Meyer Sound MPS-488HP User manual

Keep these important operating instructions.
Check www.meyersound.com for updates.
OPERATING INSTRUCTIONS INDUSTRIAL SERIES
MPS-488HP Power Supply

ii
DECLARATION OF CONFORMITY ACCORDING TO ISO/IEC GUIDE 22 AND EN 45014
© 2011
Meyer Sound. All rights reserved.
MPS-488HP Operating Instructions, PN 05.205.005.01 A
The contents of this manual are furnished for informational purposes only, are subject to change without notice, and should not be con-
strued as a commitment by Meyer Sound Laboratories Inc. Meyer Sound assumes no responsibility or liability for any errors or inaccura-
cies 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 writ-
ten permission from Meyer Sound.
HMS-10, MM-10XP, MM-4XP, UP4-XP, MPS-488HP, and all alpha-numeric designations for Meyer Sound products and accessories are
trademarks of Meyer Sound. Meyer Sound and the Meyer Sound wave logo 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.
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: MPS-488HP Power Supply
Product Options: All
Conforms to the following Product Specifications:
Safety: EN 60065:2002
EMC: EN55103-1: 1997 emission1
EN55103-2: 1997 immunity2
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:
Ms. Margie Garza
Director of Quality
Meyer Sound Laboratories Inc.
Berkeley, California 94702 USA
Issued December 13, 2010
European Contact:
Your local Meyer Sound dealer or
Meyer Sound Germany, GmbH.

iii
SYMBOLS USED
These symbols indicate important safety or operating features in this booklet and on the chassis:
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accor-
dance 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.
11.Only use attachments/accessories specified by Meyer
Sound.
CAUTION: Rigging should only be done by
experienced professionals.
12.Unplug this apparatus during lightning storms or when
unused for long periods of time.
13.Refer all servicing to qualified service personnel. Servic-
ing is required when the apparatus 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 apparatus; rain or moisture has
entered the apparatus; the apparatus has been dropped;
or when for undetermined reasons the apparatus does
not operate normally.
Dangerous voltages: risk of
electric shock
Important operating instructions Frame or chassis Protective earth ground
Pour indiquer les risques
résultant de tensions dangereuses
Pour indequer important
instructions
Masse, châssis Terre de protection
Warnung vor gefährlicher
elektrischer Spannung
Wichtige Betriebsanweisung oder
Gebrauchsanleitung
Rahmen oder Gehäuse Masse Schutzleiter
Para indicar voltajes peligrosos Instrucciones importantes de
funcionamiento y/o manteniento
Armadura o chassis Tierra proteccionista
!
!

