Extron electronic MPA 401-70V User Manual

MPA 401-70V

Mini Power Amplifier

68-1436-01

Rev. A

01 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.

N
N

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

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 accordance with the
manufacturer’s instructions.

8) Do not install near any heat sources such as radiators, heat registers, stoves, or
other apparatus (including amplifiers) that produce heat.

9) Do not defeat the safety purpose of the polarized or grounding-type plug. A
polarized plug has two blades with one wider than the other. A grounding
type plug has two blades and a third grounding prong. The wide blade or the
third prong are 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 apparatus.

11) Only use attachments/accessories specified by the manufacturer.

12) Use only with the cart, stand, tripod, bracket, or table specified by

the manufacturer, or sold with the apparatus. When a cart is used,
use caution when moving the cart/apparatus combination to avoid
injury from tip-over.

13) Unplug this apparatus during lightning storms or when unused for long
periods of time.

14) Refer all servicing to qualified service personnel. Servicing is required when
the apparatus has been damaged in any way, such as power-supply cord
or plug is damaged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped.

Table of Contents

Chapter One • Introduction .......................................................................................................1-1

About this Manual ..................................................................................................................... 1-2

MPA 401-70V Description ......................................................................................................1-2

MPA 401-70V Features .............................................................................................................1-3

Chapter Two • Cabling ...................................................................................................................2-1

Rear Panel Cabling ....................................................................................................................2-2

Chapter Three • Setup and Operation ............................................................................... 3-1

Front Panel Features ................................................................................................................3-2

Setting Input Level .................................................................................................................... 3-2

Setting Bass and Treble ..........................................................................................................3-2

Remote Control Options ........................................................................................................ 3-3

Appendix A • Specifications, Part Numbers, Accessories ................................ A-1

Specifications .............................................................................................................................. A-2

Part Numbers and Accessories .......................................................................................... A-4

Included parts ........................................................................................................................... A-4

Optional parts ........................................................................................................................... A-4

Appendix B • Mounting ................................................................................................................B-1

Plenum Placement .....................................................................................................................B-2

Tabletop Placement...................................................................................................................B-2

Rack Mounting .............................................................................................................................B-2

UL guidelines for rack mounting ............................................................................................B-2

Rack mounting procedure .......................................................................................................B-3

Under-desk Mounting ..............................................................................................................B-3

Through-desk Mounting ........................................................................................................B-3

Pole Mounting ..............................................................................................................................B-3

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

MPA 401-70V • Table of Contents

68-1436-01

Rev. A

01 10

i

Table of Contents, cont’d

ii

MPA 401-70V • Table of Contents

MPA 401-70V

Chapter One

1

Introduction

About This Manual

MPA 401-70V Description

MPA 401-70V Features

Introduction

Extron

About this Manual

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:

N
T
C
W

A Note icon draws attention to important information.

A Tip provides a suggestion to make setting up or working with the device easier.

A Caution icon warns of things that might damage the equipment.

A Warning icon 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

Extron
MPA 401

Mini Power
Amplier

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 high­impedance, 70 V distributed sound system.

Front panel controls allow easy adjustment of bass and treble volume and input
level. 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.

SI 3CT LP

Full-Range

Extron
DVS 30 4 DVI AD

Digital Video
Scaler
w/ Audio

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

1.5A MAX

O

O

B

U

U

/B-Y

T

T

G

RESET

P

P

/Y

U

U

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

OUTPUT

L R

AUDIO

R

4

L

R

3

L

INPUTS

R

2

L

R

1

100-240V .3A

L

50/60 Hz

Audio

VOLUME

VC 50

Extron

RS-232

LAN

LINK

ACT

Extron VC 50

Volume Controller

1

2

DISPLAY

OFF

3

ON

4

VOLUME

CONFIG

MLC 104 IP

Ext ron
MLC 104 IP Plus

Controller

Flat Panel
Display
(DVI)

1-2

MPA 401-70V • Introduction

VCR
(Video)

DVD
(Component)

DSS Receiver
(S-video)

DBS RECEIVER

Laptop
(RGB)

MPA 401-70V 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 MPA 401-70V meets UL 2043 for smoke and heat

release for installation within a plenum airspace above a drop ceiling. Above­the-ceiling placement conceals the amplifier to prevent theft and is convenient
for installing equipment when space inside the room is limited.

C

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.

N

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

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.

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 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 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" deep metal enclosure, offers

flexible mounting options.

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

worldwide power compatibility.

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

is not. The power supply must not be placed in the plenum space. If the
amplifier is placed in a plenum space, all cables to and from it must also be
plenum rated.

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.

