Extron electronics MPA 152 MD User Manual

MPA 152 MD

Mini Power Amplifier

User Guide

Audio

68-1989-01 Rev. A

11 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:

• 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 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 152 MD Application Notes ....................... 1

About the MPA 152 MD .................................. 2

Features ........................................................... 2

Panels and Cabling ................................. 3

MPA 152 MD Rear Panel Features .................... 3

Power .......................................................... 3

Audio Inputs ................................................ 4

Remote Control ........................................... 5

Audio Output .............................................. 7

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

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

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

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

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

Preventative Inspection and Maintenance ....... 10

Specications .........................................11

Symbols Used in the Specifications ................. 12

Included Parts and

Optional Accessories .............................

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

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

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

13

MPA 152 MD • Contents v

MPA 152 MD • Contents vi

Introduction

This guide contains information about the Extron MPA 152 MD mini power amplifier
with instructions for experienced installers on how to install, configure, and operate the
equipment. Unless otherwise specified, references in this guide to the “amplifier” or “MPA”
relate to the features or operation of the MPA 152 MD.

This section includes the MPA 152 MD Application Notes, describes the product, and
lists some of its features.

MPA 152 MD Application Notes

Modern medical systems are increasingly composed of devices that allow for both local and
remote communications in order to provide essential services such as medical data transfer
between doctors and other support medical personnel or medical instruction to medical
students in a medical environment. These systems of devices require that the accessories
used with them meet the medical safety standards of “UL 60601-1, Medical Electrical
Equipment, Part 1: General Requirements for Safety” when they are used in areas such as
an operating room, examination room, or any area where medical patients and medical
personnel are present.

The MPA 152 MD device is an accessory to medical equipment that falls under the scope of
“UL 60601-1, Clause 2.1.3”, since it qualifies as an optional component that can be deemed
necessary and suitable as part of medical equipment or with use as part of a medical system
to provide audio feeds in real time to those in the medical environments and in a remote
locations simultaneously. In this environment, the MPA 152 MD can be added to the system
ONLY if the connecting equipment has been evaluated with the equipment to meets the
“UL 60601-1” safety standards.

The MPA 152 MD is an accessory device that has been UL recognized to the safety
requirements of “UL 60601-1”. When connecting accessory equipment to any analog and
digital interfaces, it is mandatory that it complies with the IEC standard for which it is used:

 “IEC 60950” for data processing equipment

 “IEC 60065” for video equipment

 “IEC 61010-1” for laboratory equipment

 “IEC 60601-1” for medical equipment

The MPA 152 MD is not a standalone accessory, but it is rather a UL recognized component
that can be used as part of a medical system. It is intended for built-in systems.

Furthermore, all configurations used with this device must comply with the system standard
“IEC 60601-1”. For any additional equipment connected to the input or output of this
device in a medical system, it is the responsibility of the user that the system complies with
the requirements of the “IEC 60601-1-1” system standard. If there are any questions or
doubts, contact the Extron Support Department.

MPA 152 MD • Introduction 1

About the MPA 152 MD

THE MPA 152 MD IS AN ACCESSORY TO A MEDICAL SYSTEM.

The MPA 152 MD is a high performance, compact, power amplifier. It delivers up
to 15 watts (rms) per channel (stereo or dual mono) into a 4 ohm sound system or
8 watts (rms) per channel into an 8 ohm system.

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

Features

Class D digital audio amplier — For high efficiency and less heat production.

Ripple Steering technology — Produces cleaner, low-emission, audio output signals.

Fixed switching frequency — Switches at a frequency below the AM band, which reduces

the chance of radio interference.

Three audio inputs — Accepts 1 balanced or unbalanced input pair (captive screw) and 2
unbalanced pairs (RCA and TRS), providing up to three right and three left channel inputs.
All three right inputs are mixed to produce a single right output; all three left outputs are
mixed to produce a single left output.

Stereo/Dual Mono toggle switch — Allows the user to choose between stereo output or
to sum the left and right outputs and produce dual mono outputs.

Up to 15 watts (rms) per channel stereo output — Delivers up to
15 watts (rms) per channel (stereo or dual mono) into a 4 ohm speaker system or up to
8 watts (rms) per channel into an 8 ohm system.

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

Quick-plug speaker outputs — Speaker output is on a captive screw connector for quick

installation.

Volume and mute remote control — A rear panel, three-pin captive screw remote input
connector allows remote adjustment of volume and muting.

