OPERATING INSTRUCTIONS
Acheron® Screen Channel Loudspeakers
Acheron 100, Acheron 80, and Acheron LF
Keep these important operating instructions.
Check www.meyersound.com for updates.
DECLARATION OF CONFORMITY ACCORDING TO ISO/IEC GUIDE 22 AND EN 45014
Manufacturer’s Name: Meyer Sound Laboratories Inc.
Manufacturer’s Address: 2832 San Pablo Avenue
Berkeley, CA 94702-2204, USA
Declares that the product:
Product Names: Acheron 80 Screen Channel Loudspeaker System
Acheron 100 Screen Channel Loudspeaker System
Acheron LF Screen Channel Loudspeaker System
Product Options: All
Conforms to the following Product Specifications:
Safety: EN 60065:2002
EMC: EN55103-1: 1997 emission
EN55103-2: 1997 immunity
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.
Supplementary Information: The product herewith complies with the requirements of the Low Voltage
Directive (LVD) 2006/95/EC and the EMC Directive 2004/108/EC.
Signature:
1
2
Ms. Margie Garza
Director of Quality
Meyer Sound Laboratories Inc.
Berkeley, California 94702 USA
Issued October 27, 2008
European Contact:
Your local Meyer Sound dealer or
Meyer Sound Germany, GmbH.
© 2009, 2010
Meyer Sound. All rights reserved.
Acheron Operating Instructions, PN 05.188.005.01 B
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.
EXP, Intelligent AC, MAPP Online Pro, RMS, QuietCool, and all alpha-numeric designations for Meyer Sound products and accessories are
trademarks of Meyer Sound. Acheron, Compass, Galileo, Meyer Sound, the Meyer Sound wave logo, and SIM 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.
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
Warnung vor gef
elektrischer Spannung
Para indicar voltajes peligrosos Instrucciones importantes de
ährlicher
Important operating instructions Frame or chassis Protective earth ground
Pour indequer important
instructions
Wichtige Betriebsanweisung oder
Gebrauchsanleitung
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.
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 grounding-type
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.
Masse, châssis Terre de protection
Rahmen oder Geh
Armadura o chassis Tierra proteccionista
äuse
Masse Schutzleiter
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.
13.Unplug this loudspeaker during lightning storms or when
unused for long periods of time.
14.Disconnect the mains plug before disconnecting the
power cord from the loudspeaker.
15.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.
CAUTION: To reduce the risk of electric shock,
do not expose this loudspeaker to rain or moisture. Do not install the loudspeaker in wet or humid
locations without using weather protection equipment from Meyer Sound.
iii
SAFETY SUMMARY
English
To reduce the risk of electric shock, dis-
connect 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 user-serviceable 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 celuici.
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-Schnittstellensignalkabel angeschlossen wird. Das Netzkabel erst
nach Herstellung aller Signalverbindungen wieder einstecken.
Der Lautsprecher 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.
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 eléc-
trica, 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 tomacorri-
ente 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 sobrecalen-
tamiento, 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
Chapter 1: Introduction 7
How to Use This Manual 7
Acheron Screen Channel Loudspeaker 7
Chapter 2: Power Requirements 11
AC Connector 11
AC Power Distribution 12
Acheron Voltage Requirements 12
Acheron Current Requirements 12
Powering Up the Acheron 13
Electrical Safety Guidelines 13
Chapter 3: Amplification and Audio 15
Audio Connectors 15
Limiting 16
Amplifier Cooling System 17
Chapter 4: Integrating Acheron LF Loudspeakers 19
Integrating Acheron LF Loudspeakers 19
Galileo Loudspeaker Management System 20
Using Digital Signal Processors and Crossovers with Acheron Systems 20
Chapter 5: Mounting 21
Acheron Floor Mount Brackets 21
Acheron Stacking Bracket 24
Chapter 6: The RMS Remote Monitoring System 29
RMS Software 29
RMS Module 30
Resetting the RMS Module 31
Chapter 7: System Design and Integration Tools 33
MAPP Online Cinema 33
SIM 3 Measurement System 34
Appendix A: Acheron 80 and Acheron 100 Specifications 35
Appendix B: Acheron LF Specifications 39
v
CONTENTS
vi
CHAPTER 1: INTRODUCTION
!
HOW TO USE THIS MANUAL
Make sure to read these operating instructions in their
®
entirety before configuring a system with Acheron
speakers. In particular, pay close attention to material
related to safety issues.
As you read these operating instructions, you will encounter
the following icons for notes, tips, and cautions:
NOTE: A note identifies an important or useful
piece of information relating to the topic under
discussion.
TIP: A tip offers a helpful tip relevant to the topic
at hand.
CAUTION: A caution gives notice that an
action may have serious consequences and
could cause harm to equipment or personnel, or
could cause delays or other problems.
