Extron electronics MPA 401-70V User Manual

MPA 401-70V

Mini Power Amplifier

User Manual

Audio

68-1436-01 Rev. B

03 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’s 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 fixation • 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

Dies es Symbol soll dem Benut zer in der im Liefer umfang ent haltenen
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
manufacturer’s instructions.

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 orifices • 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 qualifiziertem 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 empfindlichen 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 calificado. 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:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

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

connected.

• 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 complete safety information about these products please read the Safety Compliances sheet, which is
available online at www.extron.com

Copyright

© 2010 Extron Electronics. All rights reserved.

Trademarks

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

Contents

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

MPA 401-70V Description

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

Rear Panel and Cabling .......................... 4

Rear Panel Cabling

Power Input ................................................... 5

Audio Inputs .................................................. 6

Remote Input Connector .............................. 7

Speaker Connections..................................... 7

........................................ 4

Setup and Operation .............................. 8

Front Panel Features ..................................... 8

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

Setting Bass and Treble ................................. 9

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

............................. 1

Reference Information ..........................10

Specifications ............................................... 10

Included Parts .............................................. 13

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 • Contents v

MPA 401-70V • Contents vi

Introduction

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

The following symbols are used throughout the manual and carry the following meanings:

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 that might damage the equipment.

WARNING: A Warning warns of things that might cause injury, death, or other severe

consequences.

MPA 401-70V Description

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

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

It features high efficiency, advanced 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 amplifier to be fanless and operate
in environments with little or no ventilation. The MPA 401-70V meets UL 2043 for smoke
and fire code for above-the-ceiling installations.

MPA 401-70V • Introduction 1

Ext ron

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

Ext ron
DVS 30 4 DVI AD

Digit al Vide o
Scale r
w/ Audio

R

3

L

INPUTS

R
2

L

R

1

100-240V .3A

L

50/60 Hz

Audio

SI 3CT LP

Full-Range
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

OUTPUT

L R

AUDIO

R

4

L

Ext ron VC 50

Volume Controller

VOLUME

VC 50

Extron

RS-232

O

O

LAN

B

U

U

/B-Y

T

T

G

RESET

P

P

LINK

/Y

U

U

ACT

T

R

T

/R-Y

V

H/
HV

DBS RECEIVER

1

2

DISPLAY

OFF

3

ON

4

VOLUME

CONFIG

MLC 104 IP

Ext ron
MLC 104 IP P lus

Contro ller

Flat Panel
Display
(DVI)

MPA 401-70V Features

VCR
(Video)

DVD
(Compo nent)

DSS Receiver
(S-vid eo)

Lapto p
(RGB)

Figure 1. Typical Application for the MPA 401-70V

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 MPA 401-70V meets UL 2043 for smoke and heat
release for installation within a plenum airspace above a drop ceiling. Above-the­ceiling 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 — The MPA 401-70V amplifier
accepts 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 MPA 401-70V amplifier mixes 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

qualified amplifier and energy efficient product that conserves energy and reduces costs.

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

®

qualified amplifier — The MPA 401-70V amplifier is an ENERGY STAR

MPA 401-70V • Introduction 2

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

Fanless design — The MPA 401-70V does 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 MPA 401-70V to be remotely
controlled using the optional Extron VCM 100 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.

External universal power supply included (part # 70-725-01) — provides worldwide
power compatibility.

CAUTION: See the caution on page 5 for very important information about power

supplies.

MPA 401-70V • Introduction 3

Rear Panel and
Cabling

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

• Rear Panel Cabling

• Power

• Audio Inputs

• Remote Input Connector

• Speaker Connections

Rear Panel Cabling

The illustration below shows the rear panel of the MPA 401-70V:

INPUTS

(MONO)

L

POWER

R

12V

1.5 A MAX

1 5

2

®

US

LISTED

AUDIO/VIDEO

APPARATUS

17TT

R

L (MONO)

3

4

CLASS 2 WIRING

DO NOT GROUND

OR SHORT

SPEAKER OUTPUTS!

10V 50mA

REMOTE

VOL/MUTE

MPA 401-70V

OUTPUT

70V

6

Figure 2. MPA 401-70V Rear Panel Features

MPA 401-70V • Rear Panel and Cabling 4

Power Input

Power connector — Connect the two pole, 3.5 mm captive screw connector from

a

the 12 VDC, 1 A external power supply (provided) to this socket on the rear panel.
Ensure the connections have the correct polarity as shown below:

12V

1.5 A MAX

3/16"

(5 mm) Max.

POWER

12V

1.5 A MAX

Power Receptacle

DC Power Cord
Captive Screw Connector

Ground
+12 VDC

Smooth

Power Supply

Output Cord

AC Power Cord

Ridges

A A

SECTION A–A

External

Power Supply

(12 VDC, 5 A )

Figure 3. Power Connection

NOTE: 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
loose over time.

