The JBL 8340A is a professional passive cinema surround speaker engineered specifically for commercial movie theater installations as part of a complete JBL Screen Array or Professional Cinema sound system. It is designed to deliver the precise, dynamic, and immersive surround sound effects that are a critical component of the modern cinematic experience. As a bi-radial horn speaker, it provides controlled, wide dispersion of sound to ensure consistent coverage throughout the seating area, enveloping the audience in the audio environment of the film. Its robust construction is built to withstand the continuous high-output demands of commercial playback while maintaining clarity and detail at both whisper-quiet and thunderously loud levels.

The speaker incorporates JBL's proprietary technological advancements for cinema applications. It typically features a high-frequency compression driver coupled to a patented symmetrical bi-radial horn. This horn design ensures uniform horizontal and vertical dispersion, minimizing "hot spots" and ensuring that surround panning effects move smoothly and convincingly across the auditorium. The low-frequency section is handled by a high-power, long-excursion woofer in a ported enclosure, capable of reproducing the deep, impactful bass required for full-range effects. The crossover network is precisely tuned to provide seamless integration between the drivers, resulting in a coherent and accurate sound field.

Designed for integration into multi-speaker surround arrays, the 8340A is built for easy mounting on walls or ceilings, with hardware accommodating standard cinema rigging practices. Its passive design requires connection to a high-quality, high-power external amplifier, allowing system designers to tailor the amplification to the specific size and acoustics of the auditorium. With its focus on reliability, consistent performance, and adherence to the exacting standards of commercial cinema sound, the JBL 8340A serves as a trusted component for delivering the immersive, directional, and ambient sound cues that complete the storytelling power of film.