Yamaha MY4-AEC User Manual

ACOUSTIC ECHO CANCELLER CARD

MY4

-

AEC

Owner’s Manual
Bedienungsanleitung
Mode d’emploi
Manual de instrucciones
Manuale di istruzioni
Руководство пользователя

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MY4

-

AEC

ACOUSTIC ECHO CANCELLER CARD

FCC INFORMATION (U.S.A.)

1. IMPORTANT NOTICE: DO NOT MODIFY THIS UNIT!

This product, when installed as indicated in the
instructions contained in this manual, meets FCC
requirements. Modifications not expressly approved by
Yamaha may void your authority, granted by the FCC, to
use the product.

2. IMPORTANT: When connecting this product to

accessories and/or another product use only high
quality shielded cables. Cable/s supplied with this
product MUST be used. Follow all installation
instructions. Failure to follow instructions could void
your FCC authorization to use this product in the USA.

3. NOTE: This product has been tested and found to

comply with the requirements listed in FCC Regulations,
Part 15 for Class “B” digital devices. Compliance with
these requirements provides a reasonable level of
assurance that your use of this product in a residential
environment will not result in harmful interference with
other electronic devices. This equipment generates/uses
radio frequencies and, if not installed and used
according to the instructions found in the users manual,
may cause interference harmful to the operation of
other electronic devices. Compliance with FCC

* This applies only to products distributed by YAMAHA CORPORATION OF AMERICA. (class B)

regulations does not guarantee that interference will not
occur in all installations. If this product is found to be
the source of interference, which can be determined by
turning the unit “OFF” and “ON”, please try to eliminate
the problem by using one of the following measures:

Relocate either this product or the device that is being
affected by the interference.

Utilize power outlets that are on different branch (circuit
breaker or fuse) circuits or install AC line filter/s.

In the case of radio or TV interference, relocate/reorient
the antenna. If the antenna lead-in is 300 ohm ribbon
lead, change the lead-in to co-axial type cable.

If these corrective measures do not produce
satisfactory results, please contact the local retailer
authorized to distribute this type of product. If you can
not locate the appropriate retailer, please contact
Yamaha Corporation of America, Electronic Service
Division, 6600 Orangethorpe Ave, Buena Park, CA90620

The above statements apply ONLY to those products
distributed by Yamaha Corporation of America or its
subsidiaries.

CANADA

This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.

• This applies only to products distributed by Yamaha Canada Music Ltd. (class B)

• Ceci ne s’applique qu’aux produits distribués par Yamaha Canada Musique Ltée.

This device complies with Part 15 of the FCC Rules. Operation is subject to the 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.

PRECAUTIONS

PLEASE READ CAREFULLY BEFORE
PROCEEDING

* Please keep this manual in a safe place for
future reference.

WARN ING

Always follow the basic precautions listed below to
avoid the possibility of serious injury or even death
from electrical shock, short-circuiting, damages,
fire or other hazards. These precautions include, but
are not limited to, the following:

• Do not install the card in any Yamaha products not
specified by Yamaha for use with the card to avoid possible
electrical shock, fire, or equipment damage.

• Do not attempt to disassemble or modify the card. Do not
apply excessive force to card connectors or other card
components. Mishandling of the card may lead to shock,
fire hazard, or equipment failure.

• Be sure to disconnect the power cable of the host device
before installing the card and connecting/disconnecting the
cables (in order to eliminate shock hazard, undesired noise,
and avoid equipment damage).

• Turn off all peripheral devices connected to the host device
before installation, and unplug all related cables (in order
to eliminate shock hazard, undesired noise, and avoid
equipment damage).

CAUTION

Always follow the basic precautions listed below to
avoid the possibility of physical injury to you or
others, or damage to the device or other property.

These precautions include, but are not limited to,
the following:

• Be sure to properly ground the host device to prevent
electrical shock and/or malfunction.

• Do not touch the metallic leads (pins) of the circuit board
when handling the card. The pins are sharp and may cause
hand cuts.

• Wear a pair of heavy gloves during installation to avoid
scratching or cutting your hands on sharp edges.

• Avoid touching exposed connectors and metal parts to
minimize the possibility of bad connections.