iv
SAFETY SUMMARY
English
■To reduce the risk of electric shock, dis-
connect the apparatus from the AC
mains before installing audio cable.
Reconnect the power cord only after
making all signal connections.
■Connect the apparatus 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 apparatus 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 apparatus. Do not put
objects containing liquid on or near the
unit.
■To reduce the risk of overheating the
apparatus, avoid exposing it to direct
sunlight. Do not install the unit near
heat-emitting appliances, such as a
room heater or stove.
■This apparatus contains potentially haz-
ardous voltages. Do not attempt to dis-
assemble the unit. The unit contains no
user-serviceable parts. Repairs should
be performed only by factory-trained
service personnel.
Français
■Pour réduire le risque d’électrocution,
débrancher la prise principale de
l’appareil, avant d’installer le câble
d’interface allant à l’audio. Ne
rebrancher le bloc d’alimentation
qu’après avoir effectué toutes les autres
connections.
■Branchez l’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 ris-
que d’électrocution et peut constituer
une infraction à la réglementation locale
concernant les installations électriques.
■Ne pas installer l’appareil dans un
endroit où il y a de l’eau ou une humid-
ité excessive.
■Ne pas laisser de l’eau ou tout objet
pénétrer dans l’appareil. Ne pas placer
de r´ecipients contenant un liquide sur
cet appareil, ni à proximité de celui-ci.
■Pour éviter une surchauffe de l’appareil,
conserver-le à l’abri du soleil. Ne pas
installer à proximité d’appareils dégag-
eant de la chaleur tels que radiateurs ou
appareils de chauffage.
■Cet 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 répa-
rations doivent être effectuées par du
personnel qualifié et agréé par le con-
structeur.
Deutsch
■Um die Gefahr eines elektrischen
Schlages auf ein Minimum zu
reduzieren, das Gerät vom Stromnetz
trennen bevor ein Audio Schnittstellen-
signalkabel angeschlossen wird. Das
Netzkabel erst nach Herstellung aller
Signalverbindungen wieder einstecken.
■Der Gerät nur an eine geerdete Schuko
Dose 230 V; "CEE 7/4 oder Type F"
anschließen. Die Steckdose muß mit
einem geeigneten Abzweigschutz
(Sicherung oder Leitungsschuitzschal-
ter) verbunden sein. Der Anschluß des
Gerätes an einen anderen Steckdosen-
typ kann zu Stromschlägen führen und
gegen die örtlichen Vorschriften ver-
stoßen.
■Das Gerät nicht an einem Ort aufstellen,
an dem es mit Wasser oder übermäßig
hoher Luftfeuchtigkeit in Berührung
kommen könnte.
■Darauf achten, daß weder Wasser noch
Fremdkörper in das Innere den Gerät
eindringen. Keine Objekte, die Flüs-
sigkeit enthalten, auf oder neben die
unterbrechungsfreie Stromversorgung
stellen.
■Um ein Überhitzen des Geräts zu ver-
hindern, das Gerät vor direkter Sonne-
neinstrahlung schützen und nicht in der
Nähe von wärmeabstrahlenden Geräten
(z.B. Heizgerät) aufstellen.
■Im Inneren dieses Geräts herrschen
potentiell gefährliche Spannungen.
Nicht versuchen, das Gerät zu öffnen.
Es enthält keine vom Benutzer zu rep-
arierende Teile. Reparaturen dürfen nur
von ausgebildetem Kundendienstper-
sonal durchgeführt werden.
Español
■Para reducir el riesgo de descarga eléc-
trica, desconecte de la red de voltaje el
aparato antes de instalar el cable de
señal de audio. Vuelva a conectar la ali-
mentacion de voltaje una vez efectua-
das todas las interconexiones de
señalizacion de audio.
■Conecte el aparato a un tomacorriente
bipolar y trifilar con neutro de puesta a
tierra. El tomacorriente debe estar
conectado a la protección de deri-
vación 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 aparato en lugares donde
haya agua o humedad excesiva.
■No deje que en el aparato entre agua ni
ningún objeto extraño. No ponga obje-
tos 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 calentadores.
■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 efec-
tuarse únicamente por parte del per-
sonal de mantenimiento capacitado en
la fábrica.

v
CONTENTS
Chapter 1: Introduction 7
How to Use This Manual 7
MPS-488HP External Power Supply 7
Chapter 2: MPS-488HP Front and Rear Panels 9
MPS-488HP Front Panel 9
MPS-488HP Rear Panel 10
MPS-488HP Current Draw 13
Safety Issues 13
Chapter 3: Connecting Loudspeakers to the MPS-488HP 15
Appendix A: MPS-488HP Accessories 17
Appendix B: Phoenix and EN3 Cable Assembly 19
Appendix C: MPS-488HP Specifications 25

