)
Frequency Range (-10 dB)	75 Hz–18 kHz
Frequency Response (±3 dB)	88 Hz–17 kHz
Power Capacity (100 Hours)	40W continuous / 160W peak
Power Capacity (2 Hours)	60W continuous / 240W peak
Continuous Program Power (2 Hours)	120W
Sensitivity (1W/1m)	85 dB
Coverage Pattern	130° conical
Maximum SPL at 1 Meter	103 dB continuous / 109 dB peak
Nominal Impedance	16 ohms
Built-In Transformer	30W multi-tap
70V Transformer Taps	30W, 15W, 7.5W, 3.7W
100V Transformer Taps	30W, 15W, 7.5W
Low-Impedance Operation	16-ohm direct
Recommended High-Pass Filter	70 Hz, 24 dB/octave Linkwitz-Riley
Input Connection	Removable locking Euroblock
Enclosure Material	Powder-coated steel backcan
Baffle Material	Polypropylene
Grille	White, round, magnetic, paintable
Ceiling Cutout Diameter	6.6" (168 mm)
Overall Diameter	7.7" (196 mm)
Overall Height	7.2" (182 mm)
Depth Above Ceiling Reference	6.8" (173 mm)
Net Weight	6.2 lbs (2.8 kg) each
Environmental Rating	IP33
Operating Temperature	32°F–113°F (0°C–45°C)
Safety Certifications	UL 1480A, UL 2043, CSA C22.2 No. 205
Mounting System	Captive dogear clamps
Finish	White grille

Recommended Applications

Restaurants and Cafés: Deliver consistent background music and clear announcements throughout dining areas.

Retail Stores: Provide balanced music reproduction and paging coverage across sales floors and customer areas.

Corporate Offices: Support background music, paging, and presentation audio in offices and common spaces.

Hotels and Hospitality: Provide comfortable music coverage in lobbies, corridors, lounges, and meeting rooms.

Schools and Universities: Deliver intelligible speech and program audio in classrooms and educational facilities.

Houses of Worship: Provide music and spoken-word coverage in classrooms, fellowship halls, and auxiliary spaces.

Commercial Buildings: Integrate with 70V/100V distributed audio systems for paging and general-purpose audio.

Compatible JBL Control 424C/T Accessories

The following optional JBL accessories are designed for the Control 424C/T:

• JBL MTC-424BG: Black round magnetic grille
• JBL MTC-424SG: White square magnetic grille
• JBL MTC-424NC: New construction bracket
• JBL MTC-424MR: Mud-ring construction bracket
• JBL MTC-48TRX4: Tile rail accessory for 4' × 4' ceiling tiles

Accessories are sold separately.

Why Buy the JBL Control 424C/T from Audio Supply?

Audio Supply offers professional JBL ceiling loudspeakers and commercial sound equipment for contractors, integrators, and businesses. We can help you select compatible amplifiers, mounting accessories, and additional speakers for your installation.