• Drain all static electricity from your clothing and body
before handling the card. Static electricity can damage the
card. Touch an exposed metal part of the host device or
other grounded object beforehand.

• Do not drop the card or subject it to physical shock as this
can result in breakage and/or malfunction.

• Do not drop screws or other small parts inside the card. If
power is applied while screws or similar metal objects are
loose inside the unit the card may malfunction or be
damaged. If you cannot retrieve dropped objects yourself,
refer the problem to qualified Yamaha service personnel.

Yamaha cannot be held responsible for damage caused by
improper use or modifications to the device, or data that is
lost or destroyed.

• The illustrations as shown in this manual are for
instructional purposes only, and may be different from the
ones on your equipment.

• The company names and product names in this manual are
the trademarks or registered trademarks of their respective
companies.

MY4-AEC Owner’s Manual 3

Information for Users on Collection and Disposal of Old Equipment

This symbol on the products, packaging, and/or accompanying documents
means that used electrical and electronic products should not be mixed with
general household waste.
For proper treatment, recovery and recycling of old products, please take them
to applicable collection points, in accordance with your national legislation and
the Directives 2002/96/EC.

By disposing of these products correctly, you will help to save valuable
resources and prevent any potential negative effects on human health and the
environment which could otherwise arise from inappropriate waste handling.

For more information about collection and recycling of old products, please contact your local
municipality, your waste disposal service or the point of sale where you purchased the items.

[For business users in the European Union]

If you wish to discard electrical and electronic equipment, please contact your dealer or supplier
for further information.

[Information on Disposal in other Countries outside the European Union]

This symbol is only valid in the European Union. If you wish to discard these items, please contact
your local authorities or dealer and ask for the correct method of disposal.

European models
Purchaser/User Information specified in EN55103-1 and EN55103-2.
Conforms to Environments: E1, E2, E3 and E4

4 MY4-AEC Owner’s Manual

Introduction

Thank you for choosing the Yamaha MY4-AEC. The MY4-AEC is an acoustic echo canceller
card designed for use with the DME64N/24N Digital Mixing Engines that can effectively reduce
troublesome acoustic echoes due to secondary pickup of speaker output and reflections from
room surfaces in teleconferencing situations. It is also capable of reducing feedback as well as
ambient noise from air conditioning and fans. This technology enables noise-free, high­intelligibility teleconferencing in just about any environment. Four AES/EBU input and output
channels are provided, all with built-in sample rate conversion capability. The MY4-AEC can
also connect to digital audio devices that do not allow word clock synchronization.

Installation

Refer to the DME64N/24N owner’s manual for installation details. The screws on the left and
right sides of the card also ground (earth) the device, so be sure to tighten them securely.

Supplied Items

 Owner’s Manual (this document)

 3-pin Euroblock plugs x 4

 Cable ties x 4

MY4-AEC Owner’s Manual 5

Principle of Operation

“Hello”

Remote Local

“Hello”

“How’s business?”

Fan noise

“How’s business”

+ “Hello”
+ fan noise

“How’s business?”

DME64N/24N

MY4-AEC

+

How Acoustic Echo and Noise are Reduced

Acoustic echo occurs in a teleconferencing system when the sound from a speaker or
reflections from surfaces of the room are picked up by a microphone and transmitted to the
other party, resulting in a loss of intelligibility. Projectors and air conditioning systems also
produce noise that can interfere with clear teleconferencing. The echo cancelling and noise
reduction capabilities of the MY4-AEC help to achieve maximum clarity and intelligibility for
smooth, effective communication.

ENTERCANCEL

HOME UTILITYSCENE LEVEL MUTE

NOTE

In order to reduce acoustic echo originating from the remote location, an echo canceller must be
installed and active at the remote location.

6 MY4-AEC Owner’s Manual

MY4-AEC Signal Flow

Reference signal FBS: Feedback suppressor NR: Noise reduction

The local and remote locations in a teleconferencing system are referred to as the “near end”
and “far end”, respectively. The MY4-AEC acoustic echo canceller (AEC) works by comparing
the reference signal received from the far-end with the signal from the microphone in order to
determine which components of the signal are echo, and then subtracts only the far-end echo
component from microphone signal. The near-end sound is thus clearly transmitted to the far
end without echo.