CONTENTS
vi

7
CHAPTER 1: INTRODUCTION
HOW TO USE THIS MANUAL
Make sure to read these operating instructions in their
entirety before configuring a loudspeaker system with
MPS-488HP power supplies. In particular, pay close atten-
tion 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.
Meyer Sound Technical Support is available at:
■Tel: [phone]
■Tel : [phone] (after hours support)
■Web: www.meyersound.com/support
■Email: [email protected]
MPS-488HP EXTERNAL POWER SUPPLY
The MPS-488HP external power supply delivers DC power
and balanced audio to up to eight Meyer Sound loudspeak-
ers that require an external 48 V DC power supply.
The single-space 19-inch rack MPS-488HP can be used
with the following Meyer Sound loudspeakers:
■MM-4XP miniature loudspeaker
■UP-4XP ultracompact loudspeaker
■HMS-10 surround loudspeaker.
■MM-10XP miniature subwoofer
Powering loudspeakers from an external source eliminates
the need for wiring conduits while still preserving the advan-
tages of self-powered systems. Meyer Sound's externally
powered loudspeakers are equipped with onboard amplifi-
cation and signal-processing circuits that store DC power
and tolerate voltage drops (up to 30 percent), thereby
accommodating light-gauge cables and lengthy cable runs.
The MPS-488HP receives eight channels of balanced audio
from its XLR female Channel Inputs and routes the audio,
along with 48 V of DC power, to its eight Channel Outputs.
Channel Inputs feature toggle switches that route audio to
corresponding outputs only, or to adjacent, contiguous out-
puts. For example, Channel Input 1 can be routed to Chan-
nel Outputs 1 and 2 and Channel Input 3 can be routed to
Channel Outputs 3 and 4. Another example would be to
route Channel Input 1 to Channel Outputs 1–4 and Channel
Input 5 to Channel Outputs 5–8.
The power supply’s eight Channel Outputs are equipped with
sophisticated microprocessor-controlled current limiting that
protects each channel from short circuits and unexpected
voltages. The Channel Outputs are available as either
Phoenix™ 5-pin male connectors on the MPS-488HPp
model, or SwitchCraft®EN3™ 5-pin female connectors on
the MPS-488HPe model. Outputs can deliver DC power to
loudspeakers at cable lengths up to 150 feet or 300 feet
(depending on the loudspeaker model) with just 1 dB of loss
in peak SPL using 18 AWG wire. The use of composite mul-
!
MPS-488HP External Power Supply

CHAPTER 1: INTRODUCTION
8
ticonductor cables (such as Belden®1502 or equivalent)
allows a single cable to carry both audio and DC power from
the MPS-488HP to the loudspeakers. Longer cable lengths
are possible for moderate applications that don't drive the
loudspeakers to maximum output, as well as for installations
with heavier wire gauges.
The MPS-488HP front panel has two LEDs per Channel Out-
put that provide useful feedback on the status of the sys-
tem. The Voltage LEDs indicate when voltage is present for
each Channel Output. The Load Current LEDs indicate when
a loudspeaker is connected to a Channel Output, glow
brighter as the signal level increases, and flash when a short
circuit is encountered.
NOTE: The MPS-488HP external power supply
replaces the MPS-488 model, which was origi-
nally designed for use with MM-4XP loudspeakers.
The MPS-488 is also compatible with the UP-4XP,
HMS-10, and MM-10XP, but can only power a maxi-
mum of four of these loudspeakers; when powering
these loudspeakers with the MPS-488, they should
only be connected to Channel Outputs 1, 3, 5, and 7
(do not use the even-numbered Channel Outputs).
MPS-488HPp Model with Phoenix Output Connectors
MPS-488HPe Model with EN3 Output Connectors

