Meyer Sound MSL-6 User Manual
Operating Instructions
MSL-6
Self-Powered Loudspeaker System
Copyright © 1997 Meyer Sound Laboratories, Inc.
All rights reserved
Part # 05.053.026.01 Rev A
Contents
Introduction .......................................................... 3
AC Power .............................................................. 3
Audio Input ........................................................... 5
Amplification and Protection Circuitry ............... 6
Rigging .................................................................. 7
Measurement and System Integration ............... 8
Complete Systems ............................................ 8
Driver Troubleshooting................................... 10
Dimensions ...................................................... 12
Physical Construction ..................................... 12
Safety Summary.............................................. 13
Controls and Connectors ................................ 14
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
Frame or chassis
Masse, châssis
Rahmen oder chassis
Armadura o chassis Tierra proteccionista
Protective earth ground
Terre de protection
Die schutzerde
Declaration of Conformity
According to ISO/IEC Guide and EN 45014
Name: Meyer Sound Laboratories
Address: 2832 San Pablo Avenue
Berkeley, California 94702-2204, USA
conforms to the following Product Specifications:
Safety: EN 60065: 1994
EMC: EN 55022: 1987 - Class A
IEC 801-2: 1984 - 8 kV
IEC 801-3: 1984 - 3 V/m
IEC 801-4: 1984 - 0.5 kV Signal Lines,
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, 1995
Made by Meyer Sound, Berkeley, CA, USA
European Office:
Meyer Sound Germany
GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany
1.0 kV Power Lines
declares that the product:The Manufacturer:
Product Name: MSL-6
Product Options: All
Environmental Specifications for
Meyer Sound Electronics Products
Operating temperature:0° C to +45° C
Nonoperating temp: < –40° C or > +75° C
Humidity: to 95% at 35°C
Operating altitude: to 4600 m (15,000 ft)
Nonoperating altitude: to 6300 m (25,000 ft)
Shock: 30 g 11 msec half-sine
on each of 6 sides
Vibration: 10 – 55 Hz (0.010 m
peak-to-peak excursion)
LISTED
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®®
3K59
COMMERCIAL
AUDIO SYSTEM
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2
Introduction
AC Power
The MSL-6, Meyer Sound’s largest self-powered speaker ,
is ideally suited for large-scale vocal public address
applications as a stand-alone system, and for musical
sound reinforcement in combination with Meyer selfpowered subwoofers and/or the DS-2P mid-bass speaker .
The MSL-6 features a 25° vertical coverage angle,
permitting long-throw arrays with up to three vertical
rows with minimal overlap between coverage areas.
The center and outer high frequency horns utilize
separate amplifier and control electronics to achieve a
30° horizontal coverage angle for a single MSL-6. Tightpacking two units together yields a 60° coverage angle.
Since the MSL-6 is intended for tight-packing only, array
design is simple and modular: each additional unit
increases the horizontal coverage by 30°. The maximum
horizontal array size is twelve units, resulting in a
circular array with 360° coverage.
The MSL-6 contains amplifier and control electronics
for two 12” low frequency cone drivers and three high
frequency horn drivers (2” throat, 4” diaphragm) in a
compact trapezoidal cabinet. Each 12” driver is independently amplified and contained in a horn-loaded
vented enclosure. This integrated design improves
performance, durability, and reliability, eliminates
amplifier racks, and simplifies setup and installation.
The MSL-6 can be equipped to operate with the Remote
Monitoring System (RMS™) network and software
application. RMS displays signal and power levels, driver
and cooling fan status, limiter activity, and amplifier
temperature for all speakers in the network on a W indowsbased PC. Contact Meyer Sound for more information
about RMS.
When AC power is applied to the MSL-6, the Intelligent
AC™ supply automatically selects the correct operating
voltage, allowing the MSL-6 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 common mode and deference mode radio
frequencies (EMI)
• sustains operation during low voltage periods
• provides soft-start power-up, which eliminates
high inrush current
The MSL-6 can withstand continuous voltages up to
275 V and allows any combination of voltage to GND
(i.e. Neutral-Hot-GND, Hot-Hot-GND). Continuous
voltages higher than 275 V may damage the unit.
The MSL-6 uses a NEMA L6-20P or IEC 309 male power
inlet and satisfies UL, CSA, and EC safety standards.
Voltage Requirements
The MSL-6 operates safely and without audio discontinuity if the AC voltage stays within either of two operating
windows: 85–134 V or 165–264 V, at 50 or 60 Hz. After
applying AC power, the proper operating voltage is
automatically selected, but the system is muted. During
the next three seconds, the primary fans turn on, the
main power supply slowly ramps on, the green Active
LED on the user panel illuminates, and the system is
enabled to pass audio signals.
