Extron electronics MPA 401-100V User Manual

MPA 401 Series

Mini Power Amplifiers

User Guide

Audio

68-1436-01 Rev. C

12 10

Precautions

Safety Instructions • English

This symbol is intended to alert the user of important operating and maintenance
(servicing) instructions in the literature provided with the equipment.

This symbol is intended to alert the user of the presence of uninsulated dangerous
voltage within the product enclosure that may present a risk of electric shock.

Caution

Read Instructions • Read and understand all safety and operating instructions before using the equipment.

Retain Instructions • The safety instructions should be kept for future reference.

Follow Warnings • Follow all warnings and instructions marked on the equipment or in the user

information.

Avoid Attachments • Do not use tools or attachments that are not recommended by the equipment

manufacturer because they may be hazardous.

Consignes de Sécurité • Français

Ce symbole sert à avertir l’utilisateur que la documentation fournie avec le matériel
contient des instructions importantes concernant l’exploitation et la maintenance
(réparation).

Ce symbole sert à avertir l’utilisateur de la présence dans le boîtier de l’appareil
de tensions dangereuses non isolées posant des risques d’électrocution.

Attention

Lire les instructions• Prendre connaissance de toutes les consignes de sécurité et d’exploitation avant

d’utiliser le matériel.

Conserver les instructions• Ranger les consignes de sécurité afin de pouvoir les consulter à l’avenir.

Respecter les avertissements • Observer tous les avertissements et consignes marqués sur le matériel ou

présentés dans la documentation utilisateur.

Eviter les pièces de xation • Ne pas utiliser de pièces de fixation ni d’outils non recommandés par le

fabricant du matériel car cela risquerait de poser certains dangers.

Sicherheitsanleitungen • Deutsch

Dieses Symbol soll dem Benutzer in der im Lieferumfang enthaltenen
Dokumentation besonders wichtige Hinweise zur Bedienung und Wartung
(Instandhaltung) geben.

Dieses Symbol soll den Benutzer darauf aufmerksam machen, daß im Inneren des
Gehäuses dieses Produktes gefährliche Spannungen, die nicht isoliert sind und
die einen elektrischen Schock verursachen können, herrschen.

Achtung

Lesen der Anleitungen • Bevor Sie das Gerät zum ersten Mal verwenden, sollten Sie alle Sicherheits-und

Bedienungsanleitungen genau durchlesen und verstehen.

Aufbewahren der Anleitungen • Die Hinweise zur elektrischen Sicherheit des Produktes sollten Sie

aufbewahren, damit Sie im Bedarfsfall darauf zurückgreifen können.

Befolgen der Warnhinweise • Befolgen Sie alle Warnhinweise und Anleitungen auf dem Gerät oder in der

Benutzerdokumentation.

Keine Zusatzgeräte • Verwenden Sie keine Werkzeuge oder Zusatzgeräte, die nicht ausdrücklich vom

Hersteller empfohlen wurden, da diese eine Gefahrenquelle darstellen können.

Warning

Power sources • This equipment should be operated only from the power source indicated on the product. This

equipment is intended to be used with a main power system with a grounded (neutral) conductor. The
third (grounding) pin is a safety feature, do not attempt to bypass or disable it.

Power disconnection • To remove power from the equipment safely, remove all power cords from the rear of

the equipment, or the desktop power module (if detachable), or from the power source receptacle (wall
plug).

Power cord protection • Power cords should be routed so that they are not likely to be stepped on or pinched by

items placed upon or against them.

Servicing • Refer all servicing to qualified service personnel. There are no user-serviceable parts inside. To

prevent the risk of shock, do not attempt to service this equipment yourself because opening or removing
covers may expose you to dangerous voltage or other hazards.

Slots and openings • If the equipment has slots or holes in the enclosure, these are provided to prevent

overheating of sensitive components inside. These openings must never be blocked by other objects.

Lithium battery • There is a danger of explosion if battery is incorrectly replaced. Replace it only with the

same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the
instructions of the manufacturer.

Avertissement

Alimentations• Ne faire fonctionner ce matériel qu’avec la source d’alimentation indiquée sur l’appareil. Ce

matériel doit être utilisé avec une alimentation principale comportant un fil de terre (neutre). Le troisième
contact (de mise à la terre) constitue un dispositif de sécurité : n’essayez pas de la contourner ni de la
désactiver.

Déconnexion de l’alimentation• Pour mettre le matériel hors tension sans danger, déconnectez tous les cordons

d’alimentation de l’arrière de l’appareil ou du module d’alimentation de bureau (s’il est amovible) ou
encore de la prise secteur.

Protection du cordon d’alimentation • Acheminer les cordons d’alimentation de manière à ce que personne ne

risque de marcher dessus et à ce qu’ils ne soient pas écrasés ou pincés par des objets.

Réparation-maintenance • Faire exécuter toutes les interventions de réparation-maintenance par un technicien

qualifié. Aucun des éléments internes ne peut être réparé par l’utilisateur. Afin d’éviter tout danger
d’électrocution, l’utilisateur ne doit pas essayer de procéder lui-même à ces opérations car l’ouverture ou le
retrait des couvercles risquent de l’exposer à de hautes tensions et autres dangers.

Fentes et orices • Si le boîtier de l’appareil comporte des fentes ou des orifices, ceux-ci servent à empêcher

les composants internes sensibles de surchauffer. Ces ouvertures ne doivent jamais être bloquées par des
objets.

Lithium Batterie • Il a danger d’explosion s’ll y a remplacment incorrect de la batterie. Remplacer uniquement

avec une batterie du meme type ou d’un ype equivalent recommande par le constructeur. Mettre au reut les
batteries usagees conformement aux instructions du fabricant.