®

Qualified Amplifier — The MPA 401-70V amplifier is an

MPA 401-70V • Introduction

1-3

Introduction

1-4

MPA 401-70V • Introduction

MPA 401-70V

Chapter Two

2

Cabling

Rear Panel Cabling

Cabling

INPUTS

Rear Panel Cabling

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

POWER

12V

1.5 A MAX

L

R

INPUTS

(MONO)

®

LISTED

AUDIO/VIDEO

APPARATUS

17TT

L (MONO)

CLASS 2 WIRING

US

DO NOT GROUND

OR SHORT

SPEAKER OUTPUTS!

10V 50mA

REMOTE

R

VOL/MUTE

MPA 401-70V

OUTPUT

70V

3

1 5

2

4

6

MPA 401-70V Rear Panel Features

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

a

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:

POWER

12V

1.5 A MAX

N

Power Receptacle

DC Power Cord
Captive Screw Connector

Ground
+12 VDC

AC Power Cord

Smooth

Power Supply

Output Cord

Power Supply

(12 VDC, 5 A )

Ridges

External

A A

SECTION A–A

3/16”

(5 mm) Max.

1.5 A MAX
12V

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.

N

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

over time.

2-2

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).

If unused, the connectors automatically terminate to



lower the noise floor.

3.5 mm stereo input — This input also accepts

c

unbalanced, line level audio signals through a 3.5 mm

tip ring sleeve (TRS) stereo jack.

lower the noise floor.

MPA 401-70V • Cabling

(MONO)

L

R

L (MONO)

R

If unused, the connector automatically terminates to

10V 50m

A

OUTPUT

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 2-2 for important information about connecting

wires to captive screw connectors.

C

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

e

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 2-2 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
and instructions below:

• Pin 1 is 10 VDC reference voltage.

• Pin 2 (VOL/MUTE) has two functions:

o It can be used as a variable voltage input.

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

• Pin 3 is ground.

N

More information about remote control of the MPA 401-70V can be found on page 3-3.

Connect the input wires to the correct terminal. Connecting the ground

wire ( ) to a negative (-) terminal will damage the audio output circuits.

2K

Mute
Switch

The volume control DC voltage range is

Volume Pot
10K Ohms

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

pin is shorted to ground.

All nominal levels are at ± 10%

VOL/MUTE

REMOTE

10 V

Vol/Mute

GND

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

f

screw-lock captive screw connector.
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, which provides up to 40 W for a 70 V line distributed sound system.

See the notes on page 2-2 for important information about connecting wires to
captive screw connectors.

C

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

will damage the amplifier.

70V

MPA 401-70V • Cabling

2-3

Cabling, cont’d

2-4

MPA 401-70V • Cabling

MPA 401-70V

Chapter Three

3

Setup and Operation

Front Panel Features

Setting Input Level

Setting Bass and Treble

Remote Control Options

Setup and Operation

BASSLEVEL TREBLE

Front Panel Features

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

2

BASSLEVEL TREBLE

1

MPA 401

MINI POWER AMPLIFIER

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

a

Potentiometers — These three front panel potentiometers are used to optimize

b

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

Setting Input Level

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

1.

If necessary, unplug the remote plug from the

unit.

If connecting the amplifier to a system

2.

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

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

3.

4. Slowly increase the MPA 401-70V 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.

MINI POWER AMPLIFIER

MPA 401

Setting Bass and Treble

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

100 Hz and below.

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

2.

at 10 kHz and above.

N

Turning the bass or treble potentiometers counter clockwise 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.

3-2

MPA 401-70V • Setup and Operation

Extron

ol/Mute

Remote Control Options

Extron
MPA 401

Mini Power

SI 3CT LP

Full-Range
Ceiling Speaker s

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

SDI

I

I

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

Extron
DVS 304 DVI AD

Digital Video
Scaler

L

50/60 Hz

Audio

w/ Audio

VCR
(Video)

Extron VCM 50 volume and mute control —

a

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

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

Y

4

/VID

YC

3

G
/Y

R
/R-Y

V

H/
HV

DVI-I

VOLUME

VC 50

Extron

1

Extron VC 50

Volume Controller

RS-232

O

O

LAN

B

U

U

/B-Y

T

T

RESET

P

P

LINK

U

U

ACT

T

T

DVD
(Component)

DSS Receiver
(S-video)

Volume Pot
10K Ohms

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)

Laptop
(RGB)