9
CHAPTER 2: MPS-488HP FRONT AND REAR PANELS
MPS-488HP FRONT PANEL
The MPS-488HP front panel includes a power switch and
LEDs for monitoring each loudspeaker channel.
AC Power
The MPS-488HP is powered on and off with the AC Power
switch.
Voltage and Load Current LEDs (1–8)
The Voltage and Load Current LEDs are useful for verifying
whether each Channel Output has voltage and whether the
connected loudspeakers are receiving DC power and audio.
Blue Voltage LEDs (1–8)
The blue Voltage LEDs indicate whether voltage is present
for the Channel Outputs. These LEDs should be lit when the
MPS-488HP is powered on. The MPS-488HP’s intelligent
circuit protection shields connected loudspeakers from
surges and shorts. When a blue Voltage LED is unlit and its
corresponding green Load Current LED is blinking, a surge
or short has been detected for the channel. If a surge or
short is encountered, power down the MPS-488HP and
inspect the loudspeaker cabling for that channel.
Table 1 lists the possible states for the Voltage LEDs.
CAUTION: When a blue Voltage LED is unlit and
its corresponding green Load Current LED is
blinking, indicating a surge or short for the channel,
power down the MPS-488HP and inspect the loud-
speaker cabling for that channel.
MPS-488HP Power Supply Front Panel
MPS-488HP Channel LEDs
Table 1: Voltage LEDs
State Cause Recommended Action
Unlit
(all LEDs)
MPS-488HP not pow-
ered on
Verify the MPS-488HP is
powered on and verify its
power source
Unlit
(single LED)
Surge or short encoun-
tered for channel (corre-
sponding Load Current
LED blinks)
Power down the
MPS-488HP and inspect
the loudspeaker cabling
for the channel
Blinking
(all LEDs)
Internal failure encoun-
tered
Service required
Blinking
(single LED)
Residual voltage
detected for channel
Unplug and plug the
channel’s loudspeaker
cable; if the problem per-
sists, verify the loud-
speaker cabling
Glows
brighter
(single LED)
LED glows brighter as
channel’s voltage level
increases
None required
!

CHAPTER 2: MPS-488HP FRONT AND REAR PANELS
10
Green Load Current LEDs (1–8)
The green Load Current LEDs indicate whether loudspeak-
ers are connected to the Channel Outputs and receiving
power. As a channel’s audio signal increases, its LED glows
brighter. If an LED is not lit, check that the channel’s Voltage
LED is lit and verify the cable connection to the loudspeaker.
The MPS-488HP’s intelligent circuit protection shields con-
nected loudspeakers from surges and shorts. When a green
Voltage LED blinks and its corresponding blue Load Current
LED is unlit, a surge or short has been detected for the
channel. If a surge or short is encountered, power down the
MPS-488HP and inspect the loudspeaker cabling for that
channel.
Table 2 lists the possible states for the Load Current LEDs.
CAUTION: When a green Voltage LED is unlit
and its corresponding blue Load Current LED is
blinking, indicating a surge or short for the channel,
power down the MPS-488HP and inspect the loud-
speaker cabling for that channel.
MPS-488HP REAR PANEL
The MPS-488HP rear panel includes an AC Input connector,
eight Channel Inputs for receiving source audio, eight Chan-
nel Outputs for delivering DC power and balanced audio,
and seven Link switches for routing audio from inputs to
outputs.
AC Input
The MPS-488HP has a PowerCon twist-lock AC Input con-
nector (line, neutral/line, earth). The connector can accept
different power cord types for outlets used throughout the
world. Make sure to use the correct power cord for the AC
power in your area. The MPS-488HP operates at an AC volt-
age range of 100–240 V at 50–60 Hz.
Channel Inputs
Up to eight channels of balanced audio are received from the
MPS-488HP’s eight Channel Inputs. The inputs are equipped
with XLR female connectors (pin 1, ground; pin 2, signal pos-
itive; pin 3, signal negative). Make sure to use standard bal-
anced XLR cables with all three pins connected on both
ends.
Channel Inputs default to being routed to their correspond-
ing Channel Outputs but can also be routed to adjacent out-
puts with the Link switches, though this affects their input
impedance (see “Input Impedance for Linked Channel
Inputs” on page 11).
Table 2: Load Current LEDs
State Cause Recommended Action
Unlit
(all LEDs)
MPS-488HP not pow-
ered on or no loudspeak-
ers connected
Verify the MPS-488HP is
powered on and verify its
power source; inspect
the loudspeaker cabling
Unlit
(single LED)
No loudspeaker con-
nected
Power down the
MPS-488HP and inspect
the loudspeaker cabling
for the channel
Blinking
(all LEDs)
Internal failure encoun-
tered
Service required
Blinking
(single LED)
Surge or short encoun-
tered for the channel
(corresponding Voltage
LED is unlit)
Power down the
MPS-488HP and inspect
the loudspeaker cabling
for the channel
Glows
brighter
(single LED)
LED glows brighter
as channel’s audio
signal increases
None required
!
MPS-488HPp Power Supply Rear Panel
MPS-488HPe Power Supply Rear Panel
MPS-488HP Channel Inputs