Vorsicht

Stromquellen • Dieses Gerät sollte nur über die auf dem Produkt angegebene Stromquelle betrieben werden.

Dieses Gerät wurde für eine Verwendung mit einer Hauptstromleitung mit einem geerdeten (neutralen)
Leiter konzipiert. Der dritte Kontakt ist für einen Erdanschluß, und stellt eine Sicherheitsfunktion dar. Diese
sollte nicht umgangen oder außer Betrieb gesetzt werden.

Stromunterbrechung • Um das Gerät auf sichere Weise vom Netz zu trennen, sollten Sie alle Netzkabel

aus der Rückseite des Gerätes, aus der externen Stomversorgung (falls dies möglich ist) oder aus der
Wandsteckdose ziehen.

Schutz des Netzkabels • Netzkabel sollten stets so verlegt werden, daß sie nicht im Weg liegen und niemand

darauf treten kann oder Objekte darauf- oder unmittelbar dagegengestellt werden können.

Wartung • Alle Wartungsmaßnahmen sollten nur von qualiziertem Servicepersonal durchgeführt werden.

Die internen Komponenten des Gerätes sind wartungsfrei. Zur Vermeidung eines elektrischen Schocks
versuchen Sie in keinem Fall, dieses Gerät selbst öffnen, da beim Entfernen der Abdeckungen die Gefahr
eines elektrischen Schlags und/oder andere Gefahren bestehen.

Schlitze und Öffnungen • Wenn das Gerät Schlitze oder Löcher im Gehäuse aufweist, dienen diese zur

Vermeidung einer Überhitzung der empndlichen Teile im Inneren. Diese Öffnungen dürfen niemals von

anderen Objekten blockiert werden.

Litium-Batterie • Explosionsgefahr, falls die Batterie nicht richtig ersetzt wird. Ersetzen Sie verbrauchte

Batterien nur durch den gleichen oder einen vergleichbaren Batterietyp, der auch vom Hersteller
empfohlen wird. Entsorgen Sie verbrauchte Batterien bitte gemäß den Herstelleranweisungen.

Instrucciones de seguridad • Español

Este símbolo se utiliza para advertir al usuario sobre instrucciones importantes
de operación y mantenimiento (o cambio de partes) que se desean destacar en el
contenido de la documentación suministrada con los equipos.

Este símbolo se utiliza para advertir al usuario sobre la presencia de elementos
con voltaje peligroso sin protección aislante, que puedan encontrarse dentro de la
caja o alojamiento del producto, y que puedan representar riesgo de electrocución.

Precaucion

Leer las instrucciones • Leer y analizar todas las instrucciones de operación y seguridad, antes de usar el

equipo.

Conservar las instrucciones • Conservar las instrucciones de seguridad para futura consulta.

Obedecer las advertencias • Todas las advertencias e instrucciones marcadas en el equipo o en la

documentación del usuario, deben ser obedecidas.

Evitar el uso de accesorios • No usar herramientas o accesorios que no sean especificamente recomendados

por el fabricante, ya que podrian implicar riesgos.

安全须知 • 中文

这个符号提示用户该设备用户手册中有重要的操作和维护说明。

这个符号警告用户该设备机壳内有暴露的危险电压，有触电危险。

注意

阅读说明书 • 用户使 用该设备前必须阅读并理 解所有安全和 使用说明。
保存说明书 • 用户应保存安全说明 书以备将来使用。
遵守警告 • 用户应遵守产品和用户指南上的所有安 全和操作说明。
避免追加 • 不要使 用该产品厂商没有推荐的工具或追加设备，以避免危险。

Advertencia

Alimentación eléctrica • Este equipo debe conectarse únicamente a la fuente/tipo de alimentación eléctrica

indicada en el mismo. La alimentación eléctrica de este equipo debe provenir de un sistema de distribución
general con conductor neutro a tierra. La tercera pata (puesta a tierra) es una medida de seguridad, no
puentearia ni eliminaria.

Desconexión de alimentación eléctrica • Para desconectar con seguridad la acometida de alimentación eléctrica

al equipo, desenchufar todos los cables de alimentación en el panel trasero del equipo, o desenchufar el
módulo de alimentación (si fuera independiente), o desenchufar el cable del receptáculo de la pared.

Protección del cables de alimentación • Los cables de alimentación eléctrica se deben instalar en lugares donde

no sean pisados ni apretados por objetos que se puedan apoyar sobre ellos.

Reparaciones/mantenimiento • Solicitar siempre los servicios técnicos de personal calicado. En el interior no

hay partes a las que el usuario deba acceder. Para evitar riesgo de electrocución, no intentar personalmente
la reparación/mantenimiento de este equipo, ya que al abrir o extraer las tapas puede quedar expuesto a
voltajes peligrosos u otros riesgos.

Ranuras y aberturas • Si el equipo posee ranuras o orificios en su caja/alojamiento, es para evitar el

sobrecalientamiento de componentes internos sensibles. Estas aberturas nunca se deben obstruir con otros

objetos.

Batería de litio • Existe riesgo de explosión si esta batería se coloca en la posición incorrecta. Cambiar esta

batería únicamente con el mismo tipo (o su equivalente) recomendado por el fabricante. Desachar las
baterías usadas siguiendo las instrucciones del fabricante.

