Meyer Sound UM-100P, UM-1P User Manual
Operating Instructions
UM-P Series
UM-1P and UM-100P
Self-Powered Loudspeakers
(Serial Numbers 981000 and above)
Copyright © 1997
Meyer Sound Laboratories, Inc.
All rights reserved
Part #: 05.079.008.01 Rev B
Contents
Introduction.......................................................... 3
AC Power ............................................................. 4
The Modular Rear Panel ..................................... 5
Amplification, Limiting, and Cooling System.... 6
Example Application ........................................... 7
Verifying Driver Polarity .................................... 8
Troubleshooting ................................................ 8
Safety Summary .............................................. 11
Rear Panel Connectors .................................... 12
Dimensions ...................................................... 12
Symbols Used
These symbols indicate important safety or operating features in this booklet and on the chassis.
Dangerous voltages:
risk of electric shock
Pour indiquer les risques
résultant de tensions
dangereuses
Zu die gefahren von
gefährliche spanning zeigen
Important operating
instructions
Pour indequer important
instructions
Zu wichtige betriebs-
anweisung und unter-
haltsanweisung zeigen
Frame or chassis
Masse, châssis
Rahmen oder chassis
Protective earth ground
Terre de protection
Die schutzerde
Para indicar azares provengo
de peligroso voltajes
Para indicar importante
funcionar y mantenimiento
instrucciones
Declaration of Conformity According to ISO/IEC Guide and EN 45014
The Manufacturer:
Name: Meyer Sound Laboratories, Inc.
Address: 2832 San Pablo Avenue
Berkeley, California 94702-2204, USA
Conforms to the following Product Specifications:
Safety: EN60065: 1994
EMC: EN55103-1 emmission
EN55103-2 immunity
The product herewith complies with the requirements
of the Low Voltage Directive 73 / 23 / EEC and
the EMC Directive 89 / 336 / EEC.
Office of Quality Manager
Berkeley, California USA
December 23, 1997
Armadura o chassis Tierra proteccionista
Declares that the product:
Product Name: UM-1P, UM-100P
Product Options: All
Environmental Specifications for
Meyer Sound Electronics Products:
Operating temperature: 0
o
to + 45
o
Nonoperating temperature: < -40o C or > +75o C
Humidity: to 95% at 35
Operating Altitude: to 4600 m (15,000 ft)
Nonoperating Altitude: to 6300 m (25,000 ft)
Shock: 30g 11 msec half-sine
on each of 6 sides
Vibration: 10 Hz to 55 Hz (0.010m
peak-to-peak excursion)
Made by Meyer Sound Laboratories
Berkeley, California USA
European Office:
Meyer Sound Lab. GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany
Introduction
Engagement
2
1
2
1
3
Separation
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 W
The drivers, control electronics, and amplifier are integrated 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 between 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 design improvements:
rms/ch).
10 dB 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, respectively . 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
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 misunderstood term: the beamwidth of a horn is the angle at
which the sound pressure at a given frequency decr eases
to half (–6 dB) its on-axis amplitude. Specifying beamwidth using the –6 dB points has been proposed as the
audio industry standard and Meyer Sound adheres to
this definition.
• The amplifier is optimized for the system, providing
substantial power without endangering the drivers.
• The integrated design simplifies setup and installation, eliminates amp racks, and extends the
durability and reliability of the loudspeaker.
• The gain structure between the control electronics
and amplifier is perfectly matched.
NOTE: Unfortunately, beamwidth is often used to describe the angle at which the sound pressure decreased
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.
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
!
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 discontinuity 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. However , we recommend powering no more than three UM-Ps
per 15A branch to allow a 30% mar gin for peak voltages.
The UM-P presents a dynamic load to the AC mains
which causes the amount of current to fluctuate between 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 specifications.
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
Vpk
Use the table below as a guide to select cables and circuit
breakers with appropriate ratings for your operating
voltage.
SMReldI
= Ipk x Rtotal cable
drop
V511 V032 V001
A52.0
SMR
sgnitaRtnerruCP-MU
A31.0
A3.0
SMR
SMR
SMRsuounitnoC.xaM
SMRtsruB.xaM
tsruBgniruDkaeP.xaM
A8.2
A2.3
A0.5
A4.1
SMR
A6.1
SMR
A5.2
KAEP
A2.3
SMR
SMR
KAEP
SMR
A7.3
SMR
A8.5
KAEP
To determine the minimum total service power required by a system of UM-P, or other Meyer self-powered speakers, add their maximum continuous RMS
currents together. We recommend allowing an additional 30% above the minimum amperage to prevent
peak voltage drops at the service entry and nuisance
tripping.
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