Information and specifications are subject to change.
Updates and supplementary information are available at
www.meyersound.com
.
loud-
ACHERON SCREEN CHANNEL LOUDSPEAKER
At the heart of Meyer Sound's EXP line of cinema products
is the Acheron high-performance screen channel loudspeaker. Optimized for installation behind perforated
screens, the two-way loudspeaker combines the advantages of self-powered technology and innovative horn
design to deliver exceptional, precise coverage for the left,
right, and center sound channels for cinema.
Meyer Sound Technical Support is available at:
■ Te l: +1 510 486.1166
■ Te l: +1 510 486.0657 (after hours support)
■ Web: www.meyersound.com/support
■ Email: techsupport@meyersound.com
Acheron 100 Screen Channel Loudspeaker
The Acheron loudspeaker is available in two full-range models: the Acheron 100, with a 100-degree horizontal by 50degree vertical horn, which is ideal for wide theatres; and
the Acheron 80, with an 80-degree horizontal by 50-degree
vertical horn, which is suitable for narrow theatres and rerecording, production, and post-production facilities.
The Acheron horn (patent pending) was specifically
designed for cinema use and features a very soft roll-off outside the extremely well behaved coverage angle. The horn is
fixed within the enclosure to ensure an accurate acoustic
crossover, phase response, and an incredibly consistent
vertical pattern between the low and high frequencies. The
Acheron’s 580 Hz crossover point places most of the dialog
in the horn, which is ideal for cinema applications.
7
CHAPTER 1: INTRODUCTION
Boasting a frequency response of 38 Hz to 17 kHz at ±4 dB,
as well as a generous peak output of 139 dB at 1 meter with
very low distortion, the Acheron stands up to the most
demanding of digital soundtracks, maintaining a wide
dynamic range and full fidelity. Designed and manufactured
at Meyer Sound's headquarters in Berkeley, California, the
Acheron's drivers include one 15-inch low-frequency neodymium magnet cone driver and one high-frequency 4-inch
diaphragm compression driver. The drivers yield uncompromising quality and full bandwidth, making the Acheron suitable for small and medium theatres, re-recording stages,
and production and post-production facilities. When pairing
an Acheron with an Acheron LF, the system offers enough
headroom for large theatres.
Strategically placed 3/8-inch threaded points on the side
corners of the Acheron cabinet allow the unit to be secured
to floors with uptilt or downtilt using the optional mounting
brackets. The Acheron can also be mounted on top of the
Acheron LF loudspeaker, with uptilt or downtilt, using the
optional stacking brackets. Both brackets are available for
purchase from Meyer Sound.
Acheron 80 Screen Channel Loudspeaker
The Acheron's sophisticated onboard amplification produces consistent and predictable results in any system
design. The proprietary Meyer Sound power amplifier is a
two-channel, class AB/H amplifier with complementary
MOSFET output stages that yields a total output of 1685 W
(3370 W peak). Built-in signal processing includes an electronic crossover and correction filters — to achieve a flat
phase and frequency response — along with driver protection circuitry. The self-powered design not only ensures consistent results but also simplifies installation in both new and
existing rooms.
The optional RMS™ remote monitoring system allows comprehensive monitoring of system parameters on a Windows
®
based computer.
Acheron 100 with Optional Floor Mount Brackets, Front View
Acheron 100 with Optional Floor Mount Brackets, Rear View
-
8
ACHERON OPERATING INSTRUCTIONS
Acheron LF Loudspeaker
The Acheron LF loudspeaker can be paired with the
Acheron 80 or Acheron 100 screen channel loudspeaker to
deliver the low-frequency headroom required by larger theatres. The self-powered Acheron LF with dual 15-inch drivers boosts the headroom on the LCR channels by
converting each Acheron loudspeaker to a system with
three low-frequency drivers in an aligned column.
The Acheron LF is powered by an onboard two-channel
class AB/H amplifier with complementary MOSFET output
stages. Total output power is 2250 W (4500 W peak) and
provides the system with enough headroom to easily
accommodate the extreme demands of digital soundtracks.
The optional RMS remote monitoring system allows comprehensive monitoring of system parameters on a Windowsbased computer.
Acheron LF Screen Channel Loudspeaker
The unique multi-way, gradated design offers smooth coverage and maximum low-frequency impact with all drivers
active at the lowest frequencies and each rolling off, one at a
time, via the integral active crossover. This technique eliminates interference between drivers that would otherwise
occur at shorter wavelengths, enabling the system to maintain ideal polar, phase, and frequency responses throughout
the low and low-mid operating ranges. As a result, the system can deliver the necessary power to completely fill a
large theatre with rich, clean sound, thereby ensuring that
the full intensity and nuance so carefully crafted into today’s
movie soundtracks reach every listener without compromise.