To Far-end 4

NR

NR
NR

NR

NR

Matrix Router

NR

NR

NR

AEC

AEC

AEC

AEC

FBS

FBS

FBS

FBS

Near-end Mic. 1

Near-end Voice 1

Near-end Mic. 4

Near-end Voice 4

Near-end Mic. 3

Near-end Voice 3

Near-end Mic. 2

Near-end Voice 2

MY4-AEC Owner’s Manual 7

From Far-end A Far-end Voice A
From Far-end B Far-end Voice B
From Far-end C Far-end Voice C
From Far-end D Far-end Voice D

To Far-end 3

To Far-end 2

To Far-end 1

The Connectors and Their Functions

AES/EBU IN and OUT Connectors

These connectors support four channels of AES/EBU format digital audio input and output to
and from the host DME64N/24N unit, but those signals are not directly routed via the MY4-AEC
processing section. Signals from the host’s analog or digital inputs must be routed to the MY4­AEC card’s AEC processing section via the host’s processing section in order to apply echo
cancellation, as shown in the illustration below. Operational details are provided in the DME
Designer owner’s manual. Built-in sample rate conversion is provided for all inputs and outputs
(sample rate conversion settings are also made via the DME Designer software).
Use the supplied Euroblock plugs for connection (refer to “Euroblock Connection” on
page 10).

NOTE

The channel 3 and channel 4 inputs and outputs ([IN3/4] and [OUT3/4] in the above illustration)
cannot be used when the DME64N/24N word clock sampling rate is set to 88.2 kHz or 96 kHz.

8 MY4-AEC Owner’s Manual

DME Processing

DME64N/24N

MY4-AEC

AEC

Processing

SRC SRC

AES/EBU

[OUT1/2][OUT3/4]

AES/EBU
[IN1/2][IN3/4]

Analog Out Mic In

MY4-AEC Owner’s Manual 9

Euroblock Connection

approx.

7 mm

1.6 mm or less
approx.

7 mm

Please be sure to use the supplied Euroblock plugs to connect the AES/EBU [IN] and [OUT]
connectors.

Cable preparation

• To prepare the cable for attachment to a Euroblock

connector, strip the wire as shown in the illustration
using stranded wire to make connections. With a
Euroblock connection, stranded wires may be prone to
breakage because of metal fatigue due to the weight of
the cable or due to vibration. Bundle the cables and the
Euroblock tabs using the supplied cable ties (page 12). When rackmounting your
equipment, use a lacing bar when possible to bundle and fasten the cables.

NOTE

Do not tin (plate with solder) the exposed end.

• If cables will be frequently connected and

disconnected, as in the case of a portable installation,
we recommend that you use ferrules with insulation
sleeves. Use a ferrule whose conductor portion has an
external diameter of 1.6 mm or less, and a length of
approximately 7 mm (such as the AI0,5-6WH made by
the Phoenix Contact corporation).

10 MY4-AEC Owner’s Manual

1 Loosen terminal screws.

Loosen.

Slotted
Screwdriver

Ter mi na l
Screw

Euroblock
Plug

Tab

3mm or less

+
–

G

NOTE

A slotted screwdriver with a blade width of
about 3 millimeters is recommended.

2 Insert cables.

3 Securely tighten terminal

screws.

Pull the cables (not too strongly) to
confirm that they are securely
connected.

MY4-AEC Owner’s Manual 11

4 Bundle the cables and the

Euroblock tab using the
supplied cable tie.

NOTE

Trim any excess part of the cable tie as
necessary.

5 Insert the Euroblock plug into

the AES/EBU [IN] or [OUT]
connector of the MY4-AEC.

12 MY4-AEC Owner’s Manual

Basic Connection and Setup

Example 1: Teleconferencing with a Remote Location

This is an example of a teleconferencing system set up to allow multiple participants to hold
conferences with a remote location (“Office X”).

Preparation

The first step is to make the basic local (near end) connections and determine the optimum
microphone and speaker locations as well as gain settings. The AEC system will have the best
possible effect if these initial steps are carried out properly.

