Meyer Sound UPA-1P, UPA-2P User Manual
Operating Instructions
UPA-P Series
UPA-1P and UPA-2P
Self-Powered Loudspeakers
(Serial Numbers 981000 and above)
UPA-1P
Copyright © 1997
Meyer Sound Laboratories, Inc.
All rights reserved
Part #: 05.054.017.01 Rev B
Keep these important operating instructions.
Contents
Introduction .................................................. 3
AC Power .................................................... 4
The Modular Rear Panel .................................. 5
Amplification, Limiting, and Cooling System ........ 6
Rigging ......................................................... 7
Full-Range Systems ........................................ 7
Verifying Driver Polarity ................................ 9
Troubleshooting ......................................... 10
Safety Summary ........................................ 12
Rear Panel and Input Modules Drawings ......... 13
Dimensions ............................................... 14
Notes ...................................................... 15
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
Para indicar azares provengo
de peligroso voltajes
Important operating
instructions
Pour indequer important
instructions
Zu wichtige betriebs-
anweisung und unter-
haltsanweisung zeigen
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
October 1, 1994
Frame or chassis
Masse, châssis
Rahmen oder chassis
Armadura o chassis Tierra proteccionista
Protective earth ground
Terre de protection
Die schutzerde
Declares that the product:
Product Name: UPA-1P, UPA-2P
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)
The following Meyer Sound patents apply to the UPA-P:
Des. 271,967 (U.S.A.)
4,152,552 (U.S.A)
2,379,220 (France)
1,591,480 (U.K.)
Other patents pending
Made by Meyer Sound Laboratories
Berkeley, California USA
European Office:
Meyer Sound Lab. GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany
Introduction
The Integrated Design
The Meyer UPA-P Series (UPA-1P, UPA-2P) self-pow-
ered loudspeakers are comprised 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 integrated into a compact, trapezoidal enclosure. The UPA-P
Series is ideally suited for compact, high-powered PA applications, such as main PA, churches, surround systems,
and theatres. In addition the UPA-P is an excellent solution for use under-balcony, ordown-fill, or front fill and
even as a musical instrument speaker.
The UPA-P Series, more than a powered version of the
Meyer UPA-C Series (UPA-1C, UPA-2C), implements these
significant design improvements:
• The gain structure between the control electronics
and amplifier is perfectly matched.
• 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 UPA-P produces flat acoustical phase and amplitude
response, full-range bandwidth, precise imaging, and
exceptional system impulse response. The UPA-P supplies a maximum SPL of 132.5 dB at 1 m with excellent
intelligibility, without the distortion or coloration commonly
exhibited by small PA speakers.
NOTE: In the past, beamwidth was often used to describe
the angle at which the sound pressure decreased 10 dB
from its on-axis amplitude because many listeners perceive -10 dB as a halving in pressure. Meyer Sound
defines beamwidth as the angle at which sound pressure
decreases 6 dB. -6 dB represents the actual halving of
sound pressure. When reading a beamwidth specification, it is essential to determine whether it refers to the 6
or 10 dB points. As the two standards produce 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 problematic.
The UPA-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 UPA-P horns exhibit constant-Q: the beamwidth remains consistent across the horn’s operating frequency
range in both the vertical and horizontal planes. The
UPA-2P horn’s narrow beamwidth (45°H x 45°V) permits precise coverage with minimal interaction between
neighboring array elements. The UPA-1P horn’s wide
horizontal beamwidth (100°H x 40°V) addresses a larger
coverage area with fewer speakers.
Both speakers share the following remarkable attributes:
• uniform frequency response within the beamwidth
• rapid and uniform amplitude attenuation for all
frequencies outside the beam width
• minimal side lobes
The UPA-P Horns: Constant-Q
As a part of its research and development efforts, Meyer
Sound has 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 decreases
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.
!
AC Power
The UPA-P uses a PowerCon locking 3-pole AC mains
connector that prevents inadvertent disconnection. The
unit must have the correct power plug for the AC power
in the area in which it will be used.
Engagement
Separation
length of time the unit will continue to function 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 for 1 to 5 seconds. If the UPA-P
shuts down due to brownout, the power supply automatically turns on if the voltage returns to the normal
operating range. If the UPA-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.
1
2
1
When AC power is applied to the UPA-P, the Intelligent
ACtm supply automatically selects the correct operating
voltage, allowing the UPA-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 UPA-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.
2
3
Voltage Requirements
Current Requirements
Each UPA-P requires approximately 3 Arms @115V
(1.5 Arms@230V) for proper operation, allowing up to
five UPA-Ps to be powered from one 15 A circuit. However, we recommend powering no more than three UPA-Ps
per 15 A branch to allow a 30% margin for peak voltages.
The UPA-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 UPA-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 slowreacting 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
The UPA-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 UPA-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
"
Vpk
= Ipk x Rtotal cable
drop
Use the table below as a guide to select cables and circuit
breakers with appropriate ratings for your operating voltage.
UPA-P Current Ratings
V511V032V001
SMReldIA52.0
SMRsuounitnoC.xaMA8.2
SMRtsruB.xaMA2.3
tsruBgniruDkaeP.xaMA0.5
SMR
SMR
SMR
SMR
A31.0
A4.1
SMR
A6.1
SMR
A5.2
SMR
A3.0
SMR
SMR
A2.3
SMR
A7.3
SMR
A8.5
SMR
To determine the minimum total service power required
by a system of UPA-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.
Power Connector Wiring
Use the following AC cable wiring diagram to create
international or special-purpose power connectors:
Keep all liquids away from the UPA-P to avoid hazards
from electrical shock.
Do not operate the unit with worn or frayed cables;
replace them immediately.
If the UPA-P will be installed outdoors contact Meyer
Sound for information about the rain hood and weather
protection for the drivers and electronics
The Modular Rear Panel
The rear panel of the UPA-P has two slots for processor
modules. The top slot contains the Audio Input and
Control Module; the bottom slot contains the optional
Remote Monitoring System™ (RMS) Module. A blank
plate covers the bottom slot if RMS is not installed. For
drawings of the modules refer to page 13.
Audio Input
There are three, interchangeable Audio Input and Control
Modules with optimized connectors and controls for different applications. Each module has a 24V Fan connector to power an optional fan (see page 7).
AC cable color code
If the colors referred to in the diagram don't correspond to
the terminals in your plug, use the following guidelines:
• Connect the blue wire to the terminal marked with
an N or colored black.
• Connect the brown wire to the terminal marked
with an L or colored red.
• Connect the green and yellow wire to the terminal
marked with an E (or ) or colored green (or green
and yellow).
Safety Issues
Do not use a ground-lifting adapter or cut the AC
cable ground pin.
Each module uses a three-pin, female XLR audio input
connector with a 10 kΩ balanced input impedance wired
with the following convention:
Pin 1 — 220 kΩ to chassis and earth ground (ESD clamped)
Pin 2 — Signal
Pin 3 — Signal
Case — Earth (AC) ground and chassis
Differential Inputs
Pins 2 and 3 carry the input as a differential signal. Use
standard audio cables with XLR connectors for balanced
signal sources. A single audio source can drive multiple
UPA-Ps with a paralleled input loop, creating an unbuffered hardwired loop connection, with negligible loss in
signal level. For example, since the input impedance of
one UPA-P is 10 kΩ, looping 20 UPA-Ps produces a balanced input impedance of 500Ω. With a 150Ω audio source,
the 500Ω load results in only a 2.28 dB loss.
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