The JBL Control 424C/T is a high-fidelity, two-way coaxial in-ceiling loudspeaker specifically engineered to deliver uniform acoustic dispersion and pristine clarity across commercial installations. Part of JBL's Enhanced Coverage Series, this premium 4-inch speaker is equipped with JBL's exclusive CRBI™ (Coplanar Radiation Boundary Integrator) technology, an innovative acoustic design that ensures exceptionally smooth and consistent 130-degree conical coverage. By acoustically loading the 4-inch woofer and coaxially mounted 0.75-inch soft-dome tweeter via a specialized boundary integrator plate, CRBI minimizes on-axis hot spots and off-axis cold spots as listeners move throughout a venue. This widespread coverage often translates directly to project cost savings by allowing audio designers to use fewer total fixtures per room without sacrificing the sonic character or volume consistency of background music and paging systems.

Mechanically optimized for rapid and secure architectural integration, the Control 424C/T features a durable, IP33-rated integrated metal enclosure designed to drop safely into most ceiling plenum spaces. The chassis incorporates upgraded terminal covers that offer both top and side exit cable entry options, which can be quickly wired up without tools using captive hand-screws and removable locking Euroblock connectors. To fit securely into a diverse range of ceiling tile thicknesses, it relies on an ultra-reliable, captive dog-ear mounting clamp system alongside an included backing plate and tile rails. For ultimate system flexibility, a built-in 30-watt multi-tap transformer handles distributed 70V and 100V power infrastructures, while a high-impedance 16-ohm direct bypass input lets installers parallel up to four speakers off a standard low-impedance amplifier channel. Visually, the assembly is capped by a bezel-less, full-face white magnetic grille with an integrated safety tether line; this low-profile grille is easily paintable and blends seamlessly into contemporary architectural aesthetics.