TROUBLESHOOTING NOTE: If the Active LED does
not illuminate or the system does not respond to audio
input after ten seconds, remove AC power. Electronics
technicians with access to a test bench can contact
Meyer Sound to receive
Series MP-2 and MP-4 Field Verification Procedure
(part # 17.022.066.01). This service document contains
a series of tests to verify that the power supply and
amplifier are functioning properly. Other users should
contact Meyer Sound or an authorized service center.
The Meyer Sound Self-Powered
3
If the voltage decreases below the lower bound of either
operating range (brown-out), the supply uses stored
energy to continue functioning briefly . The unit turns off
if the voltage does not increase above the threshold
before the storage circuits are depleted. The time that the
MSL-6 continues to operate during brown-out depends
on how low the voltage drops and the audio source level
during this period.
If the voltage fluctuates within either operating range,
automatic tap selection stabilizes the internal operating
voltage. This tap selection is instantaneous and there are
no audible artifacts. If the voltage increases above the
upper bound of either range, the power supply turns off
rapidly, preventing damage to the unit.
If the MSL-6 shuts down due to either low or high
voltage, the power supply automatically turns on after
three seconds if the voltage has returned to either normal
operating range. If the MSL-6 does not turn back on after
ten seconds, remove AC power and r efer to the
SHOOTING NOTE
NOTE: We recommend that the supply be operated at
least a few volts away from either window’s upper and
lower bounds so that small AC voltage variations do not
cause the supply to cycle on and off.
above.
TROUBLE-
Use the table below as a guide to select cables and circuit
breakers with appropriate ratings for your operating
voltage.
sgnitaRtnerruC6-LSM
V511 V032 V001
SMRsuounitnoC.xaM
SMRtsruB.xaM
A41
A62
tsruBgniruDkaeP.xaM
A83
A7
SMR
A31
SMR
A81
KAEP
A61
SMR
SMR
KAEP
SMR
A03
SMR
A24
KAEP
The minimum electrical service amperage required by a
system of MSL-6s is the sum of their maximum
continuous RMS current. We recommend allowing an
additional 30% above the minimum amperage to prevent
peak voltage drops at the service entry.
TROUBLESHOOTING NOTE: In the unlikely case that
the circuit breakers trip (the white center buttons pop
out), do not reset the breakers! Contact Meyer Sound for
repair information.
Power Connector Wiring Conventions
Current Requirements
The MSL-6 presents a dynamic load to the AC mains
which causes the amount of current to fluctuate between
quiet and loud operating levels. Since different types of
cables and circuit breakers heat up 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 in a period 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 in a period of approximately 1 second. 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
Use the following AC cable wiring diagram to create
international or special-purpose power connectors:
blue =
neutral
yellow/green =
earth ground
(chassis)
AC cable color code
brown = hot
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).
Vpk
= Ipk x Rtotal cable
drop
4
Safety Issues
Pay close attention to these important electrical and
safety issues.
Use a power cord adapter to drive the MSL-6
from a standard 3-prong outlet
(NEMA 5-15R;125 V max).
earth
ground
chassis
ground
The MSL-6 requires a grounded outlet. Always
use a grounding adapter when connecting to
ungrounded outlets.
Audio Input
The MSL-6 presents a 10 kΩ balanced input impedance to
a three-pin XLR connector 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
Pins 2 and 3 carry the input as a differential signal; their
polarity can be reversed with the input polarity switch
on the user panel. If the switch is in the up position,
pin 2 is hot relative to pin 3, resulting in a positive
pressure wave when a positive signal is applied to pin 2.
Use standard audio cables with XLR connectors for
balanced signal sources.
TROUBLESHOOTING NOTE: Shorting an input connector
pin to the case can form a ground loop and cause hum.
If other abnormal noises (hiss, popping) are produced
from the loudspeaker, disconnect the audio source from
the speaker. If the noise stops, then the problem is not
within the loudspeaker; check the audio input and AC
power.
Differential Inputs
Do not use a ground-lifting adapter or cut the AC
cable ground pin.
Keep all liquids away from the MSL-6 to avoid hazards
from electrical shock.
Do not operate the unit if the power cables are frayed or
broken.
Tie-wrap anchors on the amplifier chassis provide strain
relief for the power and signal cables. Insert the plastic
tie-wraps through the anchors and wrap them around
the cables.
A single sour ce can drive multiple MSL-6s with a paralleled input loop, creating an unbuffered har dwired loop
connection. Make certain that the source device can
drive the total load impedance presented by the paralleled input circuit. For example, since the input impedance of a single MSL-6 is 10 kΩ, cascading 20 units
produces a balanced input impedance of 500 Ω. If a 150 Ω
source is used, the 500 Ω load results in a 2.28 dB loss.
5
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