OPERATING INSTRUCTIONS
500-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
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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: 500-HP
Product Options: All
Conforms to the following Product Specifications
Safety: IEC 60065: 2005
EN 60065: 2002
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 (LVD) 2006/95/EC and the EMC Directive 2004/
108/EC.
Office of Quality Manager
Berkeley, California USA
February 11, 2009
European Contact: Your local Meyer Sound dealer or Meyer Sound
Germany, GmbH. Horresser Berg 4A, 56410 Montabaur, Germany.
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 – 55 Hz (0.010 m peak-
to-peak excursion)
© 2009
Meyer Sound. All rights reserved.
500-HP 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.
Compass, Intelligent AC, MAPP Online Pro, RMS, UltraSeries, QuietCool, and all alpha-numeric designations for Meyer Sound products
and accessories are trademarks of Meyer Sound. Galileo, Meyer Sound, QuickFly, 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.
Printed in the USA.
Part Number: 05.187.045.01, Rev. 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
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.
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.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.
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.
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
Introducing the 500-HP Subwoofer 7
Chapter 2: Power Requirements 11
AC Power Distribution 11
The AC Connectors 11
Power Connector Wiring 12
500-HP Voltage Requirements 12
500-HP Current Requirements 13
Electrical Safety Issues 14
Chapter 3: Amplification and Audio 15
Audio Connections with VEAM Cabling 15
Audio Input Modules 15
Amplifier Cooling System 18
Chapter 4: Integrating 500-HP Subwoofers 19
Integrating 500-HP Subwoofers with Meyer Sound Loudspeaker Systems 19
Daisy-Chaining 500-HP Subwoofers with Loudspeakers 20
Driving 500-HP Subwoofers and Loudspeakers with Line Drivers 20
Digital Signal Processors and 500-HP subwoofers 21
The Galileo
®
Loudspeaker Management System 21
Chapter 5: QuickFly® Rigging 23
The MRF-500 Rigging Frame with GuideALinks 23
Groundstacking 500-HPs 24
The MG-M’elodie Grid 25
500-HP with Flown Loudspeakers 27
500-HP Cardioid Arrays 30
The MCF-500 Caster Frame 30
Pole-Mount Receptacle 31
Chapter 6: The RMS Remote Monitoring System 33
The RMS Software 33
The RMS Module 34
Resetting the RMS Module 35
Chapter 7: System Design and Integration Tools 37
MAPP Online Pro 37
The SIM
®
3 Measurement System 38
Appendix A: Optional VEAM Multipin Connector 39
Appendix B: Optional Rain Hood 41
Appendix C: Specifications 43
v
CONTENTS
vi
CHAPTER 1: INTRODUCTION
!
HOW TO USE THIS MANUAL
Make sure to read these operating instructions in their
entirety before configuring a loudspeaker system with
500-HP subwoofers. 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, and
could cause delays or other problems.
Information and specifications are subject to change.
Updates and supplementary information are available on the
Meyer Sound website:
http://www.meyersound.com
INTRODUCING THE 500-HP SUBWOOFER
The 500-HP is a compact, high-output subwoofer that integrates smartly with other Meyer Sound loudspeakers,
enhancing the low-frequency headroom in a variety of fullrange systems. Suitable for both fixed installations and touring applications, the 500-HP is available in two versions:
■ With side panels including handles
■ With QuickFly
®
MRF-500 rigging frames
Meyer Sound Technical Support is available at:
■ Te l: +1 510 486.1166
■ Fax: +1 510 486.8356
■ Email: techsupport@meyersound.com
When outfitted with the optional MRF-500 rigging frame, the
500-HP can be arrayed with other 500-HPs and M’elodie™
curvilinear array loudspeakers, in either flown or groundstacked configurations. The rigging frame also allows the
500-HP to be configured in cardioid arrays. All 500-HP's
come standard with an integral pole-mount receptacle that
7
CHAPTER 1: INTRODUCTION
allows the subwoofer to be easily paired with UltraSeries™
loudspeakers. Also included with all 500-HPs are durable
plastic bottom skids that protect the enclosure and align
with its top slots for secure stacking.
