The JBL CBT 70J-1 is a high-power, J-shaped line array column loudspeaker that utilizes Constant Beamwidth Technology (CBT) to deliver precise, controlled vertical sound dispersion for demanding fixed installation applications. This innovative design features a curved array of transducers that physically shapes the acoustic wavefront, creating a cylindrical radiation pattern with a sharp vertical focus and a very wide horizontal dispersion. The unique J-shaped curvature of the front baffle is key to its performance, allowing it to provide consistent coverage from the front of the audience all the way to the back, without the significant high-frequency loss over distance typical of conventional speakers. This makes it exceptionally effective in long, reverberant spaces such as cathedrals, auditoriums, performing arts centers, and large atriums.

A primary benefit of the CBT 70J-1 is its ability to maintain a constant directivity index over a broad frequency range, which translates to uniform tonal balance and exceptional speech intelligibility throughout the entire coverage area. The column's pattern control dramatically reduces unwanted energy directed at the ceiling and floor, minimizing problematic reflections and increasing the direct-to-reverberant sound ratio. This results in clearer audio even in challenging acoustic environments. The system is a passive design, requiring external amplification and optional DSP for final system tuning and alignment, but its fundamental beam shaping is achieved through its physical geometry and transducer shading.

The enclosure is constructed from durable, extruded aluminum with a weather-resistant finish, suitable for both indoor and outdoor installation. It includes integrated rigging points for secure flying or wall-mounting. With its combination of high power handling, scientifically engineered directivity, and a form factor that projects sound evenly over long throws, the JBL CBT 70J-1 provides system designers with a powerful tool for achieving uniform, high-fidelity audio coverage in complex architectural spaces where conventional loudspeakers struggle with consistency and clarity.