警告

电源 • 该设备只能使用产品上标明的电源。 设备必须使用有地线的供电系统供电。 第三条线

（地线）是安全设施，不能不用或跳过 。
拔掉电源 • 为安全 地从设备拔掉电源，请拔掉所有设备后或桌面电源的电源线，或任何接到市电

系统的电源 线。

电源线保护 • 妥善布线， 避免被踩踏，或重物挤压。
维护 • 所有维修必须由认证的维修人员进行。 设备内部没有用户可以更换的零件。为避免出现触

电危险不 要自己试图打开设备盖子 维修该设备。

通风孔 • 有些设备机壳上有通风槽或孔，它们是用来 防止机内敏感元件过热。 不要用任 何东西

挡住通风孔。

锂电池 • 不正确的更换电池会有爆炸的危险。必须使用与厂家推荐的相同或相近型号的电池。按

照生产厂的建议处 理废弃电 池。

FCC Class B Notice

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a resi­dential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and
used in accordance with the instructions, may cause harmful interference to radio communications. However, there
is no guarantee that the interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the following measures:

z Reorient or relocate the receiving antenna.

z Increase the separation between the equipment and receiver.

z Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

z Consult the dealer or an experienced radio/TV technician for help.

NOTE: This unit was tested with shielded cables on the peripheral devices. Shielded cables must be used with

the unit to ensure compliance with FCC emissions limits.

For more information on safety guidelines, regulatory compliances, EMI/EMF compliance, accessibility, and
related topics, click here.

Notational Conventions Used in this Guide

TIP: A tip provides a suggestion to make setting up or working with the device easier.

NOTE: A note draws attention to important information.

CAUTION: A caution warns of things or actions that might damage the equipment.

WARNING: A warning warns of things or actions that might cause injury, death, or

other severe consequences.

Copyright

© 2010 Extron Electronics. All rights reserved.

Trademarks

All trademarks mentioned in this guide are the properties of their respective owners.

Contents

Introduction ............................................ 1

MPA 401-70V and MPA 401-100V Description 1

MPA 401-70V and MPA 401-100V Features ..... 2

Rear Panel and Cabling .......................... 3

Rear Panel Cabling ........................................... 3

Power Input ..................................................... 4

Audio Inputs .................................................... 5

Remote Input Connector.................................. 6

Speaker Connections ....................................... 6

Setup and Operation .............................. 7

Front Panel Features ......................................... 7

Setting Input Level ........................................... 8

Setting Bass and Treble .................................... 8

Remote Control Options .................................. 9

Specications .........................................10

Parts and Accessories ............................12

Included Parts ................................................ 12

Optional Accessories ...................................... 13

Mounting ................................................14

Plenum Placement ......................................... 14

Tabletop Placement ........................................ 14

Rack Mounting .............................................. 15

UL Guidelines For Rack Mounting .............. 15

Rack Mounting Procedure .......................... 16

Under-desk Mounting .................................... 16

Through-desk Mounting ................................ 16

Projector Mounting ........................................ 16

MPA 401-70V and MPA 401-100V • Contents v

MPA 401-70V and MPA 401-100V • Contents vi

Introduction

Extron

This guide contains information about the Extron MPA 401-70V and MPA 401-100V mini
power amplifiers with instructions for experienced installers on how to install, configure,
and operate the equipment. Unless otherwise specified, references in this guide to the
“amplifier,” “MPA,” or “MPA 401” relate to the features or operation of either amplifier.

MPA 401-70V and MPA 401-100V Description

The Extron MPA 401-70V and MPA 401-100V integrated mini power amplifiers provide
mono amplification for speaker systems that require compact and economical audio
solutions. Both amplifiers accept balanced or unbalanced, stereo or mono inputs and
provide a summed mono output. The MPA 401-70V delivers up to 40 watts (rms) for a
high-impedance, 70 V distributed sound system. The MPA 401-100V delivers up to 40
watts (rms) for a high-impedance, 100 V distributed sound system.

Front panel controls allow easy adjustment of bass, treble, and input levels. Volume can be
controlled remotely by the Extron VCM 100, VC 50, or MLA VC 10.

Both amplifiers feature high efficiency, Class D amplifier design with advanced CDRS™
(Class D Ripple Suppression) technology that eliminates EMI emissions and interference
with sensitive A/V equipment. The design allows the amplifiers to be fanless and operate
in environments with little or no ventilation. Both amplifiers meet UL 2043 for smoke and
fire code for above-the-ceiling installations.

SI 3CT LP

Full-Range

Extron
MPA 401

Mini Power
Amplier

MPA 401-70V

CLASS 2 WIRING

OUTPUT

DO NOT GROUND

OR SHORT

US

®

SPEAKER OUTPUTS!

10V 50mA

LISTED

VOL/MUTE

17TT

70V

AUDIO/VIDEO
APPARATUS

INPUTS

(MONO)

REMOTE

R

L

(MONO)

L

POWER

R

12V

1.5A MAX

Extron
DVS 304 DVI AD

Digital Video
Scaler
w/ Audio

R

3

L

INPUTS

2

L R

R

1

100-240V .3A

L

50/60 Hz

Audio

Ceiling Speakers

RGB/R-Y,Y,B-Y/YC/VID

R-Y
/C

Y

4

/VID

SDI

DVI-I

YC

I

I

3

B-Y

N

N

P

P

2

U

VID

U

T

T

1

R

OUTPUT

L

AUDIO

4

L R

VCR
(Video)

G
/Y

R
/R-Y

V

H/
HV

VOLUME

VC 50

Extron

RS-232

O

O

LAN

B

U

U

/B-Y

T

T

RESET

P

P

LINK

U

U

ACT

T

T

DVD
(Component)

Extron VC 50

Volume Controller

Figure 1. Typical Application for the MPA 401

DSS Receiver
(S-video)

Extron

1

2

DISPLAY

MLC 104 IP Plus

OFF

3

ON

4

VOLUME

Controller

CONFIG

MLC 104 IP

Flat Panel
Display
(DVI)

DBS RECEIVER

Laptop
(RGB)

MPA 401-70V and MPA 401-100V • Introduction 1

MPA 401-70V and MPA 401-100V Features

Patented CDRS (Class D Ripple Suppression) — CDRS is an Extron patented
technology that eliminates high frequency switching ripple and EMI emissions found in
all Class D amplifiers. CDRS dramatically improves audio performance over conventional
Class D amplifier designs and enables Extron power amplifiers to be situated near wireless
A/V devices without RF interference.