VOLUME

DBS RECEIVER

10 V

2K

Mute
Switch

V

GND

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

b

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

MPA 401-70V • Setup and Operation

3-3

Setup and Operation, cont’d

3-4

MPA 401-70V • Setup and Operation

MPA 401-70V

Appendix A

A

Specifications, Part Numbers,

Accessories

Specifications

Part Numbers and Accessories

Specifications, Part Numbers, Accessories

Specifications

Audio

Voltage gain

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

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

Impedance

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

Input sensitivity

..................................... (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

1% THD+N

RCA and TRS inputs

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

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

-2 dBu if both inputs are summed

N

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

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)

A-2

MPA 401-70V • Specifications, Part Numbers, Accessories

General

External power supply ................. 100 VAC to 240 VAC, 50-60 Hz, external; to 12 VDC, 5 A (max.), regulated

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

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 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 ................... Complies with the appropriate requirements of CEC, ENERGY STAR®

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

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

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

N

N

All nominal levels are at ±10%

Specifications are subject to change without notice.

MPA 401-70V • Specifications, Part Numbers, Accessories

A-3

Specifications, Part Numbers, Accessories, cont’d

Part Numbers and Accessories

Included parts

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
(2) Velcro tape roll
Tweeker (small screwdriver)

MPA 401-70V Setup Guide

Optional parts

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 100 Pole mount kit 70-217-01
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
SPK18/1000 Non-Plenum 1000' (300 m) spool 22-150-03
SPK18P/1000 Plenum 1000' (300 m) spool 22-153-03
SPK 18 Pre-cut speaker cable 25' (7.6 m) 26-627-25
SPK 18 Pre-cut speaker cable 35' (10.6 m) 26-627-35
SPK 18 Pre-cut speaker cable 50' (15.2 m) 26-627-50
SPK 18 Pre-cut speaker cable 100' (30.4 m) 26-627-100

A-4

MPA 401-70V • Specifications, Part Numbers, Accessories

MPA 401-70V

Appendix B

B

Mounting

Plenum Placement

Tabletop Placement

Rack Mounting

Under-desk Mounting

Through-desk Mounting

Pole Mounting

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.

C

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

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

Tabletop Placement

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

Rack Mounting

UL guidelines for rack mounting

The following Underwriters Laboratories (UL) guidelines are relevant to the safe
installation of this product 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).

B-2

MPA 401-70V • Mounting

Rack mounting procedure

The unit can be mounted on any of these optional rack systems:
RSU 126 — 6" deep 1U universal rack shelf kit (part # 60-190-10)
RSB 126 — 6" deep 1U basic rack shelf (part # 60-604-11)
RSU 129 — 9.5" deep 1U universal rack shelf kit (part # 60-190-01)
RSB 129 — 9.5" deep 1U basic rack shelf (part # 60-604-02)
To mount the scaler on a rack shelf, follow the instructions provided with the shelf

accessories.

C

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.

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 MBU 125 kit.

#4-40 Thread Thru
Rack Mounting

#4-40 Thread Thru
Rack Mounting

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 MBD 129 kit.

Pole Mounting

The amplifier can be mounted above a projector using either of these optional
Extron Pole Mounting Kits:

• PMK 100 Pole mount kit (part # 70-217-01)

• PMK 350 Pole mount kit (part # 70-563-03)
Follow the instructions provided with each kit.

MPA 401-70V • Mounting

B-3

Mounting, cont’d

B-4

MPA 401-70V • Mounting

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 has not been authorized by Extron.

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

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.

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

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 3.98 76

Inside USA / Canada Only

+1.714.491.1500
+1.714.491.1517 FAX

Extron USA - East

+80 0.63 3.98 76

Inside USA / Canada Only

+1.919.863.1794
+1.919.863.1797 FA X

Extron Europe

+80 0.39 87.6673

Inside Europe Only

+31.33. 453 .404 0
+31.33. 453 .405 0 FAX

Extron Asia

+80 0.7339 .876 6

Inside Asia Only

+65.6 38 3.44 00
+65.6 38 3.46 64 FA X

Extron Japan

+81.3.3 511.7655
+81.3.3 511.7656 FA X

Extron China

+40 0.88 3.1568

Inside China Only

+86. 21.376 0.1568
+86. 21.376 0.1566 FA X

Extron Middle East

+971.4. 299 1800
+971.4. 299 1880 FA X

Installation Checklist

 Select a suitable location and mount the amplifier (see appendix B).
 Connect the audio input(s) (see pages 2-2 and 2-3).
 Connect the speakers (see page 2-3).
 Connect the remote input device (see page 2-3).
 Connect the power supply (see page 2-2).
 Adjust the input level (see page 3-2).
 Adjust the Bass and Treble (see page 3-2).
 Set up the remote control volume and mute options (see page 3-3).

© 2010 Extron Electronics. All rights reserved.