1 Prepare the following equipment.

 DME24N x 1

 MY4-AEC x 1

 Microphones x 4

 Speakers x 2

NOTE

Be sure to choose microphones and speakers that have good frequency response characteristics
in order to ensure optimum AEC operation.

2 Connect the microphones and speakers to the analog [IN] and [OUT]

connectors on the DME24N rear panel as shown in the diagram.

MY4-AEC Owner’s Manual 13

3 Make the required virtual connections in the DME Designer configuration

Meeting Room (Near End)

Speaker 1

Speaker 2

Microphone 1

Microphone 2

Microphone 3

Microphone 4

IN (Analog)

OUT

(Analog)

DME24N

MY4-AEC

+

window.

• Connect the signals from microphone inputs 1 – 4 to the “Near-end Mic. 1” – “Near-end

Mic. 4” inputs on the AEC component.

• Place an oscillator that will be used for AEC adjustment in the configuration window and

connect it to the AEC component “From Far-end A” input.

• The “Far-end voice A” output is connected to the conference room speakers (SP 1 and

SP 2) in parallel.

14 MY4-AEC Owner’s Manual

4 Speak into the microphones as you would during an actual conference

and adjust the input gain of each channel.

Adjust the DME24N HA Gain while watching the “Mic. In” meters in the AEC component
editor so that the yellow segment lights only occasionally.

NOTE

AEC may not function properly if the gain is set too high.

MY4-AEC Owner’s Manual 15

5 Open the Oscillator component editor, set the Wave Form type to “Pink,”

and engage the Output section “On” button.

Go back to the AEC component editor and, while watching the “Ref. In” meter, adjust the
oscillator output level so that the yellow segment lights only occasionally.

16 MY4-AEC Owner’s Manual

6 Check that the ERL (Echo Return Loss) meter in the AEC component is

moving.

If this meter is moving over a wide range it means that a large portion of the pink noise
being output from the speaker is being picked up by the corresponding microphone, and
therefore a large amount of echo will be transmitted to the remote location. Carefully adjust
the positions and pickup directions of the four microphones in relation to the speakers in
order to reduce this echo level as much as possible. The more you can reduce the echo at
this stage, the more effective the AEC will be.

NOTE

• If the local meeting room is very reflective or reverberant, it may be difficult to reduce the echo

level sufficiently by simply repositioning the microphones and speakers. In such cases it may
be necessary to apply acoustic panels to the walls or use other means to reduce room
reflections.

• If only the green segment of the ERL meter lights, setting the “Effect” parameter to 1 or 2 should

be optimum, but if the yellow segment of the ERL meter lights an “Effect” setting of 3 or 4 will be
required to produce the best results. Since the actual effectiveness of the processing will
depend on the rooms in which it is used it is important make adjustments while actually
connected to and conferring with the remote location.

• If the input signal becomes distorted for any reason before it reaches the Near-end Mic. 1 – 4

inputs of the AEC component, echo cancelling will not function properly.

7 Enter the microphone-to-speaker distance in meters into the Acoustic

Echo Canceller section “Distance” field.

If multiple speakers are used, enter the distance between the microphone and nearest
speaker for each channel.
If the distance is less than 2 meters, use the default value of “2”. For greater distances
enter the appropriate value.

MY4-AEC Owner’s Manual 17

Remote Connection and Settings

Meeting Room (Near End)

Microphone 1

Speaker 1

OUT

(Analog)

IN/OUT (Analog)

IN (Analog)

Office X

(Remote –

Far End)

Network

Teleconferencing system

Microphone 2

Microphone 3

Microphone 4

DME24N

MY4-AEC

+

Speaker 2

1 Connect the microphones, speakers, and teleconferencing system to the

analog [IN] and [OUT] connectors on the rear panel of the DME24N as
shown in the diagram.

Four microphones can be connected at the near-end location, allowing multiple
conference participants.

18 MY4-AEC Owner’s Manual

2 Make the required virtual connections in the DME Designer configuration

HINT

window.

• Connect the signal from the four local microphones (Mic1 – Mic4) and the audio signal

from the remote location (From Office X) to the appropriate inputs of the AEC
component.