UL 2043 plenum rated — The amplifiers meet UL 2043 for smoke and heat release for
installation within a plenum airspace above a drop ceiling. Above-the-ceiling placement
conceals the amplifier to prevent theft and is convenient for installing equipment when
space inside the room is limited.

Balanced and unbalanced buffered audio inputs — Both amplifiers accept balanced
or unbalanced, stereo or mono audio input signals on a captive screw connector, and
unbalanced audio on both RCA connectors and a 3.5 mm stereo mini jack.

NOTE: The amplifiers mix all right channel inputs to a single signal and all left channel

inputs to a second signal. The right signal and left signal are then summed to
produce a mono signal.

The three stereo inputs are individually buffered and can be connected to three separate
sources at the same time without altering performance.

Quick-plug speaker outputs — Speaker output is on a 5 mm screw lock captive screw
connector for quick installation.

®

ENERGY STAR

are ENERGY STAR qualified amplifier and energy efficient products that conserve energy
and reduce costs.

Auto-standby with fast power up — automatically places the amplifiers into standby
after 25 minutes of inactivity. They quickly return to full power status in less than one
second upon signal detection. The amplifiers consume just 6 watts when idle and less than
1 watt in standby mode.

Front panel bass, treble, and input level controls — Bass, treble, and input level are
easily adjusted from the front panel.

Fanless design — The amplifiers do not require fans or vents for cooling, ensuring quiet,
reliable operation.

Automatic clip limiter — Detects actual onset of clipping by comparing input and output
waveforms. Gain is automatically reduced with a slow attack and fast release to eliminate
clipping. This advanced limiter design protects the speakers from clipping distortion and
offers superior sonic characteristics compared to limiters that use signal compression.

Remote volume and mute control port — A rear panel, three-pin captive screw remote
input connector allows remote adjustment of volume and muting. In basic installations
without third-party control systems, this port allows the amplifiers to be remotely
controlled using the optional Extron VCM 100 series analog volume and mute controller or
VC 50 analog volume controller.

Compact size — The 1U, quarter rack width, 6 inch deep metal enclosure, offers flexible
mounting options.

qualied amplier — The MPA 401-70V and MPA 401-100V amplifiers

MPA 401-70V and MPA 401-100V • Introduction 2

Rear Panel and
Cabling

This section describes the rear panel features and cabling of the MPA 401-70V and
MPA 401-100V.

z Rear Panel Cabling

z Power Input

z Audio Inputs

z Remote Input Connector

z Speaker Connections

Rear Panel Cabling

The illustration below shows the rear panel of the amplifiers:

POWER

L

INPUTS

(MONO)

®

LISTED

17TT

AUDIO/VIDEO

APPARATUS

CLASS 2 WIRING

US

DO NOT GROUND

OR SHORT

SPEAKER OUTPUTS!

10V 50mA

VOL/MUTE

MPA 401-70V

OUTPUT

R

12V

1.5A MAX

1 5

POWER

12V

1.5A MAX

1 5

2

INPUTS

(MONO)

L

R

2

L (MONO)

3

3

®

LISTED

17TT

AUDIO/VIDEO

APPARATUS

L (MONO)

4

US

4

REMOTE

R

CLASS 2 WIRING

DO NOT GROUND

OR SHORT

SPEAKER OUTPUTS!

10V50mA

VOL/MUTE

REMOTE

R

70V

6

MPA 401-100V

OUTPUT

100V

6

Figure 2. MPA 401-70V and MPA 401-100V Rear Panel Features

MPA 401-70V and MPA 401-100V • Rear Panel and Cabling 3

Power Input

a Power connector — The MPA 401-100V ships with an Extron 36 W desktop power

supply (PS 1230 [part number 70-769-01]). The MPA 401-70V ships with either
the Extron 36 W desktop power supply or the Extron 12 VDC, 5 A power supply
(EPS 1250 C [part number 70-725-01]).

When using the EPS 1250 C power supply, connect the two pole, 3.5 mm captive
screw connector from the power supply to the power socket on the rear panel of the
MPA 401-70V, as shown below in figure 3. Ensure the connections have the correct
polarity as shown.

CAUTION: Always use a power supply supplied or specified by Extron. Use

of an unauthorized power supply voids all regulatory compliance
certification and may cause damage to the supply and the end
product.

Unless otherwise stated, the AC/DC adapters are not suitable for
use in air handling spaces or in wall cavities. The power supply is
to be located within the same vicinity as the Extron A/V processing
equipment in an ordinary location, Pollution Degree 2, secured to the
equipment rack within the dedicated closet, podium or desk.

The installation must always be in accordance with the applicable
provisions of National Electrical Code ANSI/NFPA 70, article 75
and the Canadian Electrical Code part 1, section 16. The power
supply shall not be permanently fixed to building structure or similar
structure.

NOTES: The length of the exposed wires in the stripping process is critical. The

ideal length is 3/16 inches (5 mm). Any longer and the exposed wires may
touch, causing a short circuit between them. Any shorter and the wires
can be easily pulled out even if tightly fastened by the captive screws.

Do not tin the wires. Tinned wire does not hold its shape and can become

MPA 401-70V

POWER

12V

1.5 A MAX

loose over time.

Power Receptacle

DC Power Cord
Captive Screw Connector

Ground
+12 VDC

Smooth

Power Supply

Output Cord

AC Power Cord

Ridges

AA

SECTION A–A

EPS 1250 C

Power Supply

(12 VDC, 5 A )

12V

1.5 A MAX

3/16"

(5 mm) Max.