MPS-488HP OPERATING INSTRUCTIONS
11
Link Switches
Link switches determine how Channel Inputs are routed to
Channel Outputs. When a Channel Input’s Link switch is
OFF (set to the down position), the input is only routed to its
corresponding output: for example, Channel Input 1 routed
to Channel Output 1. When a Link switch is ON (set to the
up position), the input is routed to its corresponding output
and the next adjacent output: for example, Channel Input 1
routed to Channel Output 1 and Channel Output 2. If multi-
ple, adjacent Link switches are enabled, the input is routed
to each adjacent output: for example, Channel Input 1
routed to Channel Outputs 1, 2, and 3.
NOTE: Channel Inputs are inactive when the
Link switch for the preceding Channel Input is
enabled. Connections should not be made to inactive
Channel Inputs.
Routing Audio Inputs with the Link Switches
The following examples illustrate several common routing
applications for the MPS-488HP.
Routing One Input to Eight Outputs
To route one Channel Input to eight Channel Outputs:
■Set all Link switches to ON.
Routing Two Inputs to Four Outputs Each
To route two Channel Inputs to four Channel Outputs each:
1. Set the Link 4 switch to OFF and all other Link switches
to ON.
Routing Eight Inputs to Eight Separate Outputs
To route eight Channel Inputs to eight separate Channel
Outputs:
■Set all Link switches to OFF.
Input Impedance for Linked Channel Inputs
When a Link switch is enabled, the Channel Input’s unbuf-
fered source signal is transmitted in parallel to each linked
Channel Output. This causes the Channel Input’s imped-
ance (normally 10 kOhms for one loudspeaker) to be
reduced for each linked output. For example:
■1 Channel Output, 10 kOhm input impedance
■2 Channel Outputs, 5 kOhm input impedance
■4 Channel Outputs, 2500 ohms input impedance
■8 Channel Outputs, 1250 ohms input impedance
MPS-488HP Link Switches
Link 1 Link 2 Link 3 Link 4 Link 5 Link 6 Link 7
On On On On On On On
123 1111 467851111
Link 1 Link 2 Link 3 Link 4 Link 5 Link 6 Link 7
On On On Off On On On
Link 1 Link 2 Link 3 Link 4 Link 5 Link 6 Link 7
Off Off Off Off Off Off Off
123 115545678 1155
12 1 3 5 7456 8372468