• Mix the “Near-end Voice 1” – “Near-end Voice 4” outputs and the “Far-end Voice A”

outputs from the AEC component and connect the mixed output in parallel to the
meeting room speakers (SP 1 and SP 2).

• Mix the “To Far-end 1” – “To Far-end 4” outputs from the AEC component and connect

the mixed output to “To Office X” for transmission to the remote location.

When multiple speakers are being used in the local meeting room, be sure to connect the
mixed signal to them in parallel. AEC may not function properly if the output balance
between the speakers changes.

MY4-AEC Owner’s Manual 19

3 Adjust the DME Designer AEC component editor parameters so that

acoustic echo is effectively cancelled from the audio signal sent to Office
X.

Begin by checking that the connection with Office X is working properly and that
conversation is possible. If echo can be heard with the default AEC section Effect setting
of “1”, try increasing the setting in small increments. Echo cancellation efficiency will
increase as the setting is increased, but sound quality will decrease at the same time so it
is necessary to find the best setting for conditions in the local meeting room while actually
listening to the audio signal.
Other parameters can usually be left at their default settings. Refer to the DME Designer
owner’s manual for details on the individual AEC component parameters.

20 MY4-AEC Owner’s Manual

Example 2: Teleconferencing with Two Remote Locations from Two Meeting Rooms

Using one MY4-AEC card, multiple participants in two meeting rooms can teleconference with
two separate remote locations (“Office X” and “Office Y”).

Preparation

Referring to Example 1, use an oscillator component to determine the ideal microphone and
speaker positions for each meeting room.

The following equipment is used.

 DME24N x 1

 MY4-AEC x 1

 Microphones x 4

 Speakers x 4

Remote Connection and Settings

1 Connect the microphones, speakers, and teleconferencing system to the

analog [IN] and [OUT] connectors on the rear panel of the DME24N as
shown in the diagram.

A total of four microphones can be connected for the medium and small near-end meeting
rooms, allowing multiple participants to confer simultaneously in both rooms.

MY4-AEC Owner’s Manual 21

Network

Network

Office X

(Remote –

Far End)

Office Y

(Remote –

Far End)

Teleconferencing

system

Teleconferencing

system

OUT (Analog)

IN/OUT

(Analog)

Small Meeting Room (Near End)

Microphone 1

Speaker 1

Speaker 2

IN (Analog)

Microphone 2

Medium Meeting Room (Near End)

DME24N

MY4-AEC

+

Microphone 1

Microphone 2

Speaker 1

Speaker 2

OUT (Analog)

IN/OUT

(Analog)

IN (Analog)

22 MY4-AEC Owner’s Manual

2 Make the required virtual connections in the DME Designer configuration

HINT

window.

• Connect the signal from the microphones in the small and medium local meeting rooms

(Conf S Mic1/2 and Conf M – Mic1/2) and the audio signal from the remote locations
(From Office X and From Office Y) to the appropriate inputs of the AEC component.

• Mix the “Near-end Voice 1” and “Near-end Voice 2” outputs and the “Far-end Voice A”

outputs from the AEC component and connect the mixed output in parallel to the small
meeting room speakers (Conf S SP 1 and SP 2).

• Mix the “Near-end Voice 3” and “Near-end Voice 4” outputs and the “Far-end Voice B”

outputs from the AEC component and connect the mixed output in parallel to the
medium meeting room speakers (Conf M SP 1 and SP 2).

• Mix the “To Far-end 1” and “To Far-end 2” outputs from the AEC component and connect

the mixed output to “To Office X” for transmission to remote Office X.

• Mix the “To Far-end 3” and “To Far-end 4” outputs from the AEC component and connect

the mixed output to “To Office Y” for transmission to remote Office Y.

When multiple speakers are being used in the same meeting room, be sure to connect the
mixed signal to them in parallel. AEC may not function properly if the output balance
between the speakers changes.

MY4-AEC Owner’s Manual 23

3 In the Matrix Router section of the AEC component editor, select one or

From
Far-end A

From
Far-end B

more of the “From Far-end A – D signals” to be used as the reference for
each AEC channel 1 – 4.

