UPA-1C UltraSeries Loudspeaker

Features & Benefits


Efficient high power

Ultra-low distortion

Compact and versatile

High clarity and coherence



Long-term reliability



Music playback in discos

Sound reinforcement


Live music clubs

Side fill in concert reinforcement

Theater PA systems

High-power announcing

Paging indoors/outdoors

Designed for a wide variety of sound reinforcement applications, the compact, arrayable UPA-1C allows for controlled coverage of wide areas in theater, club and concert sound reinforcement. The powerful loudspeaker delivers high sound pressure levels with extremely low distortion, for maximum intelligibility and fidelity. The biamplified loudspeaker consists of a proprietary 12-inch low-frequency cone driver in a vented enclosure with an 80° degree high-frequency horn and driver.

The rugged, multiple-ply hardwood cabinet enclosure is fitted with handles and, optionally, aircraft-style rigging pan fittings or threaded nut plates. The UPA-1C requires a high-quality professional stereo power amplifier capable of delivering 250 watts/channel continuously into 8 ohms, with a signal voltage gain of 20 dB (minimum) to 30 dB (maximum).

M-1A Control Electronics Unit

The UPA-1C loudspeaker operates as a system with the M-1A Control Electronics Unit (one per channel). Optimized for the UPA-1C and UM-1C UltraMonitor and pre-aligned at the factory, the M-1A contains frequency response and phase response alignment circuitry, and Meyer Sound's exclusive SpeakerSense driver protection circuitry, incorporating both peak and RMS signal limiting.

A single-channel device operating at line level, the M-1A is intended to be the final component in the signal chain before the power amplifier. Its factory-calibrated SpeakerSense circuitry protects the UPA-1C loudspeaker components from damage due to overheating under high power conditions. This unique circuit continuously monitors the power applied to the UPA-1C drivers, and individually limits the high-frequency and low-frequency outputs when the safe operating limits of the drivers are exceeded. Until the onset of overload, the Speaker-Sense circuitry has no effect on the signal.

Also provided is a switch-selectable Safe function, which widens the safety margin of the system and is intended to be used when extended periods of overload are anticipated. The Safe switch and other setup controls are located behind a cover plate on the M-1A front panel, providing a means of securing the system installer's presets. To enhance the effectiveness of the UPA-1C, the M-1A incorporates sliding filters which band-limit the system response under full-power conditions. This has the effect of discriminating for vocal information in the signal to increase clarity, and is particularly useful when sound pressure levels are high and leakage becomes a problem. For this reason, it is recommended that subwoofers be used with the system if it must pass the full audio frequency range at all times. The preferred choice of subwoofer for the UPA-1C is the Meyer Sound USW-1.






Datasheet (PDF)

Operating Instructions (PDF)

M-1A Operating