Figure 3. Connecting the EPS 1250 C Power Supply to the MPA 401-70V

MPA 401-70V and MPA 401-100V • Rear Panel and Cabling 4

When using the PS 1230 power supply with either amplifier, connect one end of the

PS 1230 Power Supply

INPUTS

cd

Balanced Mono Input

Unbalanced Mono Input

DC power cord to one of the two pole, 3.5 mm captive screw connectors on the
power supply. Connect the other end into the power socket on the rear panel of the
amplifier, as shown in figure 4 below. The power cord connectors are already correctly
wired when shipped.

CAUTION: When the PS 1230 power supply is connected to the MPA 401, it

must not be shared with any other devices.

MPA 401 series

Amplifier

POWER

12V

1.5 A MAX

Power Receptacle

AC Power Cord

DC Power
Outputs

Audio Inputs

DC Power Cord
Captive Screw Connector

Tie

Wrap

Captive Screw
Connector

Power Supply

Output Cord

Figure 4. Connecting the PS 1230 Power Supply to an MPA 401 Amplier

(MONO)

Use the rear panel connections (see figure at right) to

L

connect audio inputs to the amplifier. Wire the connectors
as shown below. The balloon numbers refer to figure 2.

b RCA input connectors — These connectors accept

R

Tip (+)

unbalanced, line level audio signals. The input can be stereo
(using two RCA jacks) or mono (using a single RCA jack
plugged into the left/mono socket).

If unused, the connectors automatically terminate to lower the
noise floor.

Sleeve ( )

RCA Connector

Tip (L)

Ring (R)

c 3.5 mm stereo input — This input also accepts unbalanced,

line level audio signals through a 3.5 mm tip ring sleeve (TRS)
stereo jack. If unused, the connector automatically terminates
to lower the noise floor.

d Balanced or unbalanced audio

input connector — This 5-pole

3.5 mm captive screw connector
accepts line level, balanced or

Tip

Sleeve

Tip

Sleeve

Unbalanced Stereo Input

(high impedance)

unbalanced, mono or stereo audio
signals. See the notes on page 4
for important information about

Sleeve

Tip

connecting wires to captive screw
connectors.

L (MONO) R

Sleeve (s)

L (MONO) R

Sleeve ( )

3.5 mm TRS Connector

Tip

Ring

Tip

Ring

Balanced Stereo Input

(high impedance)

Tip

Ring

Sleeve

b

L (MONO)

R

L (MONO) R L (MONO) R

MPA 401-70V and MPA 401-100V • Rear Panel and Cabling 5

Remote Input Connector

e Remote input connector (see gure 2) — This 3-pole captive screw connector

allows the option of using a wall-mounted audio controller or MediaLink product to
control volume and mute levels remotely.

Options for remote control include the Extron VC 50, VCM 100 AAP, VCM 100 MAAP,
or MLA VC10. Third party 10k potentiometer volume controllers can also be
connected to this port. See the notes on page 4 for important information about
connecting wires to captive screw connectors.

Wire the remote control connector to the
VCM 100 MAAP as shown in the figure at right
and instructions below:

z Pin 1 is 10 VDC reference voltage.

z Pin 2 (VOL/MUTE) has two functions:

z It can be used as a variable voltage input. The volume control DC voltage

range is 0 to 10 V, with 0 V giving full attenuation and 10 V giving maximum
volume.

z It can be used for remote control muting. Sound is muted while the mute pin

is shorted to ground.

z Pin 3 is ground.

NOTE: All nominal levels are at ± 10%

Volume Pot
10K Ohms

2K

Mute
Switch

10 V

Vol/Mute

GND

Speaker Connections

More information about remote control of these amplifiers can be found on page 9.

f Speaker connection (see gure 2) — Connect the speakers

OUTPUT

to this socket using the 2-pole, 5 mm screw-lock captive screw
connector (shown at right).

The three left channel inputs (RCA, TRS and captive screw)
are summed to form Left Sum, with weightings proportional to their respective
sensitivities. Similarly the three right channel inputs are summed to form a Right Sum.
Left Sum and Right Sum are mixed and amplified to provide one high voltage, mono
output. The MPA 401-70V provides up to 40 W for a 70 V line distributed sound
system; the MPA 401-100V provides up to 40 W for a 100 V line distributed sound
system.

See the notes on page 4 for important information about connecting wires to
captive screw connectors.

CAUTION: Do not short the + and - outputs to each other or to ground ( ) as

this will damage the amplifier.

MPA 401-70V and MPA 401-100V • Rear Panel and Cabling 6

Setup and
Operation

This section provides information about the front panel features and operation of the
MPA 401-70V and MPA 401-100V:

z Front Panel Features

z Setting Input Level

z Setting Bass and Treble

z Remote Control Options

Front Panel Features

The front panels of the MPA 401-70V and MPA 401-100V are identical and shown below:

2

BASSLEVEL TREBLE

1

MPA 401

MINI POWER AMPLIFIER

Figure 5. MPA 401-70V or MPA 401-100V Front Panel

a Power LED — The green LED is on when the MPA 401 unit is receiving power and

active. It is amber when the unit is on standby.

b Potentiometers — These three front panel potentiometers are used to optimize level,

bass, and treble settings (see the following pages for further details).

MPA 401-70V and MPA 401-100V • Setup and Operation 7

Setting Input Level

BASSLEVEL TREBLE

Adjust the input level as follows:

1. If necessary, unplug the remote plug from the unit.

2. If connecting the amplifier to a system with

adjustable volume, set the volume to its lowest point.
Then adjust the level potentiometer fully counterclockwise to its minimum setting.

3. Set the system volume to its maximum level. No sound should come out.

4. Slowly increase the amplifier level until sound distortion starts to occur. Lower the level

slightly until the distortion disappears. This setting ensures that, whatever the system
volume setting may be, no clipping occurs.

