The Meyer Sound UPA-1A is a high-performance, compact, wide-coverage loudspeaker from the renowned UltraSeries line, designed as a passive system for use with external amplifiers and system processors. This single 12-inch, two-way enclosure is engineered to deliver exceptional clarity, consistent coverage, and high output in a durable, touring-grade package, making it a staple for fixed installations, touring sound reinforcement, and distributed systems. Its design focuses on precise pattern control and uniform frequency response, utilizing a carefully matched 12-inch low-frequency driver and a high-frequency compression driver coupled with a rotatable constant-directivity horn. This horn can be positioned to provide either 50° x 100° or 100° x 50° dispersion, allowing system designers to tailor the coverage pattern horizontally or vertically to suit the venue geometry without changing the physical orientation of the cabinet.

The passive nature of the UPA-1A requires it to be driven by a high-quality external amplifier and, critically, managed by a compatible Meyer Sound system processor such as the LD-1A, LD-2, or later Galileo units. This processor provides the essential, speaker-specific electronic tuning, including crossover filtering, driver equalization, time alignment, and comprehensive system protection. This integration ensures the speaker performs exactly as its acoustic designers intended, maintaining phase coherence, optimal power handling, and the signature Meyer Sound sonic character characterized by transparency, dynamic range, and accurate reproduction. The enclosure itself is constructed from rugged, void-free Baltic birch plywood with a textured, black architectural coating and a robust steel grille, built to withstand the physical demands of rigorous use.

Known for its reliability and sonic excellence, the UPA-1A excels in applications ranging from front-of-house main PA elements and side fills to under-balcony fills and distributed systems in theaters and houses of worship. Its combination of manageable size, precise coverage control, and the requirement for external processing underscores a system-oriented philosophy where the loudspeaker, electronics, and tuning are treated as a single, optimized unit. When properly powered and processed, the UPA-1A delivers a powerful, articulate, and predictable performance that has made it a reference standard for engineers seeking a compact, versatile, and supremely accurate passive loudspeaker solution.