Extron MPA 152 Plus User Manual

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MPA 152 Plus

ENERGY STAR® Qualiﬁed Stereo Mini Power Ampliﬁer

User Guide

Audio

68-1320-03 Rev. C

12 20

Safety Instructions

Safety Instructions • English

WARNING: This symbol, , when used on the product, 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.

ATTENTION: This symbol, , when used on the product, is intended

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

For information on safety guidelines, regulatory compliances, EMI/EMF compatibility, accessibility, and related topics, see the Extron Safety and Regulatory Compliance Guide, part number 68-290-01, on the Extron website, www.extron.com.

Sicherheitsanweisungen • Deutsch

WARNUNG: Dieses Symbol auf dem Produkt soll den Benutzer darauf

aufmerksam machen, dass im Inneren des Gehäuses dieses Produktes gefährliche Spannungen herrschen, die nicht isoliert sind und die einen elektrischen Schlag verursachen können.

VORSICHT: Dieses Symbol auf dem Produkt soll dem Benutzer

in der im Lieferumfang enthaltenen Dokumentation besonders wichtige Hinweise zur Bedienung und Wartung (Instandhaltung) geben.

Weitere Informationen über die Sicherheitsrichtlinien, Produkthandhabung, EMI/EMF-Kompatibilität, Zugänglichkeit und verwandte Themen finden Sie in den Extron-Richtlinien für Sicherheit und Handhabung (Artikelnummer 68-290-01) auf der Extron-Website, www.extron.com.

Instrucciones de seguridad • Español

ADVERTENCIA: Este símbolo, , cuando se utiliza en el producto,

avisa al usuario de la presencia de voltaje peligroso sin aislar dentro del producto, lo que puede representar un riesgo de descarga eléctrica.

ATENCIÓN: Este símbolo, , cuando se utiliza en el producto,

avisa al usuario de la presencia de importantes instrucciones de uso y mantenimiento recogidas en la documentación proporcionada con el equipo.

Para obtener información sobre directrices de seguridad, cumplimiento de normativas, compatibilidad electromagnética, accesibilidad y temas relacionados, consulte la Guía de cumplimiento de normativas y seguridad de Extron, referencia 68-290-01, en el sitio Web de Extron,

www.extron.com.

Instructions de sécurité • Français

AVERTISSEMENT : Ce pictogramme, , lorsqu’il est utilisé sur le

produit, signale à l’utilisateur la présence à l’intérieur du boîtier du produit d’une tension électrique dangereuse susceptible de provoquer un choc électrique.

Istruzioni di sicurezza • Italiano

AVVERTENZA: Il simbolo, , se usato sul prodotto, serve ad

avvertire l’utente della presenza di tensione non isolata pericolosa all’interno del contenitore del prodotto che può costituire un rischio di scosse elettriche.

ATTENTZIONE: Il simbolo, , se usato sul prodotto, serve ad

avvertire l’utente della presenza di importanti istruzioni di funzionamento e manutenzione nella documentazione fornita con l’apparecchio.

Per informazioni su parametri di sicurezza, conformità alle normative, compatibilità EMI/EMF, accessibilità e argomenti simili, fare riferimento alla Guida alla conformità normativa e di sicurezza di Extron, cod. articolo 68-290-01, sul sito web di Extron, www.extron.com.

Instrukcje bezpieczeństwa • Polska

OSTRZEŻENIE: Ten symbol, , gdy używany na produkt, ma na celu

poinformować użytkownika o obecności izolowanego i niebezpiecznego napięcia wewnątrz obudowy produktu, który może stanowić zagrożenie porażenia prądem elektrycznym.

UWAGI: Ten symbol, , gdy używany na produkt, jest przeznaczony do

ostrzegania użytkownika ważne operacyjne oraz instrukcje konserwacji (obsługi) w literaturze, wyposażone w sprzęt.

Informacji na temat wytycznych w sprawie bezpieczeństwa, regulacji wzajemnej zgodności, zgodność EMI/EMF, dostępności i Tematy pokrewne, zobacz Extron bezpieczeństwa i regulacyjnego zgodności przewodnik, część numer 68-290-01, na stronie internetowej Extron, www.extron.com.

Инструкция по технике безопасности • Русский

ПРЕДУПРЕЖДЕНИЕ: Данный символ, , если указан на

продукте, предупреждает пользователя о наличии неизолированного опасного напряжения внутри корпуса продукта, которое может привести к поражению электрическим током.

ВНИМАНИЕ: Данный символ, , если указан на продукте,

предупреждает пользователя о наличии важных инструкций по эксплуатации и обслуживанию в руководстве, прилагаемом к данному оборудованию.

Для получения информации о правилах техники безопасности, соблюдении нормативных требований, электромагнитной совместимости (ЭМП/ЭДС), возможности доступа и других вопросах см. руководство по безопасности и соблюдению нормативных требований Extron на сайте Extron: ,

www.extron.com, номер по каталогу - 68-290-01.