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.

MPA 401-70V • Rear Panel and Cabling 5

Audio Inputs

INPUTS

RCA input connectors — These connectors accept

b

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).

(MONO)

L

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

3.5 mm stereo input — This input also accepts

c

R

L (MONO)

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.

Balanced or unbalanced audio input connector — This 5-pole 3.5 mm captive

d

screw connector accepts line level, balanced or unbalanced, mono or stereo audio
signals. See the notes on page 5 for important information about connecting wires
to captive screw connectors.

Tip

Sleeve

Tip

Sleeve

Unbalanced Stereo Input

(high impedance)

Tip

Sleeve

Unbalanced Mono Input

L (MONO) R

L (MONO) R

Tip

Ring

Sleeve (s)

Tip

Ring

Balanced Stereo Input

(high impedance)

Tip

Ring

Sleeve

Balanced Mono Input

L (MONO) R L (MONO) R

R

MPA 401-70V • Rear Panel and Cabling 6

Remote Input Connector

Remote input connector — This 3-pole captive screw connector allows the option

e

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 5 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:

о Pin 1 is 10 VDC reference voltage.

о Pin 2 (VOL/MUTE) has two functions:

• 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.

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

is shorted to ground.

о Pin 3 is ground.

Volume Pot
10K Ohms

2K

Mute
Switch

10 V

Vol/Mute

GND

Speaker Connections

NOTE: All nominal levels are at ± 10%

More information about remote control of the MPA 401-70V can be found on page 9.

Speaker connection — Connect the speakers to this socket using the 2-pole, 5 mm

f

screw-lock captive screw connector.

OUTPUT

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

70V

summed to form a Right Sum. Left Sum and Right Sum are mixed
and amplified to provide one high voltage, mono output, which provides up to 40 W
for a 70 V line distributed sound system.

See the notes on page 5 for important information about connecting wires to
captive screw connectors.

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

this will damage the amplifier.

MPA 401-70V • Rear Panel and Cabling 7

Setup and

BASSLEVEL TREBLE

Operation

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

• Front Panel Features

• Setting Input Level

• Setting Bass and Treble

• Remote Control Options

Front Panel Features

The illustration below shows the front panel of the MPA 401-70V.

2

1

a

b

Setting Input Level

Adjust the MPA 401-70V input level as follows:

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

2. If connecting the amplifier to a system with

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

4. Slowly increase the MPA 401-70V level until sound distortion starts to occur. Lower

BASSLEVEL TREBLE

MPA 401

MINI POWER AMPLIFIER

Figure 4. MPA 401-70V Front Panel

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.

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

bass, and treble settings. For further details, see below.

adjustable volume, set the volume to its lowest point.
Then adjust the MPA 401-70V level potentiometer
fully counterclockwise to its minimum setting.

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

MINI POWER AMPLIFIER

MPA 401

MPA 401-70V • Setup and Operation 8

Setting Bass and Treble

Extron

Adjust the MPA 401-70V bass and treble as follows:

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

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

Remote Control Options

100 Hz and below.

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.

SI 3CT LP

Full-Range
Ceiling Speaker s

VOLUME

VC 50

Extron

1

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

Extron VC 50

Volume Controller

RS-232

O

O

LAN

B

U

U

/B-Y

T

T

G

RESET

P

P

LINK

/Y

U

U

ACT

T

R

T

/R-Y

V

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

H/

R-Y
/C

HV

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

R

3

L

INPUTS

2

L R

R
1

100-240V .3A

L

50/60 Hz

Audio

1

2

DISPLAY

OFF

3

ON

4

Ext ron

CONFIG

MLC 104 IP

2

MLC 104 IP P lus

Contro ller

Flat Panel
Display
(DVI)

VOLUME

Figure 5. MPA 401-70V Remote Control Options

1. Extron VCM 50 volume and mute control — For a system designed to control the

MPA 401-70V volume directly, use a 10k Ohm potentiometer to control volume via
the remote port on the amplifier. Follow the instructions in the product manual.

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

the audio output to 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 manual.

