Meyer Sound UM-100P, UM-1P manual Introduction, AC Power, Integrated Design, UM-P Horns Constant-Q

Introduction

The Integrated Design

The Meyer UM-P Series (UM-100P, UM-1P) self- powered stage monitors are composed of:

•one 12-inch cone driver and one 3-inch diaphragm compression driver;

•phase-corrected, optimized control electronics;

•a two-channel amplifier (350 Wrms/ch).

The drivers, control electronics, and amplifier are inte- grated into a compact enclosure. The UM-P Series is intended to be used as a stage monitor but can also be used as a mid-hi and musical instrument speaker.

The UM-1P horn’s narrow beamwidth (45°H x 45°V) permits precise coverage with minimal interaction be- tween neighboring monitors. The UM-100P horn’s wide horizontal beamwidth (100°H x 40°V) addresses a larger coverage area with fewer speakers.

The UM-P Series, more than a powered version of the Meyer Ultra-monitor, implements these significant de- sign improvements:

•The amplifier is optimized for the system, providing substantialpowerwithoutendangeringthedrivers.

•The integrated design simplifies setup and in- stallation, eliminates amp racks, and extends the durability and reliability of the loudspeaker.

•The gain structure between the control electronics and amplifier is perfectly matched.

The UM-P produces flat acoustical phase and amplitude response, full-range bandwidth, precise imaging, and exceptional system impulse response.

The UM-P Horns: Constant-Q

In a recent research and development effort, Meyer Sound solved the most difficult problems associated with horn design. In order to appreciate the significance of this work, it is necessary to define an often misunder- stood term: the beamwidth of a horn is the angle at which the sound pressure at a given frequency decreases to half (–6 dB) its on-axis amplitude. Specifying beam- width using the –6 dB points has been proposed as the audio industry standard and Meyer Sound adheres to this definition.

NOTE: Unfortunately, beamwidth is often used to de- scribe the angle at which the sound pressure decreased

10dB from its on-axis amplitude because many listeners perceive this as a decrease to half the SPL. When reading a beamwidth specification, it is essential to determine whether it refers to the –6 or –10 dB points because they indicate very different results: the –10 dB points yield a wider angle.

Previous technologies produced horns whose beamwidth varied over the operating frequency range. These horns also displayed nonuniform frequency response within, and significant side lobe energy outside their beamwidth. Both undesirable characteristics, particularly prevalent for horns with a wide beamwidth, make array design extremely uproblemactic

The UM-P was developed in Meyer Sound’s anechoic chamber by measuring coverage patterns using angular and frequency resolutions of 1° and 1¦36 octave, respec- tively. The UM-P horns exhibit constant-Q: the beamwidth remains consistent across the horn’s operating frequency range in both the vertical and horizontal planes.

Both horns share the following remarkable attributes:

•uniform frequency response within the beamwidth

•rapid and uniform amplitude attenuation for all frequencies outside the beamwidth

•minimal side lobes

AC Power

The UM-P uses a PowerCon locking 3-pole AC mains connector that prevents inadvertent disconnection. The unit must have the correct power cord for the AC power in the area in which it will be used.

Engagement	Separation
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2	2
1	3

When AC power is applied to the UM-P, an Intelligent ACtm supply automatically selects the correct operating voltage, allowing the UM-P to be used internationally without manually setting voltage switches. The Intelligent AC supply performs the following protective functions

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