The 500-HP boasts an operating frequency range of 35 Hz
to 140 Hz and a peak SPL of 135 dB. Designed and manufactured at Meyer Sound's Berkeley, California headquarters, the 500-HP's two 12-inch cone drivers are engineered
for extreme efficiency at low frequencies. The high-excursion, low frequency drivers, each with 4-inch voice coils, are
rated for up to 1200 W and housed in a tuned, rectangular
enclosure that has the same width as M'elodie loudspeaker.
The optional MRF-500 rigging frame uses captive, recessed
GuideALinks™, located in the front, center, and rear of the
frame, that allow the subwoofer to be securely arrayed with
other loudspeakers (or safely stowed). A wide range of splay
angles and configurations is achieved with different combinations of front, center, and back positions for the
GuideALinks, which are easily adjusted with convenient,
pinned handles and slots. The rigging frame can be
attached to the MG-M’elodie multipurpose grid and accommodate a variety of flown configurations, including cardioid
arrays. The rigging frame can also be used to suspend
M’elodie arrays (when the 500-HP is attached to the MGM’elodie grid), or they can be used for groundstacking
M’elodies on top of the 500-HP.
The durable 500-HP enclosure is constructed of premium
birch plywood and textured with a black, hard-shell finish. A
hex-stamped, steel grille with acoustical black mesh protects the subwoofer's drivers. Other options include weather
protection and custom color finishes for fixed installations
and other applications with specific cosmetic requirements.
500-HP Rear Panel
The low frequency drivers are driven by a two-channel class
AB/H amplifier with complementary MOSFET output stages.
Ample headroom is delivered with 1800 W of total burst output (900 W per channel). The 500-HP's modular amplifier and
processing electronics are equipped with Meyer Sound's
Intelligent AC™ power supply, which adapts to any power
voltage worldwide and provides soft-turn on and transient
protection. The amplifier, control electronics, and power supply are field-replaceable modules located in the rear of the
enclosure. The optional RMS™ remote monitoring system
allows comprehensive monitoring of system parameters on
Windows
®
-based computers.
8
500-HP OPERATING INSTRUCTIONS
500-HP Groundstacked with M’elodies
MG-M’elodie Grid with 500-HP and M’elodie Array
9
CHAPTER 1: INTRODUCTION
10
CHAPTER 2: POWER REQUIREMENTS
!
Line 1
Line 2 Line 3
Neutral
Earth Ground
!
The 500-HP subwoofer combines advanced loudspeaker
technology with equally advanced power capabilities.
Understanding power distribution, voltage and current
requirements, as well as electrical safety issues, is critical to
the safe operation of the 500-HP.
AC POWER DISTRIBUTION
All components in an audio system (self-powered loudspeakers, mixing consoles, and processors) must be properly connected to an AC power distribution system, ensuring
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.
(nominal) and therefore draws less current than when
using 120 V AC (line-neutral). Make sure that the voltage remains within the 500-HP’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-toground).
THE AC CONNECTORS
The user panel on the back of the 500-HP includes the following PowerCon AC connectors:
500-HP AC Input (left) and AC Loop Output (right) Connectors
The AC Input Connector (Blue)
The blue AC Input connector supplies power to the 500-HP.
The connector is rated at 20 amps and uses a PowerCon3
AC mains locking connector that prevents accidental disconnections. A 10-foot AC power cable, rated at 15 amps, is
included with each 500-HP. If you replace the included AC
power cable, make sure to use a cable with the appropriate
power plug (on the other end) for the region in which you will
operate the unit.