CHAPTER 2: MPS-488HP FRONT AND REAR PANELS
12
To avoid distortion when linking Channel Inputs, make sure
the source device can drive the total load impedance of the
linked loudspeakers. The source device must be capable of
delivering a minimum of 16 dBV (6.3 V rms into 600 ohms) to
yield the maximum peak SPL over the operating bandwidth
of the loudspeaker.
NOTE: Most source devices are capable of
driving loads no smaller than 10 times their
output impedance. To drive eight loudspeakers
linked from a single Channel Input, the source device
should have an output impedance of approximately
100 ohms or less.
Channel Outputs
The MPS-488HP’s eight Channel Outputs deliver DC power
(48 V DC) and balanced audio to up to eight loudspeakers.
The channel outputs are available as either Phoenix 5-pin
male connectors (on the MPS-488HPp model) or EN3 5-pin
male connectors (on the MPS-488HPe model).
NOTE: For information on cable requirements
for your loudspeaker, refer to its operating
instructions. For information on cables and cable
accessories available from Meyer Sound, see
Appendix A, “MPS-488HP Accessories.” For infor-
mation on cable assembly, see Appendix B, “Phoenix
and EN3 Cable Assembly.”
TIP: A single composite cable (such as Belden
1502 or equivalent) wired for both DC power
and balanced audio can be used to connect loud-
speakers to Channel Outputs.
CAUTION: When wiring cable connections for
MPS-488HP Channel Outputs, it is extremely
important that each pin in the connector be wired cor-
rectly. Make sure the 48 V DC from the MPS-488HP is
wired directly (and only) to the 48 V DC pins on the
loudspeaker connector, and that the polarity is
observed (negative to negative, positive to positive) to
avoid damage to the loudspeaker. In addition, make
sure that audio pins are wired correctly; polarity rever-
sals for audio signals affect system performance.
MPS-488HPp Channel Outputs
The MPS-488HPp Channel Outputs are Phoenix 5-pin male
connectors with three pins for balanced audio (positive, neg-
ative, and shield) and two pins for DC Power (positive and
negative). The pins are clearly labeled on the MPS-488HPp
rear panel.
Each MPS-488HPp comes with eight Phoenix 5-pin female
cable connectors for assembling loudspeaker cables.
MPS-488HPe Channel Outputs
The MPS-488HPe Channel Outputs are EN3 5-pin female
connectors with three pins for balanced audio (positive,
negative, and shield) and two pins for DC Power (positive
and negative). The pins are clearly labeled on the
MPS-488HPe rear panel.
Each MPS-488HPe comes with eight EN3 5-pin male cable
connectors for assembling loudspeaker cables.
MPS-488HPp Channel Outputs
MPS-488HPe Channel Outputs
!

MPS-488HP OPERATING INSTRUCTIONS
13
MPS-488HP CURRENT DRAW
The current draw for the MPS-488HP and its connected
loudspeakers 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 sec-
onds. 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. This current rating is also used as a rat-
ing for slow-reacting thermal breakers.
■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 cal-
culating 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.
For current draw values for the MPS-488HP with connected
loudspeakers, see Appendix C, “MPS-488HP Specifica-
tions.”
The minimum electrical service amperage required by an
MPS-488HP is the sum of the Maximum Long-Term Contin-
uous Current for all loudspeakers connected to the
MPS-488HP. An additional 30 percent above the minimum
amperage is recommended to prevent peak voltage drops at
the service entry.
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 window.
SAFETY ISSUES
Pay close attention to these important electrical and safety
issues.
■The MPS-488HP requires a grounded outlet.
■Do not use a ground-lifting adapter or cut the AC cable
ground pin.
■Keep all liquids away from the MPS-488HP to avoid haz-
ards from electrical shock.
■Do not operate the unit if the power cables are frayed or
broken.
Earth ground
Chassis ground

CHAPTER 2: MPS-488HP FRONT AND REAR PANELS
14

15
CHAPTER 3: CONNECTING LOUDSPEAKERS TO THE MPS-488HP
NOTE: For information on cable requirements
for your loudspeaker, refer to its operating
instructions. For information on cables and cable
accessories available from Meyer Sound, see
Appendix A, “MPS-488HP Accessories.” For infor-
mation on cable assembly, see Appendix B, “Phoenix
and EN3 Cable Assembly.”
CAUTION: When wiring cable connections for
MPS-488HP Channel Outputs, it is extremely
important that each pin in the connector be wired cor-
rectly. Make sure the 48 V DC from the MPS-488HP is
wired directly (and only) to the 48 V DC pins on the
loudspeaker connector, and that the polarity is
observed (negative to negative, positive to positive) to
avoid damage to the loudspeaker. In addition, make
sure that audio pins are wired correctly; polarity rever-
sals for audio signals affect system performance.
To connect loudspeakers to the MPS-488HP:
1. Power off the MPS-488HP.
2. Connect audio sources (from a mixer or processor) to
the MPS-488HP Channel Inputs. Use balanced XLR
cables.
3. Use the MPS-488HP Link switches to route Channel
Inputs to the desired Channel Outputs (see “Link
Switches” on page 11).
4. Connect the loudspeakers to the MPS-488HP Channel
Outputs. Use composite cables (such as Belden 1502 or
equivalent) wired for both DC power and balanced audio
and outfitted with the appropriate connectors.
■When connecting loudspeakers equipped with Phoenix
connectors to the MPS-488HPp power supply, use
Phoenix 5-pin female to Phoenix 5-pin female cables.
TIP: You can use two separate cables for loud-
speaker connections: a 2-conductor cable for
DC power and a 3-conductor cable for balanced
audio, both attached to a single Phoenix connector
on each cable end. This allows you to use a larger
gauge for the DC cable so you can achieve longer
cable runs.
!

