The JBL Control 321CT is a passive 12" coaxial ceiling speaker with a multi-tap transformer designed for voice amplification and foreground music reproduction in waiting rooms, offices, retail stores, and restaurants. With a low-saturation transformer for compatibility with a 70V/100V power amplifier (available separately), this 2-way speaker provides a long-term power capacity of 250W (1000W peak). The Control 321CT is equipped with a durable 12" Kevlar-reinforced cone and a titanium-diaphragm compression driver, yielding an extended frequency response of 47 Hz to 16 kHz.

The cone, which also serves as a waveguide, results in reliable 90° broadband coverage while the built-in crossover network ensures proper frequency distribution to the speaker components. A removable locking connector with screw-down terminals ensures easy wiring at the desired power tap setting.