Meyer Sound 600-HP User Manual

OPERATING INSTRUCTIONS CONCERT SERIES

600-HP Compact High-Power Subwoofer

Keep these important operating instructions.

Check www.meyersound.com for updates.

DECLARATION OF CONFORMITY ACCORDING TO ISO/IEC GUIDE 22 AND EN 45014

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

Made by Meyer Sound Laboratories
Berkeley, California USA

Manufacturer’s Name:

Meyer Sound Laboratories Inc.

Manufacturer’s Address:

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

Declares that the products

Product Name: 600-HP
Product Options: All

Conforms to the following Product Specifications
Safety: IEC 60065: 2002
BS EN 60065: 2002
CSA C22.2 60065: 2003
UL 813: 1999
EMC: EN 55103-1: 1997 emission(1)
EN 55103-2: 1997 immunity(2)

This device 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.

Supplementary Information

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
April 15, 2006

European Contact: Your local Meyer Sound dealer or Meyer Sound
Germany, GmbH. Carl Zeiss Strasse 13, 56751 Polch, Germany.
Telephone: [phone] Fax: [phone]

Environmental specifications for Meyer Sound Electronics
products

Operating Temperature 0˚ C to +45˚ C
Non operating Temperature <-40˚ C or > +75˚ C
Humidity to 95% at 35˚ C
Operating Altitude to 4600 m (15,000 ft)
Non operating Altitude to 6300 m (25,000 ft)
Shock 30 g 11 msec half-sine on

each of 6 sides

Vibration 10 Hz to 55 Hz (0.010 m peak-

to-peak excursion)

© 2006 Meyer Sound. All rights reserved.
600-HP Compact High-Power Subwoofer Operating Instructions

The contents of this manual are furnished for informational purposes only, are subject to change without notice, and should not be construed as a
commitment by Meyer Sound Laboratories Inc. Meyer Sound assumes no responsibility or liability for any errors or inaccuracies that may appear
in this manual. Except as permitted by applicable copyright law, no part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form or by any means, electronic, mechanical, recording or otherwise, without prior written permission from Meyer Sound.

600-HP, MICA, Intelligent AC, RMS, Galileo, Compass, MAPP Online Pro, GuideALink, and all alpha-numeric designations for Meyer Sound
products and accessories are trademarks of Meyer Sound. Meyer Sound, TruPower, SIM and QuickFly are registered trademarks of Meyer Sound
Laboratories Inc. (Reg. U.S. Pat. & Tm. Off.). All third-party trademarks mentioned herein are the property of their respective trademark holders.

Printed in the U.S.A.

Part Number: 05.149.005.01 A

ii

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 voltajes

peligrosos.

Important operating

instructions

Pour indequer important

instructions

Zu wichtige betriebs-

anweisung und unter-

haltsanweisung zeigen

Instrucciones importantes

de funcionamiento y/o

manteniento

IMPORTANT SAFETY INSTRUCTIONS

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this loudspeaker near water.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in ac­cordance with Meyer Sound’s installation instructions.

Frame or chassis Protective earth ground

Masse, châssis Terre de protection

Rahmen oder chassis Die schutzerde

Armadura o chassis Tierra proteccionista

11. Only use attachments/accessories specified by Meyer
Sound.

12. Use only with the caster rails or rigging specified by
Meyer Sound, or sold with the loudspeaker. Handles
are for carrying only.

CAUTION: Rigging should only be done by

experienced professionals.

8. Do not install near any heat sources such as radiators,
heat registers, stoves, or other apparatus that produce
heat.

9. Do not defeat the safety purpose of the grounding­type plug. A grounding-type plug has two blades and
a third grounding prong. The third prong is provided
for your safety. If the provided plug does not fit into
your outlet, consult an electrician for replacement of
the obsolete outlet.

10. Protect the power cord from being walked on or
pinched, particularly at plugs, convenience recep­tacles, and the point where they exit from the loud­speaker. The AC mains plug or appliance coupler shall
remain readily accessible for operation.

13. Unplug this loudspeaker during lightning storms or
when unused for long periods of time.

14. Refer all servicing to qualified service personnel.
Servicing is required when the loudspeaker has been
damaged in any way, such as when the power-supply
cord or plug has been damaged; liquid has been
spilled or objects have fallen into the loudspeaker;
rain or moisture has entered the loudspeaker;
the loudspeaker has been dropped; or when, for
undetermined reasons, the loudspeaker does not
operate normally.

iii

SAFETY SUMMARY

English

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

- Connect the loudspeaker 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 install the loudspeaker
in wet or humid locations
without using weather protection
equipment from Meyer Sound.