安全说明 • 简体中文

警告：产品上的这个标志意在警告用户该产品机壳内有暴露的危险电压，

有触电危险。

ATTENTION : Ce pictogramme, , lorsqu’il est utilisé sur le produit,

signale à l’utilisateur des instructions d’utilisation ou de maintenance importantes qui se trouvent dans la documentation fournie avec le matériel.

Pour en savoir plus sur les règles de sécurité, la conformité à la réglementation, la compatibilité EMI/EMF, l’accessibilité, et autres sujets connexes, lisez les informations de sécurité et de conformité Extron, réf. 68-290-01, sur le site Extron, www.extron.com.

注意：产品上的这个标志意在提示用户设备随附的用户手册中有

重要的操作和维护(维修）说明。

关于我们产品的安全指南、遵循的规范、EMI/EMF 的兼容性、无障碍使用的特性等相关内容，敬请访问 Extron 网站 , www.extron.com，参见 Extron

安全规范指南，产品编号 68-290-01

。

安全記事 • 繁體中文

안전 지침 • 한국어

警告: 若產品上使用此符號，是為了提醒使用者，產品機殼內存在著

可能會導致觸電之風險的未絕緣危險電壓。

注意若產品上使用此符號，是為了提醒使用者，設備隨附的用戶手冊中有

重要的操作和維護（維修）説明。

有關安全性指導方針、法規遵守、EMI/EMF 相容性、存取範圍和相關主題的詳細資訊，請瀏覽 Extron 網站：www.extron.com，然後參閱《Extron 安全性與法規遵守手冊》，準則編號 68-290-01。

安全上のご注意

• 日本語

警告: この記号が製品上に表示されている場合は、筐体内に絶縁されて

いない高電圧が流れ、感電の危険があることを示しています。

注意:この記号が製品上に表示されている場合は、本機の取扱説明書に

記載されている重要な操作と保守( 整備)の指示についてユーザーの注意を喚起するものです。

安全上のご注意、法規厳守、EMI/EMF適合性、その他の関連項目については、エクストロンのウェブサイト www.extron.com より『 Extron Safety and Regulatory Compliance Guide』 ( P/N 68-290-01) をご覧ください。

경고: 이 기호 가 제품에 사용될 경우, 제품의 인클로저 내에 있는

접지되지 않은 위험한 전류로 인해 사용자가 감전될 위험이 있음을 경고합니다.

주의: 이 기호 가 제품에 사용될 경우, 장비와 함께 제공된 책자에 나와

있는 주요 운영 및 유지보수(정비) 지침을 경고합

안전 가이드라인, 규제 준수, EMI/EMF 호환성, 접근성, 그리고 관련 항목에 대한 자세한 내용은 Extron 웹 사이트(www.extron.com)의 Extron 안전 및 규제 준수 안내서, 68-290-01 조항을 참조하십시오.

니다.

Trademarks

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

The following registered trademarks®, registered service marks(SM), and trademarks(TM) are the property of RGBSystems, Inc. or Extron (see the current list of trademarks on the Terms of Use page at www.extron.com):

Registered Trademarks

(®)

Extron, Cable Cubby, ControlScript, CrossPoint, DTP, eBUS, EDID Manager, EDID Minder, eLink, Flat Field, FlexOS, Glitch Free, Global Configurator, Global Scripter, GlobalViewer, Hideaway, HyperLane, IPIntercom, IPLink, Key Minder, LinkLicense, LockIt, MediaLink, MediaPort, NAV, NetPA, PlenumVault, PoleVault, PowerCage, PURE3, Quantum, ShareLink, Show Me, SoundField, SpeedMount, SpeedSwitch, StudioStation, SystemINTEGRATOR, TeamWork, TouchLink, V-Lock, VideoLounge, VN-Matrix, VoiceLift, WallVault, WindoWall, XPA, XTP, XTP Systems, and ZipClip.

(SM)

Registered Service Mark

: S3 Service Support Solutions

Trademarks

(™)

AAP, AFL (Accu-Rate Frame Lock), ADSP (Advanced Digital Sync Processing), AVEdge, CableCover, CDRS (Class D Ripple Suppression), Codec Connect, DDSP (Digital Display Sync Processing), DMI (Dynamic Motion Interpolation), DriverConfigurator, DSPConfigurator, DSVP (Digital Sync Validation Processing), EQIP, Everlast, FastBite, Flex55, FOX, FOXBOX, IP Intercom HelpDesk, MAAP, MicroDigital, Opti-Torque, PendantConnect, ProDSP, QS-FPC (QuickSwitch Front Panel Controller), Room Agent, Scope-Trigger, SIS, Simple Instruction Set, Skew-Free, SpeedNav, Triple-Action Switching, True4K, True8K, Vector™ 4K, WebShare, XTRA, and ZipCaddy

FCC Class B Notice

NOTE: This device complies with part 15 of the FCC rules. Operation is subject to the

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 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. There is no guarantee that interference will not occur. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, you are 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.

