Meyer Sound MTS-4A User Manual

OPERATING INSTRUCTIONS

MTS-4A Self-Powered Loudspeaker Systems

Superior
engineering
for the art
and science

OPERATING INSTRUCTIONS

of sound.



Keep these important operating instructions

Check www.meyersound.com for updates

CONTENTS

Safety Summary 3
The MTS-4A: Introduction 4
AC Power 4
Audio Input 6
Amplification and Protection Circuitry 6
Rigging 7
Measurement and System Integration Tools 8
Complete Systems 8
Driver Troubleshooting 9
Array Design 10
MTS-4A Specifications 12
MTS-4A Dimensions 13
Contact Information 14

SYMBOLS USED

T

HESE 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

DECLARATION OF CONFORMITY ACCORDING TO ISO/IEC GUIDE AND EN 45014

The Manufacturer:

EYER SOUND LABORATORIES, INC.

M

2832 San Pablo Avenue
Berkeley, California 94702-2204, USA

Declares that the product:

MTS-4A

Conforms to the following Product Specifications
Safety: EN60065: 1994
EMC: EN55103-1 emmission
EN55103-2 immunity
This device complies with the requirements of the Low Voltage
Directive 73 / 23 / EEC and the EMC Directive 89 / 336
/ EEC.
This device also complies with EN 55103-1 & -2. Operation is
subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including

interference that may cause undesired operation.

1

2

E

NVIRONMENTAL SPECIFICATIONS FOR MEYER SOUND ELECTRONICS PRODUCTS:

Operating Temperature

Nonoperating Temperature

Humidity

Operating Altitude

Nonoperating Altitude

0° to + 45°
<-40°C or > +75°C
to 95% at 35°C
to 4600 m (15,000 ft)
to 6300 m (25,000 ft)
30g 11 msec half-sine on each

Shock

of 6 sides

Vibration

10Hz to 55Hz (0.010m
peak-to-peak excursion)

Protective earth ground

Terre de protection

Die schutzerde

Tierra proteccionista

3K59 COMMERCIAL

AUDIO SYSTEM

Made by Meyer Sound Laboratories
Berkeley, California USA

European Office:
Meyer Sound Lab. GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany

N757 MTS-4A

Office of Quality Manager
Berkeley, California USA Dec 22, 2000

2

!

SAFETY SUMMARY

ENGLISH

• To reduce the risk of electric shock,
disconnect the unit from the AC
mains before installing audio cable.
Reconnect the power cord only after
making all signal connections.

• Connect the unit to a two-pole, three
wire grounding mains receptacle. The
receptacle must be connected to a
fuse or circuit breaker. Connection to
any other type of receptacle poses a
shock hazard and may violate local
electrical codes.

• Do not allow water or any foreign
object to get inside the unit. Do not
put objects containing liquid on, or
near, the unit.

• To reduce the risk of overheating
the unit, avoid exposing it to direct
sunlight. Do not install the unit near
heat-emitting appliances, such as a
room heater or stove.

• This unit contains potentially
hazardous voltages. Do not attempt
to disassemble the unit. The unit
contains no user-serviceable parts.
Repairs should be performed only by
factory-trained service personnel.

RANÇAIS

F

• Pour réduire le risque d’électrocution,
débrancher la prise principale de
appareil, avant d’installer le câble
d’interface allant à l’audio. Ne
rebrancher le bloc d’alimentation
qu’après avoir effectué toutes les
connections.

• Branchez appareil dans une prise de
courant à 3 dérivations (deux pôles et
la terre). Cette prise doit être munie
d’une protection adéquate (fusible ou
coupe-circuit). Le branchement dans
tout autre genre de prise pourrait
entraîner un risque d’électrocution et
peut constituer une infraction à la
réglementation locale concernant les
installations électriques.

• Ne pas laisser de l’eau ou tout objet

pénétrer dans appareil. Ne pas placer
de r´cipients contenant un liquide sur
cet appareil, ni à proximité de celui­ci.