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

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

- This loudspeaker contains
potentially hazardous voltages. Do
not attempt to disassemble the
unit. The unit contains no user­serviceable parts. Repairs should
be performed only by factory­trained service personnel.

Français

- Pour réduire le risque
d’électrocution, débrancher
la prise principale de l’haut­parleur, 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 l’haut-parleur 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 installer l’haut-parleur dans
un endroit où il y a de l’eau ou une
humidité excessive.

- Ne pas laisser de l’eau ou tout
objet pénétrer dans l’haut-parleur.
Ne pas placer de r´cipients
contenant un liquide sur cet
appareil, ni à proximité de celui-ci.

- Pour éviter une surchauffe de
l’haut-parleur, 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 haut-parleur 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.

Deutsch

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

- Der Lautsprecher an eine
geerdete zweipolige Dreiphasen­Netzsteckdose 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.

- Der Lautsprecher nicht an einem
Ort aufstellen, an dem sie mit
Wasser oder übermäßig hoher
Luftfeuchtigkeit in Berührung
kommen könnte.

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

- Um ein Überhitzen dem
Lautsprecher 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 Lautsprecher
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.

Español

- Para reducir el riesgo de descarga
eléctrica, desconecte de la red
de voltaje el altoparlante antes de
instalar el cable de señal de audio.
Vuelva a conectar la alimentacion
de voltaje una vez efectuadas
todas las interconexiones de
señalizacion de audio.

- Conecte el altoparlante 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 instale el altoparlante en
lugares donde haya agua o
humedad excesiva.

- No deje que en el altoparlante
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 altoparlante 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.

iv

CONTENTS

INTRODUCTION 1

CHAPTER 1: Introducing the 600-HP Compact High-Power Subwoofer 3

CHAPTER 2: Power Requirements 5

CHAPTER 3: Amplification and Audio 9

How to Use this Manual 1

High Power and High Performance 3
Versatile Configuring and Rigging 3
Features & Benefits 4
Applications 4

AC Power 5
Voltage Requirements 5
AC Power Distribution 5
Current Requirements 6
Power Connector Wiring Conventions 7
Electrical Safety Issues 8

Audio Input 9
600-HP Interconnections 10
Cabling 10
600-HP Limiting 10
600-HP Amplifier Cooling System 11

CHAPTER 4: RMS™ Remote Monitoring System (Optional) 13

Understanding the RMS Communication Module’s User Panel 13

Service LED (Red) 13
Service Button 14
Wink LED (green) 14
Reset Button 14
Activity LED (Green) 14

User Interface 14

CHAPTER 5: System Integration 15

Using 600-HP Subwoofers with Other Meyer Sound loudspeakers 15

Subwoofer Placement 15
600-HP Used with MICA™ Curvilinear Array Loudspeakers 15
600-P Used with Concert and UltraSeries Loudspeakers 16
Daisy-Chained 16
Adding an LD-1A/LD-2 Line Driver 16
Using the LD-1A/LD-2’s Lo-Cut Filter 16
Adding an LD-3 Compensating Line Driver 17
Using the Galileo™ 616 Loudspeaker Management System 17
Digital Signal Processors 17

CHAPTER 6: System Design and Integration Tools 19

MAPP Online Pro™ 19
SIM® Measurement System 20

Source Independent Measurement Technique 20
Applications 20

v

CHAPTER 7: QuickFly® Rigging and Ground-stacking 21

Flying the 600-HP Subwoofer 21
GuideALink™ Rigging Frame 21

600-HP to 600-HP 22

Flown 22
Ground-stacked 22

600-HP to MICA 22

Flown 22
Ground-stacked 23

The MG-MICA Multipurpose Grid 24

Flown Configuration 24

Ground-Stacked Configuration 25
The Optional MDTL-MICA Downtilt Link 25
MCF-MICA Caster Frame 25
MDB-600 Dolly Board 27

APPENDIX A: Amplifier Replacement and Optional Rain Hood 29

Using the Rain Hood (Weather-Protected Loudspeakers) 29
Removing the HP-2/600 Amplifier 29

Replacing the HP-2/600 Amplifier 29

APPENDIX B: 600-HP Specifications 31

vi

INTRODUCTION TO THIS MANUAL

INTRODUCTION

These operating instructions provide important information
about the form, features, function, and specifications of
the 600-HP high-power subwoofer. In addition to power re­quirements and audio characteristics, fundamental system
design, useful software tools, and array configurations for
the 600-HP are discussed.