Setting Bass and Treble

Adjust the bass and treble as follows:

1. Use the bass potentiometer to increase or decrease the bass shelving ±10 dB at

100 Hz and below.

2. Use the treble potentiometer to increase or decrease the treble shelving ±10 dB at

10 kHz and above.

NOTE: Turning the bass or treble potentiometers counterclockwise will decrease the

output at the specified frequencies. Turning the potentiometers clockwise
will increase the output. When the potentiometer is at the center detent, flat
response is achieved.

MPA 401

MINI POWER AMPLIFIER

MPA 401-70V and MPA 401-100V • Setup and Operation 8

Remote Control Options

Extron

SI 3CT LP

Full-Range
Ceiling Speakers

MPA 401-70V

CLASS 2 WIRING

OUTPUT

DO NOT GROUND

OR SHORT

US

®

SPEAKER OUTPUTS!

10V 50mA

LISTED

VOL/MUTE

17TT

70V

AUDIO/VIDEO
APPARATUS

INPUTS

(MONO)

REMOTE

R

L

(MONO)

L

POWER

R

12V

Extron

1.5A MAX

MPA 401

Mini Power
Amplier

Extron
DVS 304 DVI AD

Digital Video
Scaler
w/ Audio

I

I

N

N

P

P

U

U

T

T

R

OUTPUT

L

AUDIO

4

L R

3

L R

INPUTS

2

L R

R

1

100-240V .3A

L

50/60 Hz

Audio

VCR
(Video)

G
/Y

R
/R-Y

V

RGB/R-Y,Y,B-Y/YC/VID

H/

R-Y
/C

HV

Y

4

/VID

SDI

DVI-I

YC

3

B-Y

2

VID

1

Figure 6. MPA 401 Remote Control Options

MUTE

VOLUME

VCM 100 AAP

RS-232

O

O

LAN

B

U

U

/B-Y

T

T

RESET

P

P

LINK

U

U

ACT

T

T

DVD
(Component)

Extron

a

VCM 100 AAP

Volume/Mute Controller

DBS RECEIVER

DSS Receiver
(S-video)

Extron

b

MLC 104 IP Plus

Controller

1

2

DISPLAY

OFF

3

ON

4

VOLUME

CONFIG

MLC 104 IP

Laptop
(RGB)

Flat Panel
Display
(DVI)

1. Extron VCM 100 AAP volume and mute control — For a system designed to

control the volume of the amplifier directly, use a 10k Ohm potentiometer to control
volume via the remote port on the amplifier. Follow the instructions in the product
guide.

2. Using a MediaLink™ Controller — For a system with variable audio output,

connect the audio output to the audio input of the amplifier. In the above example, a
MediaLink controller adjusts the audio volume via a network connection. Follow the
instructions in the product guide.

MPA 401-70V and MPA 401-100V • Setup and Operation 9

Specications

Audio

Voltage gain

MPA 401-70V

RCA and TRS inputs ........... 222x (47 dB)

Captive screw input ........... 57x (35 dB)

MPA 401-100V

RCA and TRS inputs ........... 317x (50 dB)

Captive screw input ........... 81x (38 dB)

CMRR ............................................ 75 dB (typical) @ 1 kHz

Bass adjustment ............................. ±10 dB @ 100 Hz

Treble adjustment ........................... ±10 dB @ 10 kHz

Audio input

Number/signal type ........................ 1 stereo/mono, balanced/unbalanced input

2 stereo/mono, unbalanced inputs
(The three inputs are individually buffered and mixed together. Stereo signals
are actively summed into a mono signal.)

Connectors .................................... (1) 3.5 mm captive screw connector, 5 pole (main input)

(1) 3.5 mm mini audio jack (tip, ring, sleeve)

1 pair RCA

Impedance ..................................... >10k ohms balanced/unbalanced, DC coupled

Maximum level ............................... +20 dBu (balanced, captive screw) or +4 dBV (unbalanced, RCA/TRS) at

1% THD+N
Input sensitivity

RCA and TRS inputs ................. -10 dBV if driven by one input

-16 dBV if both inputs are summed

Captive screw input ................. +4 dBu if driven by one input

-2 dBu if both inputs are summed

NOTE: 0 dBu = 0.775 Vrms, 0 dBV = 1 Vrms, 0 dBV ≈ 2 dBu

Audio output

Number/signal type

MPA 401-70V .......................... 1 single channel (mono) 70 V

MPA 401-100V ........................ 1 single channel (mono) 100 V

Connectors .................................... (1) 5 mm screw lock captive screw connector, 2 pole

Load impedance

MPA 401-70V .......................... 125 ohms minimum

MPA 401-100V ........................ 250 ohms minimum

Frequency response ........................ 80 Hz to 20 kHz, +1 dB/-3 dB, 1 watt

THD + Noise ................................... <0.2% @ 1 kHz at 3 dB below clipping

S/N ................................................. >75 dB, 20 Hz to 20 kHz, unweighted

Damping factor .............................. >100

High pass filter ............................... 80 Hz, 12 dB/octave roll off

Amplifier type ................................ Class D

MPA 401-70V and MPA 401-100V • Specications 10

Output power

MPA 401-70V .......................... 40 watts (rms), 70 V, 1 kHz, 1% THD

MPA 401-100V ........................ 40 watts (rms), 100 V, 1 kHz, 1% THD

Control/remote — amplier

Control port ................................... (1) 3.5 mm captive screw connector, 3 pole

Pin configuration ............................ Pin 1 = +10 VDC (50 mA max.), pin 2 = volume/mute control (variable voltage),

pin 3 = GND

Volume control voltage range ......... 0 V (mute) to 10 V (maximum volume)

General

External power supply .................... 100 VAC to 240 VAC, 50-60 Hz, external; to 12 VDC, 3 A (min.), regulated