In order to maintain compliance with FCC regulations, shielded cables must be used with this equipment. Operation with non-approved equipment or unshielded cables is likely to result in interference to radio and TV reception. The user is cautioned that changes and modifications made to the equipment without the approval of the manufacturer could void the user’s authority to operate this equipment.

following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation.

Battery Notice

NOTE: For more information on safety guidelines, regulatory compliances, EMI/EMF

compatibility, accessibility, and related topics see the Extron Safety and Regulatory

Compliance Guide on the Extron website.

This product contains a battery. Do not open the unit to replace the battery. If the battery needs replacing, return the entire unit to Extron (for the correct address, see the Extron

Warranty section on the last page of this guide).

CAUTION: Risk of explosion if battery is replaced by an incorrect type. Dispose of used

batteries according to the instructions.

ATTENTION : Risque d’explosion. Ne pas remplacer la pile par le mauvais type de pile.

Débarrassez-vous des piles utilisées selon le mode d’emploi.

Conventions Used in this Guide

Notiﬁcations

In this user guide, the following are used:

WARNING: Potential risk of severe injury or death. AVERTISSEMENT : Risque potentiel de blessure grave ou de mort.

CAUTION: Risk of minor personal injury. ATTENTION : Risque de blessuremineure.

ATTENTION:

•

Risk of property damage.

• Risque de dommages matériels.

NOTE: A note draws attention to important information.

Specifications Availability

Product specifications are available on the Extron website, www.extron.com.

Extron Glossary of Terms

A glossary of terms is available at www.extron.com/technology/glossary.aspx.

Contents

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

Important Safety Instructions ................................... 1

About the MPA 152 Plus ......................................... 2

MPA 152 Plus Features ........................................... 2

Panels and Cabling .............................................. 4

MPA 152 Plus Rear Panel Features ......................... 4

Power Connector ................................................ 4

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

Remote Control ...................................................7

Audio Output ......................................................9

Setup and Operation .......................................... 10

Front Panel Features and Operation ......................10

Setting Input Level ............................................11

Setting Bass and Treble ....................................11

Remote Control Options........................................12

Defeating the Auto Power-down Timer ..................13

Troubleshooting ....................................................14

Ampliﬁer Fails to Exit Standby Mode Promptly ...14

Ampliﬁer Enters Standby Mode Too Early .......... 14

Mounting ............................................................... 15

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

UL Guidelines for Rack Mounting ...................... 15

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

Back of the Rack Mounting ............................... 16

Other Mounting Options ........................................ 17

MPA 152 Plus • Contents vii

MPA 152 Plus • Contents viii

Introduction

This manual contains information about the Extron MPA 152 Plus mini power amplifier with instructions for experienced installers on how to install, configure, and operate the equipment. Unless otherwise specified, in this manual “amplifier” or “MPA” refer to the MPA152 Plus.

This section provides the following information:

• Important Safety Instructions

• About the MPA 152 Plus

• MPA 152 Plus Features

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 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 safety. If the provided plug does not ﬁt into the 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 or 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 if the 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 Plus • Introduction 1

About the MPA 152 Plus

Speakers

The MPA 152 Plus is an ENERGY STAR qualified amplifier with an Extron exclusive, highly efficient, advanced Class D amplifier design. It also features patented CDRS (Class D Ripple Suppression) technology that provides a smooth, clean audio waveform and an improvement in signal fidelity over conventional Class D amplifiers. The high efficiency design generates very little heat and allows the amplifier to be fanless and operated in environments with little or no ventilation.

This stereo integrated mini power amplifier 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. This model features a 90 dB signal-to-noise ratio with 0.1% THD+N, offering exceptional performance for speaker systems requiring compact, economical, audio amplification.

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

The quarter rack size allows a variety of mounting options. The unit complies with UL 2043 for smoke and heat release for in-the-ceiling installations. It can be installed in the plenum space of the ceiling. Alternatively, the units can be mounted on a tabletop, in a rack, under a desk, or in a projector mounting kit.

INPUTS

MPA 152 Plus

POWER 12V

0.7A MAX

Extron MPA 152 Plus

Mini Power Amplier

VID

DISPLAY

VID

VOLUME

IMAGE

ONFIG

Projector

RS-232 or IR Projector control

Audio

OUTPUT REMOTE

/ Ω 8

CLASS 2 WIRING

50mA

VC G

10V

Audio

Extron SM 3

Full-range

Audio

S-Video

RGBHV

Video

DVD/VCR Combo

MLC 104 IP PLUS

Extron

Extron MLC 104 IP Plus

MediaLink Controller with IP Link

Laptop

Figure 1. Typical Application for the MPA 152 Plus

MPA 152 Plus Features

30 watts (rms) output power — 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. Provides significant audio output for small integration projects with moderate sound system needs.

