The JBL PD564 is a professional, high-output, horn-loaded full-range loudspeaker engineered for demanding sound reinforcement applications where long-throw projection and exceptional intelligibility are critical. Its design centers on a 15-inch low-frequency driver integrated with a bi-radial, constant-directivity horn that houses a high-frequency compression driver. This cohesive, horn-loaded architecture provides high acoustic efficiency, enabling the system to deliver significant sound pressure levels with exceptional clarity over long distances, making it an ideal choice for large venues such as performing arts theaters, houses of worship, large conference halls, and outdoor event spaces. The defining feature of this system is its rotatable horn assembly, which allows the 60° by 40° coverage pattern to be oriented in either a horizontal or vertical configuration, providing installers and system designers with crucial flexibility to tailor the speaker's dispersion to the specific geometry of the audience area.

The loudspeaker's performance is characterized by precise control and smooth coverage. The bi-radial horn design ensures consistent frequency response and uniform dispersion throughout its designated pattern, minimizing hot spots and dead zones within the coverage area. This controlled directivity, combined with the high power handling of its transducers, results in exceptional vocal articulation and music reproduction even at high volumes. The enclosure is constructed from durable, void-free plywood and finished with a rugged, textured coating to withstand the demands of both fixed installation and rigorous touring use. Multiple integrated rigging points, including threaded inserts, provide safe and versatile options for flying the cabinet or mounting it on a stand or pole.

As a passive system, the PD564 requires connection to an external amplifier and system processing. Its design is optimized for use with high-quality external signal processing, including active crossovers, equalization, and system-limiting, to fully realize its potential and ensure driver protection. The combination of its rotatable horn for application-specific coverage, horn-loaded efficiency for powerful projection, and robust construction for reliability positions the PD564 as a professional-grade tool for sound engineers and installers who require a versatile, high-performance loudspeaker capable of delivering pristine, controlled sound to expansive audiences.