• Pour éviter une surchauffe de
appareil, conserver-la à l’abri du
soleil. Ne pas installer à proximité
d’appareils dégageant de la chaleur
tels que radiateurs ou appareils de
chauffage.

• Ce appareil contient des circuits haute
tension présentant un danger. Ne
jamais essayer de le démonter. Il
n’y a aucun composant qui puisse
être réparé par l’utilisateur. Toutes
les réparations doivent être effectuées
par du personnel qualifié et agréé par
le constructeur.

D

EUTSCH

• Um die Gefahr eines elektrischen
Schlages auf ein Minimum zu
reduzieren, den Gerät vom Stromnetz
trennen, bevor ggf. ein
Audio-Schnittstellensignalkabel
angeschlossen wird. Das Netzkabel
erst nach Herstellung aller
Signalverbindungen wieder
einstecken.

• Der Gerät an eine geerdete zweipolige
Dreiphasen-Netzsteckdose
anschließen. Die Steckdose muß
mit einem geeigneten Abzweigschutz
(Sicherung oder Leistungsschalter)
verbunden sein. Der Anschluß der
unterbrechungsfreien Stromversorgung
an einen anderen Steckdosentyp kann
zu Stromschlägen führen und gegen
die örtlichen Vorschriften verstoßen.

• Darauf achten, daß weder Wasser
noch Fremdkörper in das Innere den
Gerät eindringen. Keine Objekte, die
Flüssigkeit enthalten, auf oder neben
die unterbrechungsfreie
Stromversorgung stellen.

• Um ein Überhitzen dem Gerät zu
verhindern, das Gerät vor direkter
Sonneneinstrahlung fernhalten und

nicht in der Nähe von
wärmeabstrahlenden Haushaltsgeräten
(z.B. Heizgerät oder Herd) aufstellen.

• Im Inneren diesem Gerät herr-schen
potentiell gefährliche Spannungen.
Nicht versuchen, das Gerät zu öffnen.
Es enthält keine vom Benutzer
reparierbaren Teile. Reparaturen
dürfen nur von ausgebildetem
Kundenienstpersonal durchgeführt
werden.

E

SPAÑOL

• Para reducir el riesgo de descarga
eléctrica, desconecte de la red el
aparato antes de instalar el cable de
señalización de interfaz de la segnale.
Vuelva a conectar el conductor
flexible de alimentación solamente
una vez efectuadas todas las
interconexiones de señalizatción.

• Conecte el aparato a un tomacorriente
bipolar y trifilar con neutro de
puesta a tierra. El tomacorriente
debe estar conectado a la protección
de derivación apropiada (ya sea un
fusible o un disyuntor). La conexión
a cualquier otro tipo de tomacorriente
puede constituir peligro de descarga
eléctrica y violar los códigos
eléctricos locales.

• No deje que en el aparato entre agua
ni ningún objeto extraño. No ponga
objetos con líquidos encima de la
unidad ni cerca de ella.

• Para reducir el riesgo de
sobrecalentamiento, no exponga la
unidad a los rayos directos del sol
ni la instale cerca de artefactos que
emiten calor, como estufas o cocinas.

• Este aparato contiene niveles de voltaje
peligrosos en potencia. No intente
desarmar la unidad, pues no contiene
piezas que puedan ser repardas por
el usuario. Las reparaciones deben
efectuarse únicamente por parte del
personal de mantenimiento capacitado
en la fábrica.

3

THE MTS-4A: INTRODUCTION

The Meyer MTS-4A self-powered loudspeaker is a compact,
self-contained, full-range system suited for clubs and small
theatres (throw distances less than 100 ft). Its trapezoidal
shape facilitates array design that maximizes coverage and
SPL for the size of the array. Since all frequencies are produced
from one cabinet, the MTS-4A better approximates a point­source radiator, creating a smoother frequency image than
separate mid-hi and subwoofer cabinets. The MTS-4A can be
used as a PA, front-fill, bass, and keyboard speaker, and as a
side-fill and drum monitor.