Improved signal-to-noise ratio — The 90 dB unweighted signal-to-noise ratio allows very low-noise operation, ensures quiet, hiss-free amplification, and maintains audio signal integrity.

ENERGY STAR qualified amplifier — The MPA 152 Plus conserves energy and reduces operating costs.

Defeatable auto power-down timer for 24/7 applications — Ensures that the amplifier is always active for 24/7 operation in critical applications, while still retaining the ENERGYSTAR qualification.

MPA 152 Plus • Introduction 2

Extron patented CDRS - Class D Ripple Suppression — CDRS is an Extron patented

technology that provides a smooth, clean audio waveform and an improvement in signal fidelity over conventional Class D amplifier designs. CDRS eliminates the high frequency switching ripple characteristic of Class D amplifiers, a source of RF emissions which can interfere with sensitive AV equipment such as wireless microphones.

Front panel bass, treble, and input level controls — These are flush mounted and detented. They allow quick attenuation of input signal and ±10 dB bass and treble shelving controls.

Stereo or Dual Mono toggle switch — Allows the user to choose between stereo output or to sum the left and right inputs and produce dual mono outputs (see figure 7 on page 9). This eliminates the need for external summing products in monoaural installations.

UL 2043 plenum rated — The MPA 152 Plus complies with UL 2043 for smoke and heat release for installation within a plenum airspace above a drop ceiling (power supply excluded). Above-the-ceiling placement conceals the amplifier to prevent theft, and is convenient for installing equipment when space inside the room is limited.

Three audio inputs — Accept balanced or unbalanced stereo line-level signals on a captive screw connector and unbalanced stereo line-level signals on an RCA stereo pair, and a 3.5 mm stereo mini jack. This ensures the amplifier can be easily integrated with a wide variety of sources and projectors.

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

Auto power-down with fast power-up — The MPA 152 Plus meets ENERGY STAR qualification requirements with an auto power-down feature that automatically places the amplifier into standby after 25 minutes of inactivity, dramatically reducing power consumption. It quickly returns to full power status in less than one second upon signal detection. This feature can be defeated to allow for 24/7 operation.

Quick-plug speaker outputs — Speaker output is on a screw-lock 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, 3 inch deep, quarter rack wide metal

enclosure, which offers flexible mounting options.

MPA 152 Plus • Introduction 3

Panels and

EEFF

Cabling

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

MPA 152 Plus Rear Panel Features

The rear panel of the MPA 152 Plus (shown in figure 2 below) allows the user to connect power (see below), Audio Inputs (see page 6), Remote Control (see page 7), and Audio

Output (see page 9).

MPA 152 Plus

POWER

12V

0.7A MAX

Figure 2. MPA 152 Plus Rear Panel Features

A B C

Power Connector

Power connector — The MPA152 Plus ships with an Extron 24 W desktop power supply.

The power cord connectors are correctly wired when shipped. Connect the pre-wired captive screw connector to the power receptacle on the amplifier (see figure 3 on page 6).

INPUTS

AAAB

Power Connector

RCA connectors (see page 6)

Stereo jack input (see page 6)

8Ω / 4Ω

CLASS 2

WIRING

VCG

10V

Captive screw input (see page 6)

Remote control connectors (see page 7)

Speaker connectors (see page 9)

OUTPUTS

REMOTE

50mA

MPA 152 Plus • Panels and Cabling 4

ATTENTION:

•

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.

• Utilisez toujours une source d’alimentation fournie ou recommandée par Extron.

L’utilisation d’une source d’alimentation non autorisée annule toute certiﬁcation de conformité réglementaire, et peut endommager la source d’alimentation et l’unité.

• Suitable for use in environmental air space in accordance with Section300.22.C of the

National Electrical Code, and Sections 2-128, 12-010(3) and 12-100 of the Canadian Electrical Code, Part 1, C22.1.

• Convient à une utilisation dans les conduits d’aération, en accord avec la section

300.22.C du code national d’électricité américain, et avec les sections 2-128, 12-010(3) et 12-100 du code d’électricité canadien, partie 1, C22.1.

• 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 AV processing equipment in an ordinary location, Pollution Degree 2, secured to the equipment rack within the dedicated closet, podium, or desk.

• Sauf mention contraire, les adaptateurs CA/CC ne conviennent pas à une utilisation

dans les espaces d’aération ou dans les cavités murales. La source d’alimentation doit être placée à proximité de l’équipement Extron dans un emplacement ordinaire soumis à un degré de pollution de catégorie II, solidement ﬁxé au rack d’équipement d’une baie technique, d’un pupitre, ou d’un bureau.

• 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. The DC power cord provided with the unit is not plenum rated.