Chapter 1: Introduction provides a general description of
the 600-HP and its capabilities and functionality.

Chapter 2: Power Requirements discusses power
distribution, voltage and current requirements, as well as
electrical safety issues.

Chapter 3: Amplification and Audio will help you under­stand and harness the power of the 600-HP amplifier and
audio systems. Amplifier specifications, connectivity, limit­ing, and cooling system components are all covered.

Chapter 4: RMS™ Remote Monitoring System (Optional)
introduces you to the optional communication RMS module,
which can be installed in the 600-HP’s amplifier to make
use of Meyer Sound’s RMS remote monitoring system.

Chapter 5: System Integration will walk you through the
integration of the 600-HP in mid-high or full-range systems
also discusses the options available for positioning and
ground-stacking the 600-HP subwoofer.

Chapter 6: System Design and Integration Tools
introduces two comprehensive tools, MAPP Online Pro™
and SIM® 3, for assisting you with the acoustical and
functional requirements of system design and optimization.

Chapter 7: QuickFly® Rigging discusses the options
available for suspending and ground-stacking the 600-HP
subwoofer.

Appendix A: Amplifier Replacement and Optional Rain
Hood discusses the procedure for replacing the 600-HP

amplifier and rain hood.

HOW TO USE THIS MANUAL

As you read this manual, you’ll find figures and diagrams
to help you understand and visualize what you’re reading.
You’ll also find numerous icons that serve as cues to flag
important information or warn you against improper or po­tentially harmful activities. These icons include:

A NOTE identifies an important or useful
piece of information relating to the topic

under discussion.

A TIP offers a helpful tip relevant to the topic
at hand.

A CAUTION gives notice that an action can

have serious consequences and could cause
harm to equipment or personnel, delays, or other
problems.

Information and specifications are applicable as of the date
of this printing. Updates and supplementary information are
posted on the Meyer Sound Web site at:

www.meyersound.com

You may contact Meyer Sound Technical Support at:

Tel: [phone]

Fax: [phone]

Email: [e-mail]

Appendix B: Specifications includes a full list of
specifications for the 600-HP, along with dimensional
drawings.

1

INTRODUCTION

2

CHAPTER 1: INTRODUCING THE 600-HP SUBWOOFER

CHAPTER 1

The 600-HP is a self-powered, high-output subwoofer
that may be used in both flown and ground-stacked
configurations. It is designed to rig directly with MICA™
compact high-power curvilinear array loudspeakers when
fitted with the optional QuickFly MRF-600 rigging frame.
The versatility of the 600-HP also allows it to be used with
a variety of other Meyer Sound self-powered loudspeakers
— such as M’elodie, CQ-1, CQ-2, UPA-1P, UPA-2P, and
UPJ-1P — in fixed and touring applications.

Figure 1.1. 600-HP compact high-power subwoofer

VERSATILE CONFIGURING AND RIGGING

The 600-HP is available for fixed installations or portable
applications; all versions include rugged plastic skids on the
bottom of the unit to ensure secure stacking and prevent
damage to the enclosure.

The three available side-panel options are:

■ MRF-600 rigging frame

■ Panels with handles

■ Blank panels with no handles

HIGH POWER AND HIGH PERFORMANCE

The system features two specially designed high-power
15-inch cone drivers, engineered to provide optimal per­formance in subwoofer applications. The high-excursion,
back-vented drivers have 4-inch voice coils, and each is
rated to handle 1200 watts (AES*). Each cone driver is
driven by a channel of the integral two-channel class AB/H
amplifier with complementary MOSFET output stages.

Total output power is 2250 watts (4500 watts peak), and
the operating frequency range is from 36 Hz to 150 Hz,
with a peak SPL of 138 dB. An amplifier with integral signal
processing and driver protection is integrated into a field­replaceable module mounted in the rear of the enclosure.