Figure 1: AC Power Distribution System
TIP: Since the 500-HP subwoofer does not
require a dedicated 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
The AC Input connector also supplies power to any additional loudspeakers connected to the 500-HP’s gray Loop
Output connector. Each 500-HP requires approximately
8 A rms maximum at 115 V AC and 4 A rms maximum at
230 V AC for proper operation.
CAUTION: When using the included AC power
cable, do not loop more than one additional
500-HP from the AC Loop Output connector at 115 V
(two total for the circuit), and not more than three at
230 V (four total for the circuit).
11
CHAPTER 2: POWER REQUIREMENTS
!
!
The AC Loop Output Connector (Gray)
The gray AC Loop Output connector allows multiple 500-HP
subwoofers to be looped and powered from a single power
source. Connect the AC Loop Output of the first 500-HP to
the AC Input of the second 500-HP, and so forth. The AC
Loop Output uses a PowerCon3 AC mains locking connector that prevents accidental disconnections.
The maximum number of subwoofers that can be looped
from the Loop Output connector is determined by the voltage of the power source, the current draw of the looped
subwoofers, the circuit breaker rating, and the rating of the
AC power cable connected to the 500-HP.
Table 1: Number of 500-HPs that Can Be Looped with AC Power
Circuit Breaker/
Connector Rating
15 amps 1 looped
20 amps 1 looped
115 V AC 230 V AC 100 V AC
2 total)
(2 total)
3 looped
(4 total)
4 looped
(5 total)
0 looped
(1 total)
1 looped
(2 total)
NOTE: The current draw for the 500-HP is
dynamic and fluctuates as operating levels
change. The numbers in Table 1 assume that operating levels are normal and not such that the subwoofers are constantly limiting.
Each 500-HP ships with one AC looping connector for making AC looping cables. Assembled AC looping cables are
available from Meyer Sound.
CAUTION: Do not exceed the current capabil-
ity of the 20-amp Input connector for the
500-HP. When looping loudspeakers, consider the
total current draw for all loudspeakers on the circuit,
including the first loudspeaker.
AC Connections with VEAM Cabling
The 500-HP can be ordered from the factory with a VEAM allin-one connector. VEAM connectors consolidate AC power,
audio, and RMS into a single cable, facilitating easy connections and quick setups. For more information, see
Appendix A, “Optional VEAM Multipin Connector.”
POWER CONNECTOR WIRING
The 500-HP requires a grounded outlet. To operate safely
and effectively, it is extremely important that the entire system be properly grounded.
AC Cable Color Code
When wiring international or special-purpose power connectors:
■ 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 500-HP 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.
500-HP VOLTAGE REQUIREMENTS
The 500-HP 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 subwoofer allows any combination of voltage
to GND (neutral-line-ground or line-line-ground).
If the voltage drops below 85 V (brownout), the 500-HP uses
stored power to continue operating temporarily; the subwoofer 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.
12
500-HP OPERATING INSTRUCTIONS
!
!
!
CAUTION: The power source for the 500-HP
should always operate within the required voltage range, at least a few volts from the upper and
lower ranges. This will ensure that AC voltage variations from the service entry — or peak voltage drops
due to cable runs — will not cause the loudspeaker’s
amplifiers to cycle on and off or cause damage to the
power supply.
Powering Up the 500-HP
When AC power is applied to the 500-HP, 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 500-HP, 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 power supply ramps up.
4. The green On/Temp LED on the user panel lights up,
indicating the loudspeaker is ready to output audio.
500-HP CURRENT REQUIREMENTS
The current draw for the 500-HP 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. In addition, the
Maximum Long-Term Continuous Current can be used to
calculate the AC looping capability of the 500-HP.
■ 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.
NOTE: The fan remains off at turn-on. It is con-
trolled by audio level and operates only at high
audio levels.
CAUTION: If the On/Temp LED does not light
up, or the 500-HP 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
before resetting the breakers. If necessary, contact
Meyer Sound for repair information.
You can use the following table as a guide for selecting
cable gauges and circuit breaker ratings for the system’s
operating voltage.