• Bien que l’ampliﬁcateur soit conforme à la norme relative aux faux plafonds, la source

d’alimentation fournie avec ne l’est pas. La source d’alimentation ne doit pas être placée dans l’espace plenum. Les câbles depuis et vers l’ampliﬁcateur doivent aussi être classés plenum. Le cordon d’alimentation CC fourni avec l’unité n’est pas classé plenum.

• The installation must always be in accordance with the applicable provisions of National

Electrical Code ANSI/NFPA 70, article 725 and the Canadian Electrical Code part1, section 16.

• Cette installation doit toujours être conforme aux dispositions applicables du Code

américain de l’électricité (National Electrical Code) ANSI/NFPA 70, article 725, et du Code canadien de l’électricité, partie1, section16.

• The power supply shall not be permanently ﬁxed to building structure or similar

structure.

• La source d’alimentation ne devra pas être ﬁxée de façon permanente à la structure de

bâtiment ou à d’autres structures similaires.

• 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.

• La longueur des câbles exposés est primordiale lorsque l’on entreprend de les dénuder.

La longueur idéale est de 5mm (3/16inches). S’ils sont trop longs, les câbles exposés pourraient se toucher et provoquer un court-circuit. S’ils sont trop courts, ils peuvent être tirés facilement, même s’ils sont correctement serrés par les borniers à vis.

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

over time.

MPA 152 Plus • Panels and Cabling 5

MPA 152 Plus

Ampliﬁer

(5 mm) Max.

BBBC

CCDDD

Tip (+)

RCA Connector

Tip (L)

3.5 mm TRS Connector

Balanced Mono Input

Balanced Stereo Input

Unbalanced Stereo Input

Slee

Unbalanced Mono Input

POWER 12V

0.7A MAX

Power Receptacle

Smooth

Power Supply

Output Cord

POWER 12V

0.7A MAX

Ridges

Tie

Wrap

Ground

+12 VDC input

DC Power Cord Captive Screw Connector

Ground all

Devices

AC Power Cord

SECTION A–A

External Power Supply (12 VDC, 2.0 A)

3/16"

Figure 3. Power Connector

Audio Inputs

Use the rear panel receptacles (see figure 4) to connect audio sources to the amplifier. Wire the connectors as shown below.

INPUTS

Figure 4. Audio Inputs

RCA unbalanced stereo input connectors — These receptacles accept unbalanced, line

level audio signals. The input can be stereo, using two RCA connectors, or mono, using a single RCAconnector plugged into the left receptacle.

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

3.5 mm unbalanced stereo input jack — This input also

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

Captive screw balanced or unbalanced audio input connector

— This 5-pole 3.5 mm captive screw receptacle accepts line level, balanced or unbalanced, mono or stereo audio inputs.

Sleeve ( )

Ring (R)

Tip

Sleeve ( )

Tip

Ring

Sleeves

Tip

Ring

Sleeve

Tip

Ring

Sleeve

See the attention and note on the following page for important information about connecting wires to captive screw connectors.

MPA 152 Plus • Panels and Cabling 6

ATTENTION:

Ground (Pin 3)

V 1

REMOTE

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

•

• La longueur des câbles exposés est primordiale lorsque l’on entreprend de les dénuder.

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

over time.

Depending on the position of the front panel toggle switch (figure 8,

, on page 10), the

right and left channels may be output as a stereo signal or as a dual mono signal. See Audio

Output on page 9 for more information.

Remote Control

Remote Control Input — This 3-pin, captive screw port allows an

audio controller to control volume and mute levels remotely. See Remote

Control Options on page 12 if using a MediaLink controller.

Wiring for remote control

Options for remote control include the Extron VC50, VCM100AAP, VCM100MAAP, VCM200 series, and MLAVC10 Plus. Third party 10k potentiometer volume controllers can also be connected to this port.

Figure 5 and the instructions below show the wiring for the VCM 100 MAAP. Wiring other remote control connectors is similar.

REMOTE

VCG

olume Pot 0k ohms

10 V (Pin 1)

2k ohms

Mute Switch

10V 50mA

Vol/Mute (Pin 2)

VCG

10V50mA

Figure 5. Remote Control Wiring

• Pin 1 is for 10 VDC reference voltage output.

• Pin 2 (C) has two functions:

• Volume control: it can be used as a variable voltage input between 0 and 10 VDC,

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

• Mute: it can be used for remote control muting. Sound is muted while this pin is shorted

to ground.

• Pin 3 is for the ground connection.

NOTE: All nominal levels are at ±10%.

MPA 152 Plus • Panels and Cabling 7

Controlling multiple ampliﬁers with one volume controller

10V 50mA

VOL/MUTE

Ext MP Daisy Chain

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

NOTES:

• As additional ampliﬁers are added to the daisy chain, the sensitivity of the volume

potentiometer changes. The maximum volume level (fully clockwise) is not 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 ampliﬁers 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 however can be remedied with a contact closure button attached between the C (volume or mute) and G (ground) pins of the ﬁrst ampliﬁer 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Plus unit only:

• Ground ( ) to ground (G)

• Vol/Mute to C

• 10 V to V.

