Control 424C/T

4" CRBI™-Equipped Two-Way Coaxial Ceiling Loudspeaker

Control 424C/T
Larger Images

The JBL Control 424C/T is a two-way coaxial ceiling loudspeaker, featuring a 4” woofer and integrated enclosure that is ideal for installation in most ceiling plenum spaces. Integrated CRBI™ technology provides 130° of consistent, full, rich sound to the listening area. A full-face magnetic grille blends seamlessly with modern decors and optional black and square grilles are available. Mechanical improvements include redesigned terminal covers with top and side cable entry ports and an extremely reliable new dogear design that works with a wide range of ceiling thicknesses. The JBL Control 424C/T includes a transformer to support both 70V/100V and low impedance applications.

  • Superior Sonic Performance

    The Coplanar RBI™, or CRBI™ delivers an especially smooth sound character that remains consistent, clear, and pleasant across a wide coverage area. It reduces on-axis hot spots and off-axis cold spots and improves the listening experience for users as they move throughout a space. This enhanced coverage results in fewer speakers, amplifier channels, and project costs, required to cover a space.

  • Efficient, Flexible Installation

    Various Control 400 Enhanced Coverage Series mounting enhancements improve installation repeatability and safety while reducing installation time. Redesigned terminal covers provide both top and side cable entry ports and can be secured without tools thanks to captive hand-screws. The captive dogear design is extremely reliable and works with a wide range of ceiling thicknesses.

  • Refined, Modern Aesthetics

    Full-face magnetic grilles provide a sleek, refined look to meet the sensibilities of modern architectural design. They are equipped with safety tethers, which mount right into the baffle to ensure peace of mind. Optional black and square accessory grilles are also available to empower added design versatility.

featured content

Superior Sonic Performance

The Coplanar RBI™, or CRBI™ delivers an especially smooth sound character that remains consistent, clear, and pleasant across a wide coverage area. It reduces on-axis hot spots and off-axis cold spots and improves the listening experience for users as they move throughout a space. This enhanced coverage results in fewer speakers, amplifier channels, and project costs, required to cover a space.

featured content

Efficient, Flexible Installation

Various Control 400 Enhanced Coverage Series mounting enhancements improve installation repeatability and safety while reducing installation time. Redesigned terminal covers provide both top and side cable entry ports and can be secured without tools thanks to captive hand-screws. The captive dogear design is extremely reliable and works with a wide range of ceiling thicknesses.

featured content

Refined, Modern Aesthetics

Full-face magnetic grilles provide a sleek, refined look to meet the sensibilities of modern architectural design. They are equipped with safety tethers, which mount right into the baffle to ensure peace of mind. Optional black and square accessory grilles are also available to empower added design versatility.

Features

  • Coaxially mounted 100 mm (4 in) woofer and 19 mm (0.75 in) soft-dome tweeter
  • Integrated enclosure that is ideal for installation in most ceiling plenum spaces
  • CRBI™ technology for consistent 130° coverage across the listening area
  • Built-in 70V/100V multi-tap transformer, plus 16-ohm direct input
  • Full-face, easily paintable magnetic grilles
  • Top and side exit cable entry options
  • Robust and adaptable dogears for wide range of ceiling thicknesses
  • IP33 rated

Downloads

Specifications
  Size Uploaded
file type icon Control 424C/T – Spec Sheet
updated: Jan 2025
650 KB Jan 2025
Manuals
  Size Uploaded
9.99 MB Jan 2025
Brochures
  Version Language Size Uploaded
  en  21 MB Mar 2026
    3.9 MB Aug 2025
file type icon Control Contractor Brochure (2025)
en version A, updated: Mar 2026
en  23 MB Mar 2026
CAD Drawings
  Size Uploaded
10.5 MB Mar 2026
Bim Objects
  Size Uploaded
file type icon Control 424C/T - BIM Object
updated: Mar 2025
Mar 2025
Software
  Version Size Uploaded
Windows download icon Distributed System Design (DSD)
version 3.9, updated: Nov 2025
3.9   612 KB Nov 2025
Declaration Of Conformity
  Size Uploaded
143 KB Feb 2025
210 KB Feb 2025
Ease Data
  Size Uploaded
file type icon Control 424C/T – EASE GLL
updated: Jan 2025
727 KB Jan 2025
file type icon Control 424C/T – CLF File
updated: Jan 2025
326 KB Jan 2025
Technical Papers
  Size Uploaded
768 KB Nov 2025

If any of the links above result in strange characters in your browser, please right-click the file to save it to your computer.

Parts & Service

Specifications

Frequency Range (-10 dB) 75Hz - 18kHz
Power Capacity 60W (240 W Peak), Cont. Pink Noise (2 hrs.)
40 W (160 W Peak) Cont. Pink Noise Power (100 hrs.)
Sensitivity (1m/1W) 85dB
Coverage Angle 130° conical
Maximum SPL (1m) 103 dB continuous pink noise (109 dB peak)
Nominal Impedance 16Ω
Transformer Taps 70 V: 30 W, 15 W, 7.5 W & 3.7 W
100 V: 30 W, 15 W, 7.5 W
Drivers LF: 100 mm (4 in) with treated paper cone and high-performance magnet
HF: 19 mm (0.75 in) textile soft-dome with Neodymium magnet assembly
Ceiling Cutout Size 168 mm (6.6 in)
Dimensions 182 mm (7.2 in) H x 196 mm (7.7 in) dia.
173 mm (6.8 in) from bottom of ceiling tile to top of backcan
Safety Agency Rating Suitable for use in air handling spaces per UL2043, NFPA 90A & NFPA 70, CSA C22.2 no. 205 and S7232/UL1480A Listed.
Environmental IP33 rating per EN/IEC 60529.
Operating temperature 0°C to 45°C
Optional Accessories JBL-MTC-424BG black (RAL9004) round grille
JBL-MTC-424SG white (RAL9003) square grille
JBL-MTC-424NC new construction bracket
JBL-MTC-424MR mud-ring construction bracket
JBL-MTC-48TRX4 tile rail for 4' x 4' ceiling tiles
Color Stock grille is White (RAL9003), paintable
Net Weight (ea) 2.8 kg (6.2 lbs)
Shipping Weight (pair) 10.57 kg (23.31 lbs)
SKU Numbers JBL-C424C/T

Accessories

MTC-424BG | Round Black Grille for Control 424C/T
MTC-424BG  Main photo
Larger Images
MTC-424BG  detail thumbnail #1 MTC-424BG  detail thumbnail #2 MTC-424BG  detail thumbnail #3
  • Full-face, magnetic grille with tether
  • Sleek and refined look that fits the aesthetic modern designers require

MTC-424SG | Square Grille for Control 424C/T
MTC-424SG  Main photo
Larger Images
MTC-424SG  detail thumbnail #1 MTC-424SG  detail thumbnail #2
  • Full-face, magnetic grille with tether
  • Sleek and refined look that fits the aesthetic modern designers require

News

Support/FAQs

HARMAN Professional Solutions: