Voltage Requirements, Current Requirements

to compensate for hostile conditions on the AC mains:

•suppresses high voltage transients up to several kilovolts

•filters EMI (radio frequencies and noise present on the AC line)

•sustains operation during low-voltage periods, which minimizes audio discontinuity

•provides soft-start power-up, which eliminates high inrush current

The UM-P can withstand continuous voltages up to 264V and allows any combination of voltage to GND (i.e. Neutral-Hot-GND, Hot-Hot-GND). Continuous voltages higher than 264V may damage the unit.

Voltage Requirements

The UM-P operates safely and without audio disconti- nuity if the AC voltage stays within the range 88–264V, 47–63 Hz. After applying AC power, the system is muted while the circuitry charges up and stabilizes. After two seconds, the On/Temp. LED on the user panel illumi- nates green, the system unmutes and is ready to pass audio signals. If the On/Temp. LED does not illuminate or the system does not respond to audio input after ten seconds, consult the Troubleshooting section.

The UM-P’s power supply uses stored energy to continue functioning for about 10 AC cycles if the voltage decreases below 88V (a condition known as brownout). The precise length of time the unit functions during brownout depends on the operating level and how low the voltage drops. The unit turns off if the voltage does not increase above 88V before the storage circuits are depleted. If the UM-P shuts down due to brownout, the power supply automatically turns on after three seconds if the voltage returns to the normal operating range. If the UM-P does not turn back on after ten seconds, consult the Troubleshooting section.

NOTE: We recommend that the supply be operated at least a few volts away from the upper and lower bounds of the operating range to avoid possible shutdown.

Current Requirements

Each UM-P requires approximately 3Arms @115V (1.5Arms@230V) for proper operation, allowing up to five UM-Ps to be powered from one 15A circuit. How- ever, we recommend powering no more than three UM-Ps per 15A branch to allow a 30% margin for peak voltages. The UM-P presents a dynamic load to the AC mains which causes the amount of current to fluctuate be- tween quiet and loud operating levels. This affects the number of UM-Ps that can be used for a given breaker type. Since different types of cables and circuit breakers heat up and trip at varying rates, it is essential to understand the types of current ratings and how they correspond to circuit breaker and cable specifica- tions.

The maximum continuous RMS current is the maximum RMS current over a duration of at least 10 seconds. It is used to calculate the temperature increase in cables, which is used to select cables that conform to electrical code standards. It is also used to select the rating for slow-reacting thermal breakers.

The maximum burst RMS current is the maximum RMS current over a one second duration. It is used to select the rating for most magnetic breakers.

The maximum instantaneous peak current during burst is used to select the rating for fast-reacting magnetic breakers and to calculate the peak voltage drop in long AC cables according to the formula

Vpkdrop = Ipk x Rtotal cable

Use the table below as a guide to select cables and circuit breakers with appropriate ratings for your operating voltage.

UM-P Current Ratings

	115 V		230 V		100 V

Idle RMS	0.25 ARMS		0.13 ARMS		0.3	ARMS
Max. Continuous RMS	2.8	ARMS	1.4	ARMS	3.2	ARMS
Max. Burst RMS	3.2	ARMS	1.6	ARMS	3.7	ARMS
Max. Peak During Burst	5.0	APEAK	2.5	APEAK	5.8	APEAK

To determine the minimum total service power re- quired by a system of UM-P, or other Meyer self-pow- ered speakers, add their maximum continuous RMS currents together. We recommend allowing an addi- tional 30% above the minimum amperage to prevent peak voltage drops at the service entry and nuisance tripping.

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.