2. Use jumper wires to connect the C (Volume and Mute) pins of the ﬁrst ampliﬁer and each

successive ampliﬁer.

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

ampliﬁer.

Extron

10V

VCM 100 AAP

ron

A 152 Plus

VCG

Figure 6. Regulating Multiple Ampliﬁers with a Single Volume Controller

NOTE: The 10V pin of the volume controller connects to the first MPA 152 Plus only.

There are no jumper wires linking it to subsequent amplifiers.

MPA 152 Plus • Panels and Cabling 8

Audio Output

Captive

Left

Right

Stereo/Dual Mono Switch

Speaker Connectors — This 4-pole, 5 mm screw lock captive screw receptacle is used to

connect the ampliﬁer to the speakers.

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.

ATTENTION:

• The length of the exposed wires in the stripping process is critical. The ideal length is

• La longueur des câbles exposés est primordiale lorsque l’on entreprend de les dénuder.

• Do not ground or short the speaker outputs as this will damage the ampliﬁer.

• Ne pas mettre à la terre ni créer de court-circuit dans les sorties de l’enceinte, aﬁn

d’éviter tout risque de détérioration de l’ampliﬁcateur.

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

over time.

Screw

RCA

TRS

Captive

Screw

RCA

TRS

Figure 7. MPA 152 Plus Summing Diagram

Signal flow is as follows:

Stereo

Dual Mono

Stereo

Amp Stage

1. The MPA 152 Plus sums and weights the left unbalanced signals from the TRS and RCA

inputs. This summed, unbalanced signal is then summed with the left balanced signal from the captive screw input.

2. The right channel is handled in the same way.

3. The left and right channels are then sent to the output ampliﬁers in one of two ways,

depending on how the front panel switch (see ﬁgure 8, B, on the next page) is set.

• Stereo: The left and right channels are sent to the left and right output ampliﬁers

respectively.

• Dual Mono: The left and right channels are summed and then the resulting mono is fed

to both of the output ampliﬁers.

The captive screw, RCA, and TRS inputs are buffered.

MPA 152 Plus • Panels and Cabling 9

Setup and

BBCC

Operation

This section discusses:

• Front Panel Features and Operation

• Remote Control Options

• Defeating the Auto Power-down Timer

• Troubleshooting

Front Panel Features and Operation

This section describes how configure the MPA 152 Plus, using the front panel controls and how to set up the remote control options.

STEREO

DUAL MONO

Figure 8. MPA 152 Plus Front Panel

Power LED — The LED lights green when the MPA 152 Plus unit is receiving power and

active. It lights amber when the unit is powered down (after 25 minutes of inactivity).

STEREO or DUAL MONO toggle switch — Allows the user to choose between stereo

output for stereo applications (default) or dual mono output for mono applications.

LEVEL, BASS, and TREBLE potentiometers — Three front panel potentiometers are

used to optimize input level, bass, and treble settings.

BASSLEVEL TREBLE

MPA 152 Plus

MINI POWER AMPLIFIER

MPA 152 Plus • Setup and Operation 10

Do not use excessive torque when adjusting the LEVEL, BASS, or TREBLE potentiometers. Read the following notification before adjusting the potentiometers:

ATTENTION:

• The default position of the LEVEL potentiometer when shipped is turned fully counter-

clockwise (fully attenuated). The default position of the BASS and TREBLE potentiometers is 12 o’clock (ﬂat response).

• La position par défaut du potentiomètre de niveau lors de son expédition est orientée

vers le sens antihoraire (atténuation complète). La position par défaut des potentiomètres de graves et d’aigus est 12 h (réponse linéaire).

• Do not use a screwdriver to adjust the potentiometers. The potentiometers should only

be adjusted as needed using the included Extron tweeker (small screwdriver).

• Ne pas utiliser de tournevis pour ajuster les potentiomètres. Les potentiomètres doivent

uniquement être ajustés selon les besoins avec le petit tournevis Extron fourni.

• While potentiometer tuning knobs may look like screws, they do not function in the same

manner. Use a light touch when adjusting to avoid applying excessive torque to the potentiometers.

• Bien que les boutons de réglage du potentiomètre ressemblent à des vis, ils n’ont pas

la même fonction. Exercez une pression légère lors du réglage aﬁn d’éviter un serrage excessif des potentiomètres.

• Applying excessive torque can cause mechanical damage to the potentiometer,

rendering it inoperable.

• Un serrage excessif peut endommager le potentiomètre, le rendant inutilisable.

