Meyer Sound UM-1 User Manual

UM-1C

The UltraMonitor delivers the final

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Features

High gain-before-feedback

Ultra-low distortion

Ultra-flat frequency response

Rugged and reliable

Applications

Stage Monitoring

Clubs and concerts

Low-throw coverage

Fill coverage

UltraMonitor™

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Inches

word on high-powered, critical monitoring.
Specifically designed for touring reinforce­ment, the highly accurate, rugged UM-1C
biamplified system consists of a proprietary
12-inch low-frequency driver in a vented
enclosure, and a symmetrical pattern 45­degree high-frequency horn with driver.

The UM-1C proprietary drivers provide
exceptional efficiency and power handling,
with ultra-low distortion for high clarity.
Very flat frequency response allows control
of feedback at high sound levels.

The sturdy, multi-ply hardwood enclo­sure with textured finish withstands road
abuse. The unit comes with handles and,
optionally, aircraft-style rigging pan fittings.

The UltraMonitor requires a high­quality professional stereo power amplifier
capable of delivering up to 250 watts per
channel continuously into 8 ohms, with a
signal voltage gain of 20dB (minimum)
to 30dB (maximum).

Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
[phone]
FAX [phone]

UM-1C Specifications

Acoustical – UM-1C/M-1A System

Frequency Response
Maximum SPL

1

2

with amplifier rated at: 250 W/8 ohms/ch. 60 W/8 ohms/ch.

70-18,000 Hz +4 dB

Continuous 125 dB 120 dB
Peak 135 dB 126 dB

HF Coverage, -6dB points 45 degrees symmetrical

UM-1C Loudspeaker

Transducers

Low Frequency MS-12 12-inch cone driver, 8 ohms

High Frequency MS-1401B 1.4-inch throat driver, 16 ohms
High-Frequency Horn 45 degree constant-directivity
HF Network Y-1PD

Function DC blocking and passive filters with alternate connection

terminal to adjust VHF response (16k peak or flat)
Enclosure 0.8 cu. ft. vented, multi-ply Finnish birch
Finish Black textured
Protective Grill Perforated steel screen, charcoal-grey foam covering
Connector Cannon EP-4 male, EP-5 male (Europe only)
Rigging (optional) Aircraft pan fittings or
Physical Dimensions 14" W x 14" H x 22

3

⁄8"-16 nut plates

1

⁄2" D

Weight 67 lbs. (30.4 kg)

M-1A Control Electronics Unit

Input Type Balanced (active), 47K ohms
Output Type Active push-pull, will drive 600 ohms
Maximum Input/Output Level

Balanced +26 dBu
Unbalanced +20 dBu

Hum and Noise

3

<-90 dBV
Dynamic Range 120 dB
Sense Inputs 10k ohms true differential, opto-isolated
Electronic Crossover Frequency 1600 Hz
Low-Frequency Delay Type Active all-pass
Driver Protection Circuitry

Low Frequency RMS limiter
High Frequency RMS limiter

VHF Peak limiter
Indicators

Sense, Hi and Lo Green LEDs
Limit, Hi, Lo, and VHF Red LEDs
Safe Green LEDs
Power Supply, Positive and Negative Green LEDs

Controls

Front Panel Input level control, AC on/off switch
Preset Panel VHF control, Lo Cut switch, Safe switch, VHF switch

Connectors

Balanced Inputs/Outputs 3-pin XLR (A-3), RTS
Subwoofer Circuit Input Unbalanced,

1

⁄4" phone jacks

1

⁄4" phone jack

(inserts Lo Cut, disables Level control)

Sense Inputs Banana jacks

Note 1:
Measured 1 meter on-axis,
half-space conditions,
pink noise input, in third­octave bands.

Note 2:
Loudspeaker driven with
weighted noise.

Note 3:
“A”- weighted, unbalanced.

Power 120/240V AC, 50/60 Hz (internally switchable)
Physical Dimensions 19" W x 1

3

⁄4" H x 73⁄4" D Standard rack mount

Weight 8 lbs. (3.6 kg)