Always-on clip limiting — Reduces gain automatically to prevent amplifier clipping.

Compact size — The amplifiers are housed in a 1U high, quarter rack 3 inch deep, metal

enclosure.

MPA 152 MD • Introduction 2

Panels and
Cabling

This section discusses the MPA 152 MD rear panel features and cabling.

MPA 152 MD Rear Panel Features

The rear panel of the MPA 152 MD (shown in figure 1 below) allows the user to connect

power, audio input, speakers, and remote control.

Power

MPA 152 MD

C US

LISTED
17TT
AUDIO/VIDEO
APPARATUS

POWER

12V

3A MAX

1 2 3 654

L

SPEAKER OUTPUTS!

INPUTS

R

CLASS 2 WIRING

DO NOT GROUND

OR SHORT

L

OUTPUT

L

R

R

REMOTE

10V 50mA

4/8

OHMS

VOL/MUTE

Figure 1. MPA 152 MD Rear Panels Features

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

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

POWER

Power Receptacle

12V

3A MAX

Figure 2. Power Connector

DC Power Cord
Captive Screw Connector

Ground
+12 VDC

External

Power Supply

(12 VDC, 3 A )

MPA 152 MD • Panels and Cabling 3

Audio Inputs

INPUTS

Tip (+)

CAUTION: Always use a power supply supplied by 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.

L

Figure 3. Audio Inputs

R

L

R

b RCA input connectors — These two connectors (left

and right) accept 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 socket). If
unused, the connectors automatically terminate to lower
the noise floor.

c 3.5 mm stereo input — This connector accepts

unbalanced, line level audio signals. If unused, the
connector automatically terminates to lower the noise
floor.

Sleeve ( )

RCA Connector

Tip (L)

Ring (R)

Sleeve ( )

3.5 mm Stereo

Plug Connector

MPA 152 MD • Panels and Cabling 4

d Balanced or unbalanced audio input

REMOTE

REMOTE

OL/MUTE

LR

connector — This 5-pole, 3.5 mm captive screw
input accepts balanced or unbalanced, mono or
stereo, line level signals. See the note below for
important information about connecting wires to
captive screw connectors.

Tip

Ring

Sleeves

Tip

Ring

Tip

Sleeve

Tip

Sleeve

Balanced audio

Unbalanced audio

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.

The three left channel inputs (RCA, TRS, and captive screw) and three right channels are
mixed to provide a single left channel output. The three right channel inputs are mixed
to provide a single right channel output.

Depending on the position of the front panel toggle switch (see gure 6 on page 8),
the right and left channels may be output as a stereo signal, or summed and output as a
dual mono signal.

LR

Remote Control

e Remote input connector — This 3-pin, captive screw connector

allows the volume level and mute function to be controlled remotely.

Wiring for remote control

Third party 10k potentiometer volume controllers can also be connected
to this port. Wire the remote control connector to the MPA 152 MD
captive screw connector as shown in the figure and instructions below.

Volume Pot
10K Ohms

Figure 4. Remote Control Wiring

 Pin 1 is 10 V reference voltage.

 Pin 2 (Vol/Mute) has two functions:

V

10V50mA

10 V (Pin 1)

2K

Mute
Switch

 It can be used as a variable voltage input between 0 and 10 V , with 0 V giving full

Vol/Mute
(Pin 2)

GND (Pin 3)

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.

MPA 152 MD • Panels and Cabling 5

 Pin 3 is ground.

NOTE: All nominal levels are at ± 10%

Controlling multiple ampliers with one volume controller

Several MPA 152 MD units can be daisy-chained so that one volume controller can
simultaneously regulate the volume of all the amplifiers.

NOTE: As additional amplifiers are added to the daisy chain, the sensitivity of the

volume potentiometer will change. The maximum volume level (fully clockwise)
will not be affected. However, the effectiveness of the minimum volume level
(fully counterclockwise) in reducing the volume to inaudible levels decreases as
more amplifiers are added to the daisy chain.

When more than two MPAs are attached to the chain, sound may begin to be
heard even if the levels have been set to their lowest. The muting of the output
can be remedied with a contact closure button attached between the Vol/Mute
and ground pin of the first MPA in the chain.

To regulate multiple amplifiers with a single volume controller, follow these instructions:

1. Attach all three pins of the volume controller to the corresponding pins on the first

MPA 152 unit only (ground to ground; Vol/Mute to Vol/Mute; and 10 V to 10 V).