Setting Input Level

Adjust the MPA 152 Plus input level as follows:

1. Unplug the Remote plug from the unit.

2. Set the volume of the audio source to its minimum level by turning the LEVEL potentiometer

fully counterclockwise to its minimum setting without using excessive torque.

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

4. Slowly increase the MPA 152 Plus level by rotating the LEVEL potentiometer clockwise

without using excessive torque until sound distortion starts.

5. Lower the level slightly until the distortion disappears. At this setting, whatever the volume

setting of the audio source, no clipping will occur.

Setting Bass and Treble

NOTES:

• Do not use excessive torque when adjusting the BASS or TREBLE potentiometers.

• 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.

Adjust the MPA 152 Plus 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 treble shelving ±10 dB at 10kHz

and above.

MPA 152 Plus • Setup and Operation 11

Remote Control Options

DVD S-video Audio RCA

VCR

Composite Audio RCA

PROJECTOR

OFF

VOLUME

CONFIG

8 ohm Ceiling

PC VGA w/

Speakers in Parallel

Audio Cable

OUTPUT REMOTE

/ Ω 8

CLASS 2 WIRING

V C G

10V 50mA

INPUTS

MPA 152 Plus

POWER

12V

0.7A MAX

Extron MPA 152 Plus

Mini Power Ampliﬁer

Variable Audio Output

ComLink

MLC 104 IP

MUTE

VOLUME

VCM 100 AAP

Extron

MLC 104 IP

Controller

Projector

111

IR Remote

Extron

VCM 100 AAP

Volume/Mute Controlle

Figure 9. Typical Application for the MPA 152 Plus, Using Remote Control

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

outputs, connect the projector audio output to the MPA 152 Plus 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 Plus.

Extron volume controllers — Extron provides a range of volume and mute controllers

for use with a projector that lacks variable audio outputs. These options control the MPA 152 Plus volume directly (see Wiring for remote control on page 7).

Using a MediaLink Controller — For a projector with variable audio output, connect the

projector audio output to the MPA 152 Plus audio input. Use a MediaLink controller to adjust the volume of the projector via RS-232. MediaLink controllers can also use the IR remote to adjust the volume of the projector and, thus, the input to the ampliﬁer.

MPA 152 Plus • Setup and Operation 12

Defeating the Auto Power-down Timer

The auto power-down timer determines whether or not the amplifier enters standby mode. The amplifier powers down if the input signal remains below the input signal detection threshold for about 25 minutes.

The timer resets whenever the input signal exceeds the input signal detection threshold. Resetting the timer starts a new 25-minute countdown until the amplifier powers down. Resetting the timer also causes an amplifier that is already powered down to “wake up.”

There may be times when it is desirable to bypass the auto power-down timer. However, this should be done as a last resort. Examples of when defeating the auto power-down circuit might be required include:

• If the ampliﬁer is used in a paging system. When the ampliﬁer has already powered down,

the ﬁrst syllable might be cut off as the ampliﬁer wakes up from standby mode.

• If the input signal is so quiet that the level remains below the input signal detection threshold

for 25minutes, the timer would cut the audio in the middle of playback by placing the ampliﬁer into standby mode.

ATTENTION:

The following procedure cannot be reversed and should be carried out as a last resort.

•

Be certain that you need to defeat the auto power-down timer before continuing.

• La procédure qui suit est irréversible et doit être effectuée en dernier recours. Veuillez

désactiver le temporisateur de mise hors tension automatique avant de continuer.

To defeat the auto power-down timer, follow these instructions:

1. Disconnect power from the ampliﬁer.

2. Remove the four screws that secure the top enclosure to the bottom enclosure (there are

two screws on each side panel).

ATTENTION:

Exercise caution when removing the screws to avoid stripping the screw heads.

•

• Soyez prudent en retirant les vis aﬁn d’éviter d’abîmer les têtes de vis.

3. Slide the top enclosure forward to clear the switch and potentiometers on the front panel,

then lift it straight up to separate it from the bottom enclosure.

The circuit boards are now exposed at the front.

ATTENTION:

Do not touch the electronic components or connectors without being electrically

•

grounded. Handle circuit boards by their edges only. Electrostatic discharge (ESD) can damage equipment, although you may not feel, see, or hear it.

• Ne pas toucher les composants électroniques ou les connecteurs sans être

électriquement relié à la terre. Manipuler les circuits imprimés en les tenant seulement par leurs bords. Les décharges électrostatiques (ESD) peuvent endommager l’équipement, même si vous ne pouvez pas le sentir, le voir ou l’entendre.

MPA 152 Plus • Setup and Operation 13

Resistor R42

Troubleshooting

Stereo to Dual Mono Toggle Switch

Figure 10. Front View, Showing the Location of Resistor R42

Level Potentiometer

4. Identify resistor R42 at the front of the bottom circuit board between the STEREO to DUAL

MONO toggle switch (to the left) and the LEVEL potentiometer (to the right). The resistor is

shown in the white box in ﬁgure 10.