VCR
(Video)

DBS RECEIVER

DVD
(Component)

DSS Receiver
(S-video)

Laptop
(RGB)

MPA 401-70V • Setup and Operation 9

Reference
Information

This section provides information about:

• Specifications

• Included Parts

• Optional Accessories

Specifications

Audio

Voltage gain

RCA and TRS inputs

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

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

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

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

................... 222x (47 dB)

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

Impedance

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

Input sensitivity

RCA and TRS inputs

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

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

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

(1) 3.5 mm mini audio jack (tip, ring, sleeve [TRS])
1 pair RCA

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

RCA/TRS) at 1% THD+N

................... -10 dBV (One input driven), -16dBV (Both inputs are summed)

-2 dBu if both inputs are summed

MPA 401-70V • Reference Information 10

Audio output

Number/signal type ....................... 1 single channel (mono) 70 V

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

Load impedance ........................... 125 ohms minimum

Frequency response ...................... 80 Hz to 20 kHz, ±3 dB, 1 watt

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

S/N ............................................... >75 dB @ 20 Hz to 20 kHz

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

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

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

Output power ............................... 40 watts (rms), 70 V, 1 kHz, 1% THD

Control/remote — amplifier

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, 5 A

(max.), regulated
Power input requirements

Power draw requirements ............. For amplifier and external power suppply

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

Temperature/humidity

Cooling
Thermal dissipation
Standby

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

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

Mounting
Rack mount

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)

Product weight

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

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

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

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

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

............................. 0.6 lbs (0.3 kg)

............. 12 VDC, up to 5 A

minutes] with no signal)

................... 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

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

(Depth excludes connectors.)

MPA 401-70V • Reference Information 11

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

Environmental .............................. Complies with the appropriate requirements of CEC, ENERGY

MTBF

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

................................... CE, C-tick, FCC Class B, ICES Class B, VCCI

STAR® (ENERGY STAR® qualified amplifier), EU code of

conduct, RoHS, WEEE

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

NOTE: All nominal levels are at ±10%.

Specifications are subject to change without notice.

MPA 401-70V • Reference Information 12

Included Parts

Optional Accessories

Description Part Number

MPA 401-70V 60-845-01

External 12 VDC, 5 A power supply

IEC power cord

(1) 2-pole 5 mm terminal block plug

(1) 5-pin 3.5 mm captive screw plug

(1) 3-pin 3.5 mm captive screw plug

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

Tweeker (small screwdriver)

MPA 401-70V Setup Guide

Description Part Number

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

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

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

RSB 129 1U, 9.5" 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

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

SI 3CT LP Ceiling speakers 42-103-03

SI 26 CT Ceiling speakers 42-070-03

FF 120 T Ceiling speakers 42-120-13

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

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

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

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

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

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

MPA 401-70V • Reference Information 13

Mounting

This section outlines the various mounting options available for the MPA 401-70V:

• Plenum Placement

• Tabletop Placement

• Rack Mounting

• Under-desk Mounting

• Through-desk Mounting

• Projector Mounting

Plenum Placement

The MPA 401-70V amplifier meets UL 2043 requirements for heat and smoke release. It
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 • 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 flow — 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 the diagram below 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

MPA 401-70V • Mounting 15

Rack Mounting Procedure

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

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

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

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

• RSB 129: 9.5 inch deep, 1U basic rack shelf (part #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 #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 #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 #70-563-03). Follow the instructions provided with each kit.

MPA 401-70V • 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. 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.

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

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 a modification to the product that was
not authorized by Extron.

If it has been determined that the product is defective, please call Extron and ask for an Applications Engineer at

• 714.491.1500 (USA),

• 31.33.453.4040 (Europe),

• 65.383.4400 (Asia), or

• 81.3.3511.7655 (Japan)

to receive an RA# (Return Authorization number). This will begin the repair process as quickly as possible.

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

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

Headquarters

+80 0.63 3.9 876

Inside USA / Canada Only

+1.714.491.1500
+1.714.491.1517 FAX

Extron USA - East

+80 0.63 3.9 876

Inside USA / Canada Only

+1.919.863 .1794
+1.919.863 .1797 FAX

Extron EMEA

+80 0.39 87.667 3

Inside Europe Only

+31.33 .45 3.40 40
+31.33 .45 3.40 50 FA X

Extron Asia

+80 0.733 9.87 66

Inside Asia Only

+65. 638 3.4 400
+65. 638 3.4 664 FAX

Extron Japan

+81.3. 3511.7655
+81.3. 3511.7656 F AX

Extron China

+40 0.88 3.1568

Inside China Only

+86. 21.37 60.1568
+86. 21.37 60.1566 FAX

Extron Middle East

+971.4 .29 9180 0
+971.4 .29 9188 0 FAX

Installation Checklist

Select a suitable location and mount the amplifier (see “Mounting”).

 Connect the audio input(s) (see page 6).

 Connect the speakers (see page 7).

 Connect the remote input device (see page 7).

 Connect the power supply (see page 5).

CAUTION: See the caution on page 5 for very important information about power

supplies.

 Adjust the input level (see page 8).

 Adjust the Bass and Treble (see page 9).

 Set up the remote control volume and mute options (see page 9).

© 2010 Extron Electronics. All rights reserved.