The RMS remote monitoring system — standard with
the rigging version and optional on other configurations
— allows comprehensive monitoring of system parameters
on a Windows®-based network.

*Power handling is measured under AES standard condi­tions: transducer driven continuously for two hours with
band-limited noise signal having a 6 dB peak-average ratio.

Figure 1.2. Side-panel options

When fitted with the optional QuickFly MRF-600 rigging
frame, the 600-HP is designed to rig directly with the MICA
compact, high-power curvilinear array loudspeakers.

The optional MRF-600 rigging frame uses captive, rigid
GuideALinks™. A slot and convenient pinned handle allow
the links to be moved and pinned for arraying or storage.
The 600-HP can make use of the optional MG-MICA rigging
grid for flown and stacked configurations.

3

CHAPTER 1

Figure 1.3. Flown array with MICA loudspeakers and 600-HP subwoofers

Figure 1.4. Ground-stack with MICA loudspeakers and 600-HP subwoofers

The 600-HP can securely travel in stacks using the MCF­MICA when fitted with MRF-600 frames or using the MDB­600 dolly board. The dimensions of the 600-HP are suitable
for both European and U.S. trucks

Other options for the 600-HP include weather protection
and custom color finishes for fixed installations and other
applications requiring specific cosmetics.

Figure 1.5. In transport on MCF-MICA caster frame

FEATURES & BENEFITS

■ Efficient, high-power, high-excursion cone drivers

■ Extremely low distortion for low-frequency clarity

■ Very high peak power yields excellent transient

reproduction

■ Stackable, and flyable by itself or with MICA full-range
loudspeakers

■ Compatible with MG-MICA rigging frame for flying and
ground-stacking

■ Transportable in stacks using optional MCF-MICA
caster frame or MDB-600 dolly board

■ Low-frequency complement to MICA and other Meyer
Sound self-powered loudspeakers

APPLICATIONS

■ Medium to large theatres and clubs

■ Houses of worship

■ Portable and installed A/V systems

4

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 

 

CHAPTER 2: POWER REQUIREMENTS

CHAPTER 2

Self-powered and highly portable, the 600-HP subwoofer
incorporates advanced loudspeaker technology with
equally advanced power capabilities. Understanding the
600-HP subwoofer’s power distribution, voltage and cur­rent requirements, as well as electrical safety issues, is
critical to the safe and correct operation and deployment
of the 600-HP subwoofer.

AC POWER

When AC power is applied to the 600-HP subwoofer, the
Intelligent AC™ power supply automatically selects the
cor-rect operating voltage, allowing the 600-HP subwoofer
to be used internationally without manually setting voltage
switches. The Intelligent AC power 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 differential mode radio
frequencies (EMI)

■ Sustains operation temporarily during low-voltage
periods

■ Provides soft-start power-up, eliminating high inrush
current

to operating the subwoofer from 120 V AC
(Line-Neutral). Make sure that the voltage remains
within the 600-HP subwoofer’s recommended
operating window (180 V AC to 250 V AC). The
Ground terminal must always be used for safety
and the Line to Ground voltage should never
exceed 250 V AC (typically there will be 120 V AC
from Line to Ground in the above example).

The 600-HP subwoofer uses a NEMA L6-20P, an IEC 309
male power connector, a PowerCon connector, or a multi­pin VEAM connector and complies with worldwide product
safety standards.

AC POWER DISTRIBUTION

All amplifier modules and directly associated audio equip­ment (mixing consoles, processors, etc.) must be properly
connected to the AC power distribution, preserving AC
line polarity and connecting earth ground such that all
grounding points are connected to a single node or com­mon point using the same cable gauge as the neutral and
line(s) cable(s).

Improper grounding connections between loudspeakers
and the rest of the audio system may produce noise, hum
and/or serious damage to the input/output stages in the
system’s electronic equipment.

VOLTAGE REQUIREMENTS

The 600-HP subwoofer operates safely and without audio
discontinuity if the AC voltage stays within either of two
operating ranges at 50 or 60 Hz:

■ 85 to 134 volts

■ 165 to 264 volts

The 600-HP subwoofer can withstand continuous voltages
up to 275 volts and allows any combination of voltage to
GND (that is neutral-line-ground or line-line-ground).

CAUTION: Continuous voltages higher than

275 volts can damage the unit.