CHAPTER 3: CONNECTING LOUDSPEAKERS TO THE MPS-488HP
16
■When connecting loudspeakers equipped with EN3 con-
nectors to the MPS-488HPe power supply, use EN3 5-
pin male to EN3 5-pin female cables.
■To join two EN3 cables, one with an EN3 5-pin male
cable mount connector to one with an EN3 5-pin female
cable mount connector, use an EN3 5-pin female-to-
male cable coupler (PN 28.163.033.01).
5. Power on the MPS-488HP and monitor the LEDs on its
front panel to verify the connections (see “Voltage and
Load Current LEDs (1–8)” on page 9).
6. Check loudspeaker LEDs to verify whether the loud-
speakers are ready to reproduce audio.
7. Enable output from the audio sources (from the mixer or
processor) connected to the MPS-488HP.

17
APPENDIX A: MPS-488HP ACCESSORIES
PHOENIX AND EN3 CABLE CONNECTORS AND ADAPTERS
The following cable connectors and adapters are available from Meyer Sound.
PHOENIX AND EN3 LOUDSPEAKER CABLES
The following Phoenix and EN3 cables are available from Meyer Sound and can be used to connect loudspeakers to
MPS-488HP power supplies.
NOTE: Phoenix and EN3 loudspeaker cables and bulk cable use Belden 1502R (regular) or Belden 1502P
(plenum) cable. Belden 1502 is a composite cable comprised of two 18 AWG wires for DC power, two 22 AWG
wires for balanced audio, and one 24 AWG wire for audio shield.
Phoenix and EN3 Cable Connectors and Adapters
Part Number Connector/Adapter Use
484.065 Phoenix 5-pin female cable mount connec-
tor
Connects to MPS-488HPp Channel Outputs and
loudspeakers equipped with Phoenix connectors
468.069 EN3 5-pin female cable mount connector Connects to loudspeakers equipped with EN3 con-
nectors
468.071 EN3 5-pin male cable mount connector Connects to MPS-488HPe Channel Outputs
468.072 EN3 5-pin female inline cable adapter Connects to EN3 5-pin male cable mount connector
468.073 EN3 5-pin male inline cable adapter Connects to EN3 5-pin female cable mount connec-
tors
28.163.033.01 Cable coupler EN3 5-pin female-to-male
(5-inch, 0.12 m)
Joins two cables: one with an EN3 5-pin male cable
mount connector to one with an EN3 5-pin female
cable mount connector
Phoenix and EN3 Loudspeaker Cables
Part Number Cable Color Coating Length
524.014 Bulk (no connectors) Black Regular 500 ft spool
524.015 Bulk (no connectors) White Plenum 500 ft spool
28.163.009.01 EN3 5-pin female to pigtail Black Regular 10 ft
28.163.009.11 EN3 5-pin female to pigtail White Plenum 10 ft
28.163.009.21 EN3 5-pin female to EN3 5-pin male Black Regular 10 ft
28.163.009.22 20 ft
28.163.009.23 30 ft
28.163.009.24 50 ft
28.163.009.25 100 ft
28.163.009.26 150 ft