The Acheron LF was designed exclusively for use with
Acheron loudspeakers. The Acheron LF's 37 Hz to 370 Hz
operating frequency range and 136 dB maximum peak SPL
(at 1 meter) were carefully chosen to compliment the
Acheron. The Acheron LF also features the same highpower 15-inch cone driver used in the low frequency section
of the Acheron. Engineered to deliver optimum performance,
the high-excursion, back-vented drivers include 4-inch
voice coils and are housed in a tuned, vented enclosure that
shares the same rectangular footprint as the Acheron.
Acheron LF with Acheron 80
Strategically placed 3/8-inch threaded points on the side
corners of the Acheron LF cabinet allow the unit to be
secured to floors with the optional mounting brackets. An
Acheron can be mounted on top of the Acheron LF with
uptilt or downtilt using the optional stacking brackets.
9
CHAPTER 1: INTRODUCTION
10
CHAPTER 2: POWER REQUIREMENTS
Ground
(green/yellow)
Neutral
(blue)
Line (brown)
Ground
(green/yellow)
X-neutral
(blue)
Y-li ne (b row n)
Blue = neutral
Brown = hot
Yell ow /gr e en =
earth ground
(chassis
!
The Acheron loudspeaker combines advanced loudspeaker
technology with equally advanced power capabilities.
Understanding power distribution, voltage and current
requirements, and electrical safety guidelines is critical to
the safe operation of the Acheron.
AC CONNECTOR
The Acheron AC connector supplies AC power to the unit
and is located on its rear user panel. The Acheron can be
equipped with one of the following AC connectors:
■ IEC 309 male inlet connector.
AC Power Cable with Edison Adapter
The Acheron can be powered from a standard three-prong
Edison outlet with an L6-20 to Edison adapter (available for
purchase from Meyer Sound; PN 27.033.024.03).
L6-20 to Edison AC Power Cable Adapter
AC Connector Wiring
When wiring international or special-purpose AC power
cables and connectors, use the following wiring scheme:
■ NEMA L6-20 (twistlock) male inlet
The Acheron requires a grounded outlet. To operate safely
and effectively, it is extremely important that the entire system be properly grounded.
If you replace the included AC power cable, make sure to
use a cable that is wired correctly and equipped with the
with the appropriate power plug (on the other end) for the
area in which you will operate the unit.
AC Cable Wiring Scheme
■ Connect the blue wire to the black terminal, or the termi-
nal marked with an N.
■ Connect the brown wire to the red terminal, or the termi-
nal marked with an L.
■ Connect the yellow and green wire to the green (or green
and yellow) terminal, or the terminal marked with an E.
CAUTION: When creating AC power cables
and distribution systems, it is important to preserve AC line polarity and connect the earth ground
on both ends of the cable. The Acheron requires a
grounded connection. Always use a grounded outlet
and plug. It is extremely important that the system be
properly grounded to operate safely and properly. Do
not ground-lift the AC cable.
11
CHAPTER 2: POWER REQUIREMENTS
!
Line 1
Line 2 Line 3
Neutral
Earth Ground
!
AC POWER DISTRIBUTION
All components in an audio system (self-powered loudspeakers, processors, etc.) must be properly connected to
an AC power distribution system, to ensure that AC line
polarity is preserved and that all grounding points are connected to a single node or common point using the same
cable gauge as the neutral and line cables.
NOTE: Improper grounding of connections
between loudspeakers and the rest of the
audio system may produce noise or hum, or cause
serious damage to the input and output stages of the
system’s electronic components.
CAUTION: Before applying AC power to any
Meyer Sound self-powered loudspeaker, make
sure that the voltage potential difference between the
neutral and earth-ground lines is less than 5 V AC.
Figure 1 illustrates a basic three-phase AC distribution system with the loudspeaker load distributed across the three
phases. All loudspeakers are connected to common neutral
and earth-ground lines.
ACHERON VOLTAGE REQUIREMENTS
The Acheron operates safely and continuously when the AC
voltage stays within 85–134 V AC and 165–264 V AC at 50
or 60 Hz. The loudspeaker allows any combination of voltage to GND (neutral-line-ground or line-line-ground).
If the voltage drops below 85 V (brownout), the Acheron
uses stored power to continue operating temporarily; the
loudspeaker will shut down if the voltage does not rise
above the low boundary before the stored power is used.
If the voltage rises above 275 V, the power supply could
become damaged.
CAUTION: The power source for the Acheron
should always operate within the required voltage range, at least a few volts from the upper and
lower ranges. This ensures that AC voltage variations
from the service entry — or peak voltage drops due
to cable runs — will not cause the loudspeaker’s
amplifier to cycle on and off or cause damage to the
power supply.
TIP: Since the Acheron does not require a dedi-
cated neutral line, and it can tolerate elevated
voltages from the ground line, it can be connected to
line-line terminals in 120 V, 3-phase Wye systems.