2. Use jumper wires to connect the Vol/Mute pins of the first and each successive amplifier.

3. Use jumper wires to connect the ground pins of the first and each successive amplifier.

VOL/MUTE

10V

Extron
VCM 100 AAP

Extron
MPA 152 MD
daisy chain

VOL/MUTE

50mA 10V

10V

VOL/MUTE

50mA10V

VOL/MUTE

50mA

Figure 5. Regulating Multiple Ampliers with a Single Volume Controller

CAUTION: If the MPA 152 MD is used in this configuration, it is the responsibility

of the user to ensure that the system complies with the requirements
of the IEC 60601-1-1 system standard. If there are any questions or
doubts, contact the Extron Support Department. For more information,
see the MPA 152 MD Application Notes on page 1.

NOTE: The 10V pin of the volume controller connects to the first MPA 152 MD

only. There are no jumper wires linking it to subsequent amplifiers.

MPA 152 MD • Panels and Cabling 6

Audio Output

OUTPUT

f Speaker connector — This 4-pole, 5 mm captive screw

connector is used to connect the amplifier to the speakers.

All right channel input signals are mixed and summed to
produce a single, right channel output; likewise, all left
channel input signals are mixed and summed to produce a
single, left channel output.

If the front panel switch (see gure 6 on page 8) is set to stereo, the output will be
stereo; if the front panel switch is set to dual mono, the right and left channels will be
mixed and summed for a dual mono output.

With an 8 ohm load, the amplifier produces up to 8 watts per channel. With a 4 ohm
load, the amplifier produces up to 15 watts per channel.

See the caution on page 4 and note on page 5 for important information about
connecting wires to captive screw connectors.

CAUTION: Do not short the + and - outputs to each other, as this will damage the

amplifier.

LR

4/8

OHMS

MPA 152 MD • Panels and Cabling 7

Setup and
Operation

Front Panel Features

This section describes how to use the controls on the MPA 152 MD front panel (shown in
figure 6 below) to configure the amplifier and how to set up the remote control options.

1

Figure 6. MPA 152 MD Front Panel

a Power LED — The LED is lit when the unit receives power.
b Stereo/Dual Mono toggle switch — Allows the user to choose between stereo

output for stereo program speakers or dual mono output for mono ceiling speakers

c Potentiometers — Three front panel potentiometers are used to optimize level, bass,

and treble settings.

Setting Input Level

Adjust the MPA 152 MD input level as follows:

1. Unplug the remote plug from the unit.

2. Turn the Level potentiometer fully counterclockwise to its minimum setting.

3. Set the volume of the audio source to its maximum level. No sound should come out.

4. Slowly increase the MPA 152 MD level until sound distortion starts to occur. Lower the

level slightly until the distortion disappears. This setting will ensure that, whatever the
volume setting of the audio source, no clipping will occur.

STEREO

DUAL
MONO

2

BASSLEVEL TREBLE

MPA 152 MD

MINI POWER AMPLIFIER

3

MPA 152 MD • Setup and Operation 8

Setting Bass and Treble

Adjust the MPA 152 MD bass and treble as follows:

1. Use the Bass potentiometer to increase or decrease the bass shelving ±10 dB at 80 Hz

and below.

2. Use the Treble potentiometer to increase or decrease the bass 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 in the center, flat response is
achieved.

Remote Control Options

CAUTION: All accessory equipment must be UL-listed. For more information, see the

a Using the IR remote of a projector — When using a projector with variable audio

outputs, connect the projector audio output to the MPA 152 MD audio input. Use the
IR remote for the projector to control the volume of the projector, which effectively
controls the volume of the MPA 152 MD.

b Using third party volume and mute control — A third party remote control option

can be used with a projector that lacks variable audio outputs. There are a variety of
options for a projector without variable audio outputs, or for a system designed to
control the volume of the MPA 152 MD directly. See page 5 for more information about

Wiring for remote control.

MPA 152 MD Application Notes on page 1.

MPA 152 MD • Setup and Operation 9

Preventative Inspection and Maintenance

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 at least once every quarter.

7. Do not block any ventilation openings. Install in accordance with the instructions of the

manufacturer.

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. All accessory equipment must be UL-listed.

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. It is the responsibility of the user that the system complies with the requirements of

the IEC 60601-1-1 system standard. If there are any questions or doubts, consult the
technical services department or your local representative. For more information, see the

MPA 152 MD Application Notes on page 1.