APPENDIX A: MPS-488HP ACCESSORIES
18
28.163.009.31 EN3 5-pin female to EN3 5-pin male White Plenum 10 ft
28.163.009.32 20 ft
28.163.009.33 30 ft
28.163.009.34 50 ft
28.163.009.35 100 ft
28.163.009.36 150 ft
28.163.033.01 Cable coupler EN3 5-pin female-to-male (joins two cables: one with an EN3 5-pin male cable
mount connector to one with an EN3 5-pin female cable mount connector)
28.163.009.41 EN3 5-pin female to Phoenix 5-pin female Black Regular 10 ft
28.163.009.42 20 ft
28.163.009.43 30 ft
28.163.009.44 50 ft
28.163.009.45 100 ft
28.163.009.46 150 ft
28.163.009.51 EN3 5-pin female to Phoenix 5-pin female White Plenum 10 ft
28.163.009.52 20 ft
28.163.009.53 30 ft
28.163.009.54 50 ft
28.163.009.55 100 ft
28.163.033.01 150 ft
Phoenix and EN3 Loudspeaker Cables
Part Number Cable Color Coating Length

19
APPENDIX B: PHOENIX AND EN3 CABLE ASSEMBLY
CAUTION: When wiring cable connections for MPS-488HP Channel Outputs, it is extremely important that each
pin in the connector be wired correctly. Make sure the 48 V DC from the MPS-488HP is wired directly (and only)
to the 48 V DC pins on the loudspeaker connector, and that the polarity is observed (negative to negative, positive to
positive) to avoid damage to the loudspeaker. In addition, make sure that audio pins are wired correctly; polarity rever-
sals for audio signals affect system performance.
ASSEMBLING EN3-TO-EN3 LOUDSPEAKER CABLES
When connecting loudspeakers equipped with EN3 connectors to the MPS-488HPe power supply, you need an EN3 5-pin
female to EN3 5-pin male cable. The following procedure documents how to assemble this cable. If you are starting with an
EN3-to-pigtail cable, you can skip step 5 in this procedure.
NOTE: Cable mount connectors cannot connect to other cable mount connectors. Cable mount connectors
can only connect to panel mount connectors (like those on the MPS-488HPe) or inline connectors. To extend
cables with EN3 connectors on both ends you can use an EN3 5-pin female-to-male cable coupler.
To assemble an EN3-to-EN3 loudspeaker cable:
1. Disassemble the EN3 5-pin male connector and feed one end of the cable through the boot, cable clamp housing, and
coupling ring.
Assembled EN3-to-EN3 Cable
Disassembled EN3 5-Pin Male Cable Mount Connector
!
Cable clamp
housing
Boot Coupling ring
Cord connector

APPENDIX B: PHOENIX AND EN3 CABLE ASSEMBLY
20
2. If the cable has not been stripped, strip the outer shielding 1 inch and then strip the black, red, blue, and white wires
.275 inch.
3. Solder the five exposed conductors to the five pins on the EN3 cord connector using the following wiring scheme.
4. Reassemble the EN3 5-pin male connector:
■Align the coupling ring’s side notches with the cord connector’s side notches and slide the couple ring onto the cord
connector.
■Carefully insert the end of the cable clamp housing into the cord connector until it locks into place. Snap the cable
clamps in the cable clamp housing into their compartments.
■Slide the boot forward so it covers the cable clamp housing completely.
Pin Destinations for EN3 5-Pin Male Cable Mount Connector
1”
0.275”
Pin #5, White,
audio (+)
Pin #4, Blue,
audio (–)
Pin #2, Red,
48 V DC (+)
Pin #1, Black,
48 V DC (–)
Pin #3, Unshielded,
audio shield
Pin #5, White,
audio (+)
Pin #4, Blue,
audio (–)
REAR
FRONT
Dimple identifies Pin #1