The JBL Control 424C/T is a two-way coaxial ceiling loudspeaker incorporating a 4-inch woofer within an integrated enclosure designed for installation in standard ceiling plenum spaces. It features Coplanar Relative Bi-Radial Intensity (CRBI) technology, providing a uniform 130° coverage angle that improves sound dispersion by minimizing on-axis peaks and off-axis dips. The speaker includes an internal transformer compatible with 70V/100V distributed audio systems as well as low-impedance configurations. Mechanical design enhancements include terminal covers with both top and side cable entry ports, secured by captive hand-screws, and a dogear mounting system adaptable to a range of ceiling thicknesses.

• Coaxially mounted 100mm woofer and 19mm soft-dome tweeter
• Integrated enclosure for ceiling plenum installation
• CRBI technology for consistent 130° coverage
• Built-in 70V/100V multi-tap transformer and 16-ohm direct input
• Full-face paintable magnetic grilles
• Top and side exit cable entry options
• Robust adaptable dogears for various ceiling thicknesses
• IP33 rated

Frequency Range	75 Hz – 18 kHz
Power Capacity	120 W continuous program (2 hrs), 60 W (240 W peak) continuous pink noise (2 hrs), 40 W (160 W peak) continuous pink noise power (100 hrs)
Sensitivity	85 dB
Coverage Angle	130° conical
Maximum SPL (1m)	103 dB continuous pink noise (109 dB peak)
Nominal Impedance	16 ohms
Transformer Taps	70 V: 30 W, 15 W, 7.5 W & 3.7 W; 100 V: 30 W, 15 W, 7.5 W
LF Driver	100 mm (4 in)
HF Driver	19 mm (0.75 in)
Safety Agency Rating	Suitable for use in air handling spaces per UL1480A, UL2043, NFPA90 & NFPA70, S7232/UL Listing, Speakers for Commercial and Professional Use, CSA C22.2 no. 205, IEC60849/EN60849 compliant
Environmental	Exceeds Mil Spec 810H for humidity, salt spray, temperature & UV; IP33 rating (EN/IEC 60529); RoHS2 compliant (EN/IEC63000); Operating temperature 0°C to 45°C