This results in 208 V AC between lines (nominal) and
therefore draws less current than when using 120 V
AC (line-neutral). Make sure that the voltage remains
within the Acheron’s recommended operating windows (85–134 V AC and 165–264 V AC). The ground
line must always be used for safety reasons and the
line-to-ground voltage should never exceed 250 V AC
(typically 120 V AC from line-to-ground).
Figure 1: AC Power Distribution System
12
ACHERON CURRENT REQUIREMENTS
The current draw for the Acheron is dynamic and fluctuates
as operating levels change. Since different cables and circuit breakers heat up at varying rates, it is important to
understand the following types of current ratings and how
they affect circuit breaker and cable specifications.
■ Idle Current — The maximum rms current during idle
periods.
■ Maximum Long-Term Continuous Current — The
maximum rms current during a period of at least 10 seconds. The Maximum Long-Term Continuous Current is
used to calculate temperature increases for cables, to
ensure that cable sizes and gauges conform to electrical
code standards. The current rating is also used as a rating for slow-reacting thermal breakers.
ACHERON OPERATING INSTRUCTIONS
!
!
Earth ground
Chassis ground
■ Burst Current — The maximum rms current during a
period of around one second. The Burst Current is used
as a rating for magnetic breakers. It is also used for calculating the peak voltage drop in long AC cable runs
according to the following formula:
V pk (drop) = I pk x R (cable total)
■ Ultimate Short-Term Peak Current — A rating for fast-
reacting magnetic breakers.
■ Inrush Current — The spike of initial current encoun-
tered when powering on.
You can use Table 1 and Table 2 as guidelines for selecting
cable gauges and circuit breaker ratings for the system’s
operating voltage.
Table 1: Acheron 100 and Acheron 80 Current Draw
Current Draw 115 V AC 230 V AC 100 V AC
Idle Current 0.71 A rms 0.38 A rms 0.79 A rms
Maximum Long-Term
Continuous Current
Burst Current 6.4 A rms 3.2 A rms 7.2 A rms
Ultimate Short-Term
Peak Current
Inrush Current 7 A peak 7 A peak 10 A peak
Table 2: Acheron LF Current Draw
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
Maximum Long-Term
Continuous Current
Burst Current 19 A rms 9.5 A rms 22 A rms
Ultimate Short-Term
Peak Current
Inrush Current 7 A peak 7 A peak 10 A peak
5.8 A rms 2.8 A rms 6.3 A rms
26 A peak 14 A peak 28 A peak
8.8 A rms 4.4 A rms 10.0 A rms
39 A peak 20 A peak 45 A peak
The minimum electrical service amperage required by an
Acheron loudspeaker system is the sum of the Maximum
Long-Term Continuous Current for each loudspeaker. An
additional 30 percent above the minimum amperage is recommended to prevent peak voltage drops at the service
entry.
POWERING UP THE ACHERON
When AC power is applied to the Acheron its Intelligent AC™
power supply automatically selects the correct operating
voltage, allowing it to be used internationally without manually setting voltage switches. In addition, Intelligent AC suppresses high-voltage transients up to several kilovolts, filters
common mode and differential mode radio frequencies
(EMI), and sustains operation temporarily during low-voltage
periods.
When powering up the Acheron, the following startup events
take place over several seconds.
1. Audio output is muted.
2. Voltage is detected and the power supply mode is automatically adjusted as necessary.
3. The primary ultra low-noise fan turns on.
4. The power supply ramps up.
5. The green Active LED on the user panel lights up, indicating the loudspeaker is ready to output audio.
CAUTION: If the Active LED does not light up,
or the Acheron does not output audio after ten
seconds, remove AC power immediately and verify
that the voltage is within the required range. If the
problem persists, contact Meyer Sound Technical
Support.
CAUTION: If either of the loudspeaker’s circuit
breakers trip (the white center buttons disengage), make sure to disconnect the AC power cable
and wait one minute, to allow the stored power to
dissipate, before resetting the breakers. If necessary,
contact Meyer Sound for repair information.
ELECTRICAL SAFETY GUIDELINES
Pay close attention to these important electrical and safety
guidelines.
■ The Acheron requires a grounded outlet. Always use a
grounded outlet and plug.
NOTE: For best performance, the AC cable
voltage drop should not exceed 10 V, or
10 percent at 115 V and 5 percent at 230 V. Make
sure that even with AC voltage drops that the AC
voltage always remains within the operating windows.
13
CHAPTER 2: POWER REQUIREMENTS
■ Make sure the AC power cable for the loudspeaker has
the appropriate power plug (on the other end) for the
area in which you will operate the loudspeaker.
■ Do not operate the unit if the power cable is frayed or
broken.
■ Keep all liquids away from the Acheron to avoid hazards
from electrical shock.
14
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