The “On” buttons in the Matrix Router section can be used to select microphones and
locations for each meeting room.
For this example the Matrix Router is set as shown below. With these settings it is possible
to simultaneously hold independent conferences between the small meeting room and
Office X (Far-end A) using AEC channels 1 and 2, and between the medium meeting room
and Office Y (Far-end B) using AEC channels 3 and 4.

24 MY4-AEC Owner’s Manual

Appendix

Specifications

 GENERAL SPECIFICATIONS

Sampling Frequency 44.1kHz-10% to 48kHz+6%,

Power requirements 5V : 395mA

Temperature Range Operating 0 to +40°C

Storage -20 to +60°C

Weight 160g

 DIGITAL INPUT/OUTPUT CHARACTERISTICS

Terminal Format Audio Data Length Level Connector

IN 1/2, 3/4 AES/EBU 24bit RS422 Euroblock

OUT 1/2, 3/4 AES/EBU

(Professional use)

88.2kHz-10% to 96kHz+6%

3.3V : 295mA

24bit RS422 Euroblock

MY4-AEC Owner’s Manual 183

Dimensions

unit: mm

120

164.1

(12)

40

176.1

184 MY4-AEC Owner’s Manual

* Specifications and descriptions in this owner’s manual are for information pur poses only. Yamaha Corp.

reserves the right to change or modify products or specifications at any time without prior notice. Since
specifications, equipment or options may not be the same in every locale, please check with your Yamaha
dealer.

* Die technischen Daten und Beschreibungen in dieser Bedienungsanleitung dienen nur der Information.

Yamaha Corp. behält sich das Recht vor, Produkte oder deren technische Daten jederzeit ohne vorherige
Ankündigung zu verändern oder zu modifizieren. Da die technischen Daten, das Gerät selbst oder
Sonderzubehör nicht in jedem Land gleich sind, setzen Sie sich im Zweifel bitte mit Ihrem Yamaha-Händler in
Verbindung.

* Les caractéristiques techniques et les descriptions du mode d’emploi ne sont données que pour information.

Yamaha Corp. se réserve le droit de changer ou modifier les produits et leurs caractéristiques techniques à
tout moment sans aucun avis. Du fait que les caractéristiques techniques, les équipements et les options
peuvent différer d’un pays à l’autre, adressez-vous au distributeur Yamaha le plus proche.

* Las especificaciones y descripciones de este manual del propietario tienen sólo el propósito de servir como

información. Yamaha Corp. se reserva el derecho a efectuar cambios o modificaciones en los productos o
especificaciones en cualquier momento sin previo aviso. Puesto que las especificaciones, equipos u
opciones pueden no ser las mismas en todos los mercados, solicite información a su distribuidor Yamaha.

* Le specifiche e le descrizioni presenti in questo manuale sono fornite a fini puramente informativi. Yamaha

Corp. si riserva il diritto di modificare prodotti o specifiche in qualsiasi momento senza preavviso. Dato che le
specifiche, le apparecchiature o le opzioni possono essere diverse da paese a paese, verificarle con il proprio
rappresentante Yamaha.

* 仕様および外観は改良のため、予告なく変更することがあります。

MY4-AEC Owner’s Manual 185

Memo

186 MY4-AEC Owner’s Manual

Memo

MY4-AEC Owner’s Manual 187

188 MY4-AEC Owner’s Manual

MY4-AEC Owner’s Manual 189

For details of products, please contact your nearest Yamaha
representative or the authorized distributor listed below.

Pour plus de détails sur les produits, veuille z-vous adresser à
Yamaha ou au distributeur le plus proche de vous figurant dans
la liste suivante.

NORTH AMERICA

CANA DA

Yamaha Canada Music Ltd.

135 Milner Avenue, Scarborough,
Ontario,
M1S 3R1, Canada
Tel: [phone]

U.S.A .

Yamaha Corporation of America

6600 Orangethorpe Ave., Buena Park,
Calif. 90620, U.S.A.
Tel: [phone]

CENTRAL & SOUTH AMERICA

MEXICO

Yamaha de México S.A. de C.V.