The MTS-4A contains independent amplifier and control
electronics for three low frequency cone drivers (18”, 15”,
12”), and one high frequency horn driver (4” diaphragm,
2” throat). Each driver is contained in a separate vented

AC POWER

enclosure. This integrated design improves performance,
durability, and reliability, eliminates amplifier racks, and
simplifies setup and installation. The MTS-4A has the
following acoustical specifications:

Frequency Response ±3 dB 30 Hz – 16 kHz
Phase Response ±70° 90 Hz – 17.2 kHz
Coverage 70° H x 60° V
Dynamic Range >110 dB

See 12 for complete specifications.

The MTS-4A can be equipped to operate with the Remote

Monitoring System (RMS)

application.

1

interface network and software

When AC power is applied to the MTS-4A, the Intelligent AC™
supply automatically selects the correct operating voltage,
allowing the MTS-4A to be used in the US, Europe, or Japan
without manually setting a voltage switch. The Intelligent AC
power supply also performs surge suppression for high voltage
transients (up to 275 V), minimizes inrush current, and filters
EMI. Continuous voltages above 275 VAC may damage the
unit! The MTS-4A uses a NEMA L6-20P or IEC 309 male power
inlet and satisfies UL, CSA, and EC safety standards.

VOLTAGE REQUIREMENTS

The MTS-4A operates safely and without audio discontinuity if
the AC voltage stays within the ranges 85–134 V or 165–264
V, at 50 or 60 Hz. Immediately after applying AC power, the
green Active LED on the user panel illuminates and the proper
operating voltage is automatically selected, but the system is
muted. During the next three seconds, the primary fan turns
on, the main power supply slowly ramps on, and the system is
enabled to pass audio signals.

NOTE: If the Active LED does not illuminate or the system

does not respond to audio input after ten seconds,
remove AC power to avoid possible damage to the unit.
Experienced electronics technicians with access to a
test bench can verify proper operation for the power
supply and amplifier system with The Meyer Sound
Self-Powered Series MP-2 and MP-4 Field Verification
Procedure (part # 17.022.066.01; contact Meyer Sound
to receive this document). All other users should
contact Meyer Sound or an authorized Meyer service
center.

If the voltage decreases below the lower bound of either
operating range (known as a brown-out period), the supply
uses current from its storage circuits and continues to
function briefly. The unit turns off if the voltage does not
increase above the threshold before the storage circuits are
depleted. The length of time that the MTS-4A 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 MTS-4A 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 MTS-4A does not turn back on after ten seconds, remove
AC power and refer to the Note above.

NOTE: We recommend that the power supply be operated

at least a few volts away from the upper and lower
bounds of the operating windows to avoid brown-out
and possible shutdown.

CURRENT REQUIREMENTS

The MTS-4A 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

1. RMS displays signal and power levels, driver and cooling fan status,
limiter activity, and amplifier temperature for all speakers in the
network on a Windows-based PC. Contact Meyer Sound for more
information about RMS.

4

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

Vpkdrop = Ipk x Rtotal cable

Use the table below as a guide to select cables and circuit
breakers with appropriate ratings for your operating voltage.

V511V032V001

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

Pay close attention to these important electrical and safety
issues.

Use a power cord adapter to drive the MTS-4A

from a standard 3-prong outlet (NEMA 5-15R; 125
V max).

blue =
neutral

yellow/green =
earth ground
(chassis)

brown = hot

SMRsuounitnoC.xaMA14 A7A16

SMRtsruB.xaMA26 A31A30

tsruBgniruDkaePx.aMA83A18 A42

The minimum electrical service amperage required by a system
of Meyer speakers is the sum of their maximum continuous
RMS currents. We recommend allowing an additional 30%
above the minimum amperage to prevent peak voltage drops
at the service entry.

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

Use the following AC cable wiring diagram to create
international or special-purpose power connectors:

earth
ground

chassis
ground

The MTS-4A requires a grounded outlet. Always use a

grounding adapter when connecting to ungrounded
outlets.

Do not use a ground-lifting adapter or cut the AC

cable ground pin.

Keep all liquids away from the MTS-4A 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.

AC cable color code

5