500-HP Current Draw
Current Draw 115 V AC 230 V AC 100 V AC
Idle Current 0.49 A rms 0.26 A rms 0.55 A rms
Maximum Long-Term
Continuous Current
Burst Current 18 A rms 9 A rms 21 A rms
Ultimate Short-Term
Peak Current
Inrush Current 10 A peak 13 A peak 10 A peak
8.4 A rms 4.2 A rms 9.7 A rms
40 A peak 22 A peak 46 A peak
The minimum electrical service amperage required by a
500-HP subwoofer 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.
13
CHAPTER 2: POWER REQUIREMENTS
Earth ground
Chassis ground
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.
ELECTRICAL SAFETY ISSUES
Pay close attention to these important electrical and safety
issues.
■ The 500-HP requires a grounded outlet. Always use a
grounded outlet and plug.
■ Use the cable ring on the rear of the 500-HP subwoofer
to reduce strain on the connected AC power and audio
cables. Do not use the cable ring for any other purpose.
■ Keep all liquids away from the 500-HP to avoid hazards
from electrical shock.
■ Do not use a ground-lifting adapter or cut the AC cable
ground pin.
■ Do not exceed the current capability of the 20-amp AC
Input connector for the loudspeaker. When looping loudspeakers, consider the total current draw for all loudspeakers on the circuit, including the first loudspeaker.
■ 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. In addition, the AC power cable must be rated for the total current draw of all loudspeakers looped from the power
source.
■ Do not operate the unit if the power cable is frayed or
broken.
14
CHAPTER 3: AMPLIFICATION AND AUDIO
The low-frequency drivers in the 500-HP are powered by a
two-channel proprietary Meyer Sound amplifier with MOSFET
output stages. The audio signal is processed with an electronic crossover, correction filters for phase and frequency
response, and driver protection circuitry. Each channel has
peak and rms limiters that prevent driver over-excursion and
regulate the temperature of the voice coil.
The user panel on the back of the 500-HP has two slots for
modules. The top slot contains an audio input module
(described in this chapter). The bottom slot is reserved for
the optional RMS module, used for connecting to the RMS
remote monitoring system (see Chapter 6, “The RMS
Remote Monitoring System”).
AUDIO CONNECTIONS WITH VEAM CABLING
The 500-HP can be ordered from the factory with a VEAM allin-one connector. VEAM connectors consolidate AC power,
audio, and RMS into a single cable, facilitating easy connections and quick setups. For more information, see
Appendix A, “Optional VEAM Multipin Connector.”
AUDIO INPUT MODULES
The 500-HP can be equipped with one of the following
audio input modules:
Module Included Features
Looping Audio
Input
Looping, Polarity,
and Attenuating
Audio Input
Summing Audio
Input
These audio input modules are documented in greater detail
in the following sections.
Input and looping connectors, LEDs for limiting
and temperature
Input and looping connectors, LEDs for limiting
and temperature, polarity switch, attenuating
knob (–18 dB)
Summed input connectors (2), LEDs for limiting
and temperature, polarity switch, attenuating
knob (–18 dB)
The Looping Audio Input Module
The Looping Audio Input module includes the following connectors and LEDs.
Looping Audio Input Module
Input Connector
The female XLR Input connector accepts a balanced audio
signal with an input impedance of 10 kOhm. The connector
uses the following wiring:
■ Pin 1 — 220 kOhm 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. Pin 1 is
connected to earth through a 220 kOhm, 1000 pF, 15 V
clamped network. This circuitry provides virtual ground lift
for audio frequencies while allowing unwanted signals to
bleed to ground. Make sure to use standard, balanced XLR
audio cables with all three pins connected on both ends.
Telescopic grounding is not recommended, and shorting an
input connector pin to the case may cause a ground loop,
resulting in hum.
TIP: If unwanted noise or hiss is produced by
the loudspeaker, disconnect its input cable. If
the noise stops, there is most likely nothing wrong
with the loudspeaker. To locate the source of the
noise, check the audio cable, source audio, and AC
power.
15
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