Calz. Javier Rojo Gómez #1149,
Col. Guadalupe del Moral
C.P. 09300, México, D.F., México
Tel: [phone]

BRAZIL

Yamaha Musical do Brasil Ltda.

Rua Joaquim Floriano, 913 - 4' andar,
Itaim Bibi, CEP 04534-013 Sao Paulo,
SP. BRAZIL
Tel: [phone]

ARGENTINA

Yamaha Music Latin America, S.A.
Sucursal de Argentina

Olga Cossettini 1553, Piso 4 Norte
Madero Este-C1107CEK
Buenos Aires, Argentina
Tel: [phone]

PANAMA AND OTHER LATIN
AMERICAN COUNTRIES/
CARIBBEAN COUNTRIES

Yamaha Music Latin America, S.A.

Torre Banco General, Piso 7,
Urbanización Marbella,
Calle 47 y Aquilino de la Guardia,
Ciudad de Panamá, Panamá
Tel: [phone]

THE UNITED KINGDAM/IRELAND

Yamaha Music Europe GmbH (UK)

Sherbourne Drive, Tilbrook, Milton
Keynes,
MK7 8BL, England
Tel: [phone]

GERMANY

Yamaha Music Europe GmbH

Siemensstraße 22-34, 25462
Rellingen, Germany
Tel: [phone]

SWITZERLAND/LIECHTENSTEIN

Yamaha Music Europe GmbH
Branch Switzerland in Zürich

Seefeldstrasse 94, 8008 Zürich,
Switzerland
Tel: [phone]

AUSTRIA/BULGARIA

Yamaha Music Europe GmbH
Branch Austria

Schleiergasse 20, A-1100 Wien,
Austria
Tel: [phone]

CZECH REPUBLIC/HUNGARY/
ROMANIA/SLOVAKIA/SLOVENIA

Yamaha Music Europe GmbH
Branch Austria (Central Eastern
Europe Office)

Schleiergasse 20, A-1100 Wien,
Austria
Tel: [phone]

POLAND/LITHUANIA/LATVIA/
ESTONIA

Yamaha Music Europe GmbH
Branch Sp.z o.o. Oddzial w Polsce

ul. 17 Stycznia 56, PL-02-146
Warsz awa, Pola nd
Tel: [phone]

Die Einzelheiten zu Produkten sind bei Ihrer unten aufgeführten
Niederlassung und bei Yamaha Vertragshändlern in den
jeweiligen Bestimmungsländern erhält lich.

Para detalles sobre productos, contacte su tiend a Yamaha más
cercana o el distribuidor autorizado que se lista debajo .

EUROPE

MARTA

Olimpus Music Ltd.

The Emporium, Level 3, St. Louis
Street Msida
MSD06
Tel: [phone]

THE NETHERLANDS/
BELGIUM/LUXEMBOURG

Yamaha Music Europe Branch
Benelux

Clarissenhof 5-b, 4133 AB Vianen,
The Netherlands
Tel: [phone]

FRANCE

Yamaha Music Europe

BP 70-77312 Marne-la-Vallée Cedex
2, France
Tel: [phone]

ITALY

Yamaha Music Europe GmbH,
Branch Italy

Viale Italia 88, 20020 Lainate (Milano),
Italy
Tel: [phone]

SPAIN/PORTUGAL

Yamaha Music Europe GmbH
Ibérica, Sucursal en España

Ctra. de la Coruna km. 17, 200, 28230
Las Rozas (Madrid), Spain
Tel: [phone]

GREECE

Philippos Nakas S.A. The Music House

147 Skiathou Street, 112-55 Athens,
Greece
Tel: [phone]

SWEDEN/FINLAND/ICELAND

Yamaha Music Europe GmbH
Germany filial
Scandinavia

J. A. Wettergrens Gata 1, Box 30053
S-400 43 Göteborg, Sweden
Tel: [phone]

190 MY4-AEC Owner’s Manual

DENMARK

Yamaha Music Europe GmbH,
Tyskland – filial
Denmark

Generatorvej 6A, DK-2730 Herlev,
Denmark
Tel: [phone]