Power input requirements .............. 12 VDC, up to 5 A

Power consumption ....................... For amplifier and external power supply

Typical ..................................... 13 W (1/8 power, pink noise, at 125 ohms)

Quiescent ................................ 8 watts

Standby ................................... <1 watt (triggered by contact closure or after 25 minutes [±5 minutes] with no

signal)

Temperature/humidity .................... Storage: -40 to +158 °F (-40 to +70 °C) / 10% to 90%, noncondensing

Operating: +32 to +122 °F (0 to +50 °C) / 10% to 90%, noncondensing

Cooling .......................................... Convection, no vents

Thermal dissipation

Standby ................................... <1 watt (3 BTU/hr)

Idle .......................................... 6 watts (21 BTU/hr)

1/8 power, pink noise .............. 8 watts (28 BTU/hr)

Mounting

Rack mount ............................. Yes, with optional 1U rack shelf or back of rack mounting kit

Furniture mount ...................... Yes, with optional under-desk mounting kit

Pole mount .............................. Yes, with optional pole mounting kit

Enclosure type ................................ Metal

Enclosure dimensions ..................... 1.7" H x 4.3" W x 6.0" D (1U high, quarter rack wide)

(4.3 cm H x 10.9 cm W x 15.2 cm D)

(Depth excludes connectors.)

Product weight ............................... 0.6 lbs (0.3 kg)

Shipping weight ............................. 3 lbs (2 kg)

Vibration ........................................ ISTA 1A in carton (International Safe Transit Association)

Regulatory compliance

Safety ...................................... CE, c-UL, UL

UL rated for use in plenum airspaces: meets UL 2043 for heat and smoke

release, excluding the power supply; meets UL 60065 and IEC 60065 for A/V

equipment safety.

EMI/EMC ................................. CE, C-tick, FCC Class B, ICES Class B, VCCI

Environmental

MPA 401-70V .................... Complies with the appropriate requirements of CEC, ENERGY STAR® (ENERGY

STAR® qualified amplifier), EU code of conduct, RoHS, WEEE

MPA 401-100V .................. Complies with the appropriate requirements of CEC, EU code of conduct, RoHS,

WEEE

MTBF ............................................. 30,000 hours

Warranty ........................................ 3 years parts and labor

NOTES: All nominal levels are at ±10%

Specifications are subject to change without notice.

MPA 401-70V and MPA 401-100V • Specications 11

Parts and
Accessories

This section of the user guide contains information about:

z Included Parts

z Optional Accessories

Included Parts

Description Part Number

MPA 401-70V
or
MPA 401-100V

EPS 1250 C External 12 VDC, 5 A power supply
(MPA 401-70V)
or
PS 1230 External 36 W power supply
(MPA 401-70V and MPA 401-100V)

IEC power cord

(1) 2-pole 5 mm terminal block plug

(1) 5-pole 3.5 mm captive screw plug

(1) 3-pole 3.5 mm captive screw plug

(1) 2-pole 3.5 mm power captive screw plug

Tweeker (small screwdriver)

MPA 401-70V and MPA 401-100V Setup Guide

60-845-01

60-845-11

70-725-01

70-769-01

MPA 401-70V and MPA 401-100V • Parts and Accessories 12

Optional Accessories

Description Part Number

RSU 126 1U, 6 inch deep, universal rack kit 60-190-10

RSB 126 1U, 6 inch deep basic rack shelf 60-604-11

RSU 129 1U, 9.5 inch deep, universal rack kit 60-190-01

RSB 129 1U, 9.5 inch deep basic rack shelf 60-604-02

MBU 125 Under-desk mounting kit 70-077-01

MBD 129 Through-desk mounting kit 70-077-02

PMK 350 Pole mount kit 70-563-03

EPS 1250 C External power supply replacement kit 70-725-01

PS 1230 External 36 W power supply replacement kit 70-769-01

VC 50 Volume control wall plate 70-530-02

VCM 100 AAP Volume/mute - AAP 70-396-11

VCM 100 MAAP Volume/mute - MAAP 70-397-11

MLA-VC10 Volume control module 60-502-01

MLA VC10 Plus Volume control module 60-1090-01

SI 3CT LP Ceiling speakers 42-103-03

SI 26 CT Ceiling speakers 42-070-03

FF 120 T Ceiling speakers 42-120-13

FF 220 T Ceiling speakers 42-141-03

SPK14/1000 Non-Plenum 1000 feet (300 m) spool 22-152-03

SPK14P/1000 Plenum 1000 feet (300 m) spool 22-155-03

SPK16/1000 Non-Plenum 1000 feet (300 m) spool 22-151-03

SPK16P/1000 Plenum 1000 feet (300 m) spool 22-154-03

SPK18/1000 Non-Plenum 1000 feet (300 m) spool 22-150-03

SPK18P/1000 Plenum 1000 feet (300 m) spool 22-153-03

MPA 401-70V and MPA 401-100V • Parts and Accessories 13

Mounting

This section outlines the various mounting options available for the MPA 401 series
amplifiers:

z Plenum Placement

z Tabletop Placement

z Rack Mounting

z Under-desk Mounting

z Through-desk Mounting

z Projector Mounting

Plenum Placement

The MPA 401-70V and MPA 401-100V amplifiers meets UL 2043 requirements for heat
and smoke release. They can be installed in the ceiling, out of sight, with reduced risk of
theft.

CAUTION: Although the amplifier is plenum rated, the power supply provided with it

Tabletop Placement

Attach the four provided rubber feet to the bottom of the unit and place it in any
convenient location.

is not. The power supply must not be placed in the plenum space. Cables
to and from the amplifier must also be plenum rated.

