Amplification, Limiting, and Cooling System

Looping, Polarity, and Attenuating Audio Input Module

This module has a balanced, female XLR audio input connector, a male XLR loop connector, an input polarity switch, and a level attenuator knob. With the input polarity switch in the up (+) position, pin 2 is hot relative to pin 3, resulting in a positive pressure wave when a positive signal is applied to pin 2. With the switch down (–), pin 3 is hot relative to pin 2, resulting in a negative pressure wave when a positive signal is applied to pin 2. The level attenuator knob operates between 0 dB (no level attenuation) in a fully clock- wise position to –12 dB in a fully counter-clockwise position.

Remote Monitoring System

The UM-P can be equipped to operate with the Remote Monitoring System (RMS) network and software ap- plication. RMS displays signal and power levels, driver and cooling fan status, limiter activity, the state of the polarity switch, attenuator level, and amplifier tem- perature for all speakers in the network on a Windows- based PC. RMS is an excellent field-diagnostic tool that removes the guesswork from troubleshooting during a performance. All Meyer RMS-compatible speakers use the same RMS module so they can be easily exchanged between speakers (depicted on back page). Installing an RMS module requires only a Phillips screwdriver. Contact Meyer Sound for more information about RMS.

Amplification, Limiting, and Cooling System

Amplification and Limiting

Each driver in the UM-P is powered by one channel of a proprietary Meyer Sound amplifier utilizing comple- mentary power MOSFET output stages (classAB, bridged, 350 Wrms/ch). Each channel has a limiter that prevents driver over-excursion and regulates the temperature of the voice coil. The limiters protect the drivers without the glaring compression effects imposed by typical limiters, allowing high SPLs across each driver’s entire frequency range. Limiter activity for the high and low channels is indicated by two yellow Limit LEDs on the rear panel (the high limit is above the low limit LED).

The UM-P performs within its acoustical specifications and operates at a normal temperature if the limit LEDs

are on for no longer than two seconds, and off for at least one second. If either LED remains on for longer than three seconds, that channel incurs these negative consequences:

•Increasing the input level will not increase the volume.

•The system distorts due to clipping and nonlinear driver operation.

While the UM-P limiters fully protect the system under overload conditions and exhibits smooth sonic charac- teristics, we recommend that you do not intentionally drive the UM-P into continuous limiting to attain com- pression effects.

For applications where large amounts of compression are required, we recommend using an outboard com- pressor/limiter for greater control of limit and com- pressor effects.

Amplifier Natural Convection Cooling System

The UM-P employs a natural convection cooling sys- tem that depends on air flow from below the cabinet over the heatsink. Allow for proper ventillation of fresh air when using the speaker.

If the temperature of the heatsink reaches 85°C (185°F), the On/Temp. LED on the rear panel turns from green (On) to red (Temp.) and the limiter threshold is lowered to a safe level to prevent the amplifiers from overheat- ing. Under high temperature conditions the limiter thresholdisreducedto6dB. Whentheheatsinktmeperature decreases to 75°C (167°F), the On/Temp. LED changes from red to green and the limiter threshold returns to normal.

!The heatsink gets too hot to touch during normal operation. Use extreme caution when approaching the rear of the cabinet.

Fan Assembly Kit

While convection cooling is adequate for most appli- cations, driving the UM-P into frequent limiting under severe temperature conditions, or where ventilation is restricted, an optional fan kit is available to maintain a safe operating temperature:

The easy-to-install fan, powered by the 24V Fan rear panel connector, blows air directly onto the heatsink. The fan speed increases as the heatsink temperature rises, which maintains a safe operating temperature with minimal fan noise. Contact Meyer Sound to order the fan kit.

UM-100P, UM-1P specifications

Meyer Sound, a leader in professional audio technology, has produced a range of high-performance stage monitors, among which the UM-1P and UM-100P models stand out for their exceptional sound fidelity and robust design. These monitors are engineered to deliver precise audio reproduction, making them ideal for live performances, studio recordings, and various sound reinforcement applications.

The Meyer Sound UM-1P is a self-powered, wide-range stage monitor that excels in providing a stable and consistent sound quality. Its compact, low-profile design ensures that it fits well in any stage setting while also maintaining visual appeal. One of its key features is the proprietary high-frequency compression driver, which allows for incredible clarity and detail in vocal performances. The UM-1P is notable for its low distortion and extended frequency response, ensuring that artists hear themselves accurately, even in the most demanding acoustic environments.

On the other hand, the UM-100P model is slightly larger and more powerful, designed for a variety of performance settings. It features dual input connections, enabling flexible integration with different audio systems. The UM-100P utilizes Meyer Sound's patented low-frequency technology, which delivers tight and impactful bass performance without compromising clarity in the mid and high frequencies. The advanced crossover design ensures that sound remains consistent across the entire frequency range, making it a preferred choice for discerning sound engineers.

Both models incorporate Meyer Sound's legendary build quality, ensuring durability and reliability during rigorous touring schedules. The sturdy cabinets are designed to withstand the rigors of active use while minimizing unwanted resonances. Additionally, the built-in power amplifiers are optimized for each speaker, providing sufficient headroom and protection against overheating.

Another standout feature is the ease of setup and integration with other Meyer Sound products. These monitors can be seamlessly combined with Meyer Sound’s broader speaker systems, creating an integrated audio experience ideal for any venue.

In summary, the Meyer Sound UM-1P and UM-100P are indispensable tools for professional audio applications, offering unparalleled sound quality, durability, and versatility. With their innovative technologies and meticulous engineering, these stage monitors continue to elevate live performance experiences worldwide.