NORWAY

Yamaha Music Europe GmbH
Germany - Norwegian Branch

Grini Næringspark 1, N-1345 Østerås,
Norway
Tel: [phone]

RUSSIA

Yamaha Music (Russia)

Room 37, bld. 7, Kievskaya street,
Moscow,
121059, Russia
Tel: [phone]

OTHER EUROPEAN COUNTRIES

Yamaha Music Europe GmbH

Siemensstraße 22-34, 25462
Rellingen, Germany
Tel: [phone]

AFRICA

Yamaha Corporation,
Asia-Pacific Sales & Marketing
Group

Nakazawa-cho 10-1, Naka-ku,
Hamamatsu,
Japan 430-8650
Tel: [phone]

MIDDLE EAST

TURKEY/CYPRUS

Yamaha Music Europe GmbH

Siemensstraße 22-34, 25462
Rellingen, Germany
Tel: [phone]

PA2 9

OTHER COUNTRIES

Yamaha Music Gulf FZE

LOB 16-513, P.O.Box 17328, Jubel Ali,
Dubai, United Arab Emirates
Tel: [phone]

ASIA

THE PEOPLE’S REPUBLIC OF CHINA

Yamaha Music & Electronics
(China) Co.,Ltd.

2F, Yunhedasha, 1818 Xinzha-lu,
Jingan-qu,
Shanghai, China
Tel: [phone]

INDIA

Yamaha Music India Pvt. Ltd.

5F Ambience Corporate Tower Ambience
Mall Complex
Ambience Island, NH -8, Gurgaon-122001,
Haryana, India
Tel: [phone]

INDONESIA

PT. Yamaha Musik Indonesia
(Distributor)
PT. Nusantik

Gedung Yamaha Music Center, Jalan
Jend. Gatot Subroto Kav. 4, Jakarta
12930, Indonesia
Tel: [phone]

KOREA

Yamaha Music Korea Ltd.

8F, 9F, Dongsung Bldg. 158-9
Samsung-Dong, Kangnam-Gu,
Seoul, Korea
Tel: [phone]

MALAYSIA

Yamaha Music (Malaysia) Sdn., Bhd.

Lot 8, Jalan Perbandaran, 47301
Kelana Jaya, Petaling Jaya, Selangor,
Malaysia
Tel: [phone]

HEAD OFFICE Yamaha Corporation, Pro Audio Division

Nakazawa-cho 10-1, Naka-ku, Hamamatsu, Japan 430- 8650
Tel: [phone]

SINGAPORE

Yamaha Music (Asia) Pte., Ltd.

#03-11 A-Z Building
140 Paya Lebor Road, Singapore
409015
Tel: [phone]

TAI WAN

Yamaha KHS Music Co., Ltd.

3F, #6, Sec.2, Nan Jing E. Rd. Taipei.
Taiwan 104, R.O.C.
Tel: [phone]

THAILAND

Siam Music Yamaha Co., Ltd.

4, 6, 15 and 16th floor, Siam Motors
Building,
891/1 Rama 1 Road, Wangmai,
Pathumwan, Bangkok 10330,
Thailand
Tel: [phone]

OTHER ASIAN COUNTRIES

Yamaha Corporation,
Asia-Pacific Sales & Marketing
Group

Nakazawa-cho 10-1, Naka-ku,
Hamamatsu,
Japan 430-8650
Tel: [phone]

AUSTR ALIA

Yamaha Music Australia Pty. Ltd.

Level 1, 99 Queensbridge Street,
Southbank,
Victoria 3006, Australia
Tel: [phone]

COUNTRIES AND TRUST
TERRITORIES IN PACIFIC OCEAN

Yamaha Corporation,
Asia-Pacific Sales & Marketing
Group

Nakazawa-cho 10-1, Naka-ku,
Hamamatsu,
Japan 430-8650
Tel: [phone]

OCEANIA

MY4-AEC Owner’s Manual 191

Yamaha Pro Audio global web site

http://www.yamahaproaudio.com/

Yamaha Manual Library

http://www.yamaha.co.jp/manual/

C.S.G., Pro Audio Division

© 2011 Yamaha Corporation

109MWTO-A0

Printed in Japan

WW75420