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

15. 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.

MPA 152 MD • Setup and Operation 10

Specications

Audio

Voltage gain

Balanced .................................. 25x (28 dB)

Unbalanced ............................. 50x (34 dB)

Stereo channel separation .............. >60 dB @ 1 kHz

CMRR ............................................ 74 dB (typical) @ 1 kHz

Bass adjustment ............................. ±10 dB @ 80 Hz (reference) to 1 kHz (2 dB tolerance)

Treble adjustment ........................... ±10 dB @ 10 kHz (reference) to 1 kHz (2 dB tolerance)

Audio input

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

2 stereo, unbalanced inputs
(The three inputs are individually buffered and mixed together.)

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 unbalanced/balanced, DC coupled

Maximum level ............................... -3 dBV (unbalanced), +3 dBV (balanced) at 1% THD+N

Input sensitivity

Balanced .................................. -10 dBV

Unbalanced ............................. -16 dBV

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

Audio output

Number/signal type ........................ 1 stereo or 2 mono (2 channels total)

Connectors .................................... (1) 5 mm captive screw connector, 4 pole

Load impedance ............................. 4 ohms, minimum

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

Output power ................................ 8 watts rms per channel, 8 ohms, 1 kHz, 1% THD

15 watts rms per channel, 4 ohms, 1 kHz, 1% THD

Frequency response ........................ 20 Hz to 20 kHz, ±3 dB

THD + Noise ................................... 0.15% @ 1 kHz at nominal level (1 watt, 8 ohm load)

S/N ................................................. 74 dB at 20 Hz to 20 kHz (unweighted)

Damping factor .............................. >30 at 4 ohms

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 (variable voltage),

pin 3 = GND

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

MPA 152 MD • Specications 11

General

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

Power input requirements .............. 12 V

, up to 3 A

NOTE: To ensure compliance to UL60601-1, use only the power supply shipped with the unit.

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

Transport: -40 to +158 °F (-40 to +70 °C) / 10% to 90%, noncondensing

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

Mounting

CAUTION: All accessory equipment must be UL-listed.

It is the responsibility of the user to ensure that the system complies with the requirements of the
IEC 60601-1-1 system standard. If there are any questions or doubts, consult the technical services
department or your local representative. For more information, see the MPA 152 MD Application

Notes on page 2.

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

Enclosure dimensions ..................... 1.7" H x 4.3" W x 3.0" D (1U high, quarter rack wide)

(4.3 cm H x 10.9 cm W x 7.6 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

Meets UL 60601-1 for medical safety as a recognized component.

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

Environmental .......................... 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.

Symbols Used in the Specications

V~ AC units

+ DC positive voltages

- DC negative voltages

Earth ground

Direct Current

V Volts

A Amps

mA milliamps

MPA 152 MD • Specications 12

Included Parts
and Optional

Accessories

This section shows the parts that are provided with the MPA 152 MD and also lists the
optional accessories that are available from Extron.

Included Parts

Description Part Number

MPA 152 MD 43-186-01

External 12 VDC, 3 A power supply 70-380-01

IEC power cord

(1) 4-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

Extron Safety and Regulatory Compliance Guide

MPA 152 MD • Setup Guide

Optional Accessories

CAUTION: All accessory equipment must be UL-listed.

It is the responsibility of the user to ensure that the system complies with
the requirements of the IEC 60601-1-1 system standard. If there are any
questions or doubts, consult the Extron Service and Sales Department. For
more information, see the MPA 152 MD Application Notes on page 2.

MPA 152 MD • Included Parts and Optional Accessories 13

Mounting

The MPA 152 MD amplifier should be placed on a desk or tabletop. Attach the four provided
rubber feet to the bottom of the unit and place it in any convenient location.

MPA 152 MD • Mounting 14

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.

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 were 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.

Installation Checklist

 Select a suitable location and mount the amplifier (see page 14).

 Connect the audio inputs (see page 4).

 Connect the speakers (see page 7).

 Connect the remote control input device (see page 5).

 Connect the power supply (see page 3).

 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).

Extron USA - West

Headquarters

+800.633.9876
Inside USA/Canada
Only

+1.714.491.1500
+1.714.491.1517 FAX

Extron USA - East

+800.633.9876

Inside USA/Canada
Only

+1.919.863.1794
+1.919.863.1797 FAX

Extron Europe

+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