TIP: Since the 600-HP subwoofer does

not require a dedicated Neutral, and it can
tolerate elevated voltages from ground, it can be
connected between Line-Line terminals in a
120 V 3-phase Wye system. This results in 208 V
AC between lines (nominal) and will therefore draw
less current for the same output power compared

CAUTION: Before applying AC to any

Meyer Sound self-powered loudspeaker, be
sure that the voltage potential difference between
neutral and earth ground is less than 5 V AC.

Figure 2.1 shows a sample three-phase AC distribution
system, with the load between loudspeakers distributed
among the three phases and all of the loudspeakers
connected to common neutral and earth ground points.

Figure 2.1. A sample AC power distribution block diagram

5

CHAPTER 2

NOTE: Refer to Appendix B for details on

the 600-HP’s AC voltage requirements.

After applying AC power, the proper operating voltage is
automatically selected, but the system is muted. During the
next three seconds the following events occur:

CURRENT REQUIREMENTS

The 600-HP subwoofer presents a dynamic load to the AC
mains, which causes the amount of current to fluctuate
between quiet and loud operating levels. Since different
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.

1. The primary fan turns on.

2. The main power supply slowly ramps on.

3. The green Active LED on the user panel lights up,
indicating that the system is enabled and ready to pass
audio signals.

CAUTION: If the Active LED does not il-

luminate or the system does not respond to
audio input after 10 seconds, remove AC power im­mediately. Verify that the voltage is within the proper
range. If the problem persists, please contact Meyer
Sound or an authorized service center.

If voltage drops below the lower boundary of either safe
operating range (brownout), the 600-HP subwoofer uses
stored energy to continue functioning briefly, and shuts
down only if voltage does not rise above the lower bound­ary before the subwoofer’s storage circuits are depleted.
How long the 600-HP subwoofer will continue to function
during brownout depends on the amount of voltage drop
and the audio source level during the drop.

If the voltage increases above the upper boundary of
either range, the power supply rapidly turns off, preventing
damage to the unit.

The maximum long-term continuous current is the maxi­mum rms current during a period of at least 10 seconds.
It is used to calculate the temperature increase in cables
in order to select a cable size and gauge that conforms to
electrical code standards. It is also used to select the rating
for slow-reacting thermal breakers.

The burst current is the maximum rms current during a
period of approximately one second, used to select the
rating of most magnetic breakers and to calculate the peak
voltage drop in long AC cables according to the formula:

V pk (drop) = I pk x R (cable total)

The ultimate short-term peak current is used to select the
rating of fast-reacting magnetic breakers.

Use Table 2.1 below as a guide when selecting cable gauge
size and circuit breaker ratings for your operating voltage.

Table 2.1. Current Ratings for the 600-HP Subwoofer

Current Draw 115 V AC 230 V AC 100 V AC

Idle current 0.64 A rms 0.32 A rms 0.85 A rms

Max. long-term
continuous

Burst current 19 A rms 9.5 A rms 22 A rms

Ultimate short­term peak

8.8 A rms 4.4 A rms 10 A rms

39 A pk 20 A pk 45 A pk

NOTE: If voltage fluctuates within either oper-

ating range, automatic tap selection stabilizes
the internal operating voltage. This tap selection is
instantaneous, and there are no audible artifacts.

If the 600-HP subwoofer shuts down due to either low or
high voltage, its power supply automatically turns on again
after three seconds if the voltage has returned to either nor­mal operating range. If the 600-HP subwoofer does not turn
back on after 10 seconds, remove AC power immediately
(see above Caution).

NOTE: It is recommended that the supply be

operated in the rated voltage ranges at least
a few volts away from the turn on/off points. This
ensures that AC voltage variations from the service
entry — or peak voltage drops due to long cable
runs and/or insufficient gauge cable — do not cause
the amplifier to cycle on and off.

6

NOTE: For best performance, the AC cable

voltage drop should not exceed 10 volts, or
10 percent at 115 volts and 5 percent at 230 volts.
Make sure that even with the AC voltage drop the
AC voltage always stays in the operating windows.

NOTE: The minimum electrical service am-

perage required by the 600-HP subwoofer
system is the sum of each loudspeaker’s maximum
long-term continuous current. An additional 30
percent above the minimum amperage is recom­mended to prevent peak voltage drops at the
service entry.