5. Remove the resistor using a pair of diagonal cutters to clip the wires attaching it to the circuit

board.

6. Re-attach the top enclosure with the four screws removed in step 1.

Under different circumstances, the front panel LED lights green or amber to provide diagnostic information.

Power LED Color Problem Description Problem Solution

Amber No output signal. No input detected: verify that

there is an input signal.

If a signal is present, raise the level of the source signal.

Green No output signal. The amplifier may be in mute

mode. Check the Remote port.

Green or Amber Slow to exit standby mode

when a signal is present.

The input signal may be too weak. Raise the level of the source signal.

Ampliﬁer Enters Standby Mode Too Early

Power LED Color Problem Description Problem Solution

Green or Amber Enters standby mode early. The input signal may be too

weak. Raise the level of the source signal.

Ampliﬁer Fails to Exit Standby Mode Promptly

MPA 152 Plus • Setup and Operation 14

Mounting

This section provides information about the mounting options for the MPA 152 Plus.

• Rack Mounting

• Other Mounting Options

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).

MPA 152 Plus • Mounting 15

Rack Mounting Procedure

3.67"

The unit can be mounted on a compatible rack system (optional). Follow the instructions provided with the shelf accessories.

ATTENTION:

Use only the two holes indicated in ﬁgure 11 for mounting the MPA152Plus. 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.

• Utilisez seulement les deux trous, comme indiqué dans ﬁgure 11, pour monter le

MPA152Plus. Les quatre autres trous ﬁxent des entretoises pour les circuits imprimés internes. Le fait de les utiliser pourrait endommager l’ampliﬁcateur et n’assurera pas un montage sécurisé pour l’unité.

1.44"

Hole for Rack Mounting Screw (#4-40 Thread)

Figure 11. Base of MPA 152 Plus to Show Mounting Holes

Back of the Rack Mounting

Mount the unit at the back of a rack rail, following the instructions provided with the kit.

MPA 152 Plus • Mounting 16

Other Mounting Options

Tabletop placement — Place the unit in any convenient location.

Plenum placement — The MPA 152 Plus amplifier complies with Section 300.22 (c) of the

National Electrical Code and is suitable for use in an Environmental Air Space. It can be installed in the ceiling, out of sight, with reduced risk of theft.

ATTENTION:

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. The DC power cord provided with the unit is not plenum rated.

• Bien que l’ampliﬁcateur soit conforme à la norme relative aux faux plafonds, la source

Under-desk mounting — Mount the unit under a desk or podium, following the instructions provided with the kit.

Pole mounting — Mount the unit above a projector using a Pole Mounting Kit. Follow the instructions provided with the kit.

ZipClip 200 mounting — Mount the unit under furniture or to a rack rail using the ZipClip 200. Follow the instructions provided with the mounting kit.

MPA 152 Plus • Mounting 17

Extron Warranty

Extron 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 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 1230 South Lewis Street Anaheim, CA 92805 U.S.A.

Europe:

Extron Europe Hanzeboulevard 10 3825 PH Amersfoort The Netherlands

Africa:

Extron South Africa South Tower 160 Jan Smuts Avenue Rosebank 2196, South Africa

Asia:

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

China:

Extron China 686 Ronghua Road Songjiang District Shanghai 201611 China

Japan:

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

Middle East:

Extron Middle East Dubai Airport Free Zone F13, PO Box 293666 Dubai, United Arab Emirates

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 if modiﬁcations were made to the product that were not authorized by Extron.

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: 714.491.1500 or 800.633.9876 Asia: 65.6383.4400

Europe: 31.33.453.4040 or 800.3987.6673 Japan: 81.3.3511.7655

Africa: 27.11.447.6162 Middle East: 971.4.299.1800

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 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 be liable for direct, indirect, or consequential damages resulting from any defect in this product even if Extron 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.

Worldwide Headquarters: Extron USA West, 1025 E. Ball Road, Anaheim, CA 92805, 800.633.9876

Extron MPA 152 Plus User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety Instructions

FCC Class B Notice

Battery Notice

Conventions Used in this Guide

Extron Glossary of Terms

Introduction

• Important Safety Instructions

Important Safety Instructions

About the MPA 152 Plus

MPA 152 Plus Features

MPA 152 Plus Rear Panel Features

Figure 2. MPA 152 Plus Rear Panel Features

Power Connector

Audio Inputs

Remote Control

Audio Output

• Front Panel Features and Operation

Front Panel Features and Operation

Setting Input Level

Setting Bass and Treble

Remote Control Options

Defeating the Auto Power-down Timer

Troubleshooting

Mounting

• Rack Mounting

Rack Mounting

UL Guidelines for Rack Mounting

Rack Mounting Procedure

Back of the Rack Mounting

Other Mounting Options

Extron Warranty