MPA 401-70V and MPA 401-100V • Mounting 14

Rack Mounting

UL Guidelines For Rack Mounting

The following Underwriters Laboratories (UL) guidelines are relevant to the safe installation
of these products in a rack:

1. Elevated operating ambient temperature — If the unit is installed in a closed or

multi-unit rack assembly, the operating ambient temperature of the rack environment
may be greater than room ambient temperature. Therefore, install the equipment in
an environment compatible with the maximum ambient temperature (Tma: +122 °F,
+50 °C) specified by Extron.

2. Reduced air ow — Install the equipment in the rack so that the equipment gets

adequate air flow for safe operation.

3. Mechanical loading — Mount the equipment in the rack so that uneven mechanical

loading does not create a hazardous condition.

4. Circuit overloading — Connect the equipment to the supply circuit and consider the

effect that circuit overloading might have on overcurrent protection and supply wiring.
Appropriate consideration of the equipment nameplate ratings should be used when
addressing this concern.

5. Reliable earthing (grounding) — Maintain reliable grounding of rack-mounted

equipment. Pay particular attention to supply connections other than direct
connections to the branch circuit (such as the use of power strips).

CAUTION: Use only the two holes indicated in figure 7 for mounting the MPA 401.

The other four holes anchor stand-offs for the internal circuit boards;
using them may damage the amplifier and will not provide secure
mounting for the unit.

#4-40 Thread Thru
Rack Mounting

#4-40 Thread Thru
Rack Mounting

Figure 7. Points for Securing the Base of the MPA 401 to a Rack

MPA 401-70V and MPA 401-100V • Mounting 15

Rack Mounting Procedure

The unit can be mounted on any of these optional Extron rack systems:

z RSU 126: 6 inch deep, 1U rack shelf kit (part number 60-190-10)

z RSB 126: 6 inch deep, 1U basic rack shelf (part number 60-604-11)

z RSU 129: 9.5 inch deep, 1U rack shelf kit (part number 60-190-01)

z RSB 129: 9.5 inch deep, 1U basic rack shelf (part number 60-604-02)

To mount the amplifier on a rack shelf, follow the instructions provided with the shelf
accessories.

Under-desk Mounting

Mount the unit under a desk or podium, using the optional Extron MBU 125 under-desk
mounting kit (part number 70-077-01) by following the instructions provided with the kit.

Through-desk Mounting

Mount the unit through a desk or podium using the optional Extron MBD 129 through
desk mounting kit (part number 70-077-02) by following the instructions provided with
the kit.

Projector Mounting

The amplifier can be mounted above a projector using the optional PMK 350 Pole mount
kit (part number 70-563-03). Follow the instructions provided with each kit.

MPA 401-70V and MPA 401-100V • Mounting 16

Extron® Warranty

Extron Electronics warrants this product against defects in materials and workmanship for a period of
three years from the date of purchase; touchscreen display and overlay components are covered for 1
year. In the event of malfunction during the warranty period attributable directly to faulty workmanship
and/or materials, Extron Electronics will, at its option, repair or replace said products or components, to
whatever extent it shall deem necessary to restore said product to proper operating condition, provided
that it is returned within the warranty period, with proof of purchase and description of malfunction to:

USA, Canada, South America,
and Central America:

Extron Electronics
1001 East Ball Road
Anaheim, CA 92805
U.S.A.

Europe, Africa, and the Middle East:
Extron Europe
Hanzeboulevard 10
3825 PH Amersfoort
The Netherlands

Asia:
Extron Asia
135 Joo Seng Road, #04-01
PM Industrial Bldg.
Singapore 368363
Singapore

This Limited Warranty does not apply if the fault has been caused by misuse, improper handling care,
electrical or mechanical abuse, abnormal operating conditions, or modifications made to the product that
were not authorized by Extron.

Japan:
Extron Electronics, Japan
Kyodo Building, 16 Ichibancho
Chiyoda-ku, Tokyo 102-0082
Japan

China:
Extron China
686 Ronghua Road
Songjiang District
Shanghai 201611
China

Middle East:
Extron Middle East
Dubai Airport Free Zone
F12, PO Box 293666
United Arab Emirates, Dubai

NOTE: If a product is defective, please call Extron and ask for an Application Engineer to receive an RA

(Return Authorization) number. This will begin the repair process.

USA: [phone] Europe: +31.33.453.4040
Asia: +65.6383.4400 Japan: +81.3.3511.7655

Units must be returned insured, with shipping charges prepaid. If not insured, you assume the risk of
loss or damage during shipment. Returned units must include the serial number and a description of the
problem, as well as the name of the person to contact in case there are any questions.

Extron Electronics makes no further warranties either expressed or implied with respect to the product
and its quality, performance, merchantability, or fitness for any particular use. In no event will Extron
Electronics be liable for direct, indirect, or consequential damages resulting from any defect in this
product even if Extron Electronics has been advised of such damage.

Please note that laws vary from state to state and country to country, and that some provisions of this
warranty may not apply to you.

Extron USA - West

Extron USA - East

Extron Europe

Headquarters

+800.633.9876

Inside USA/Canada Only

+1.714.491.1500
+1.714.491.1517 FAX

+800.633.9876

Inside USA/Canada Only

+1.919.863.1794
+1.919.863.1797 FAX

+800.3987.6673

Inside Europe Only

+31.33.453.4040
+31.33.453.4050 FAX

© 2010 Extron Electronics All rights reserved. www.extron.com

Extron Asia

+800.7339.8766

Inside Asia Only

+65.6383.4400
+65.6383.4664 FAX

Extron Japan

+81.3.3511.7655
+81.3.3511.7656 FAX

Extron China

+400.883.1568

Inside China Only

+86.21.3760.1568
+86.21.3760.1566 FAX

Extron Middle East

+971.4.2991800
+971.4.2991880 FAX