Yamaha EMX640 User Manual

POWERED MIXER

Owner’s Manual

Introduction

Thank you for purchasing the Yamaha EMX640 Powered Mixer. The EMX640 has the following features.
In order to take full advantage of the EMX640 and enjoy long and trouble-free performance, please read this
owner’s manual carefully, and keep it in a safe place for future reference.

Features

• Six input channels compatible with mic/line signals are
provided. The EMX640 has ample power, with a maximum
output of 200 W+200 W (400 W with bridge connection),
and is suitable for a wide range of applications from installed
systems to small-scale PA systems.

• A two-channel power amp is built-in. The input signals for
the two channels can be selected as MAIN+MAIN,
MAIN+MONITOR, or MAIN (bridge connection).

• Independent 7-band graphic EQ is provided for both the
MONITOR section and the MAIN section. This allows the
volume and frequency response to be adjusted separately for
the main speakers and monitor speakers.

• Two limiter circuits are built-in to prevent excessive input
levels to the amp.

• A digital effect with three selectable effect types is built-in.
A variety of effects can be applied to add reverberation or
ambiance to vocals or instrumental sounds.

Precautions

1. Avoid excessive heat, humidity, dust and vibration

Keep the unit away from locations where it is likely to be
exposed to high temperatures or humidity — such as near
radiators, stoves, etc. Also avoid locations which are subject
to excessive dust accumulation or vibration which could
cause mechanical damage.

2. Ventilation

Allow a distance of 30 cm between the unit and the wall so
that heat generated from the unit will be released effectively.
Also, allow enough space between the unit and other devices.
If you mount the unit in an audio rack, keep a space of 40
cm on the top panel, and a space of 15 cm to the side panel.
Remove the rear panel of the rack or open a vent hole. If heat
release is inadequate, the unit will retain heat inside the unit,
which may cause a fire.

3. A void physical shocks

Strong physical shocks to the unit can cause damage. Handle
it with care.

4. Do not open the case or attempt repairs or modifications
yourself

This product contains no user-serviceable parts. Refer all

Contents

Front and rear panel ............................................2

Control panel .......................................................... 2

Input/output panel .................................................. 6

Rear panel .............................................................. 7

Connections.........................................................8

Basic Operation ...................................................9

Connecting microphones and instruments ............ 9

Using the digital effect............................................ 9

Example setups .................................................10

As a conference PA system/installed sound system 10

As a band PA........................................................ 11

Specifications.....................................................13

General specifications.......................................... 13

Input specifications............................................... 14

Output specifications............................................ 14

Dimensions........................................................... 15

Block and Level diagram ...................................... 15

maintenance to qualified Yamaha service personnel. Opening
the case and/or tampering with the internal circuitry voids
the warranty.

5. Always power off before making connections

Always turn the power OFF before connecting or
disconnecting cables. This is important to prevent damage to
the unit itself as well as other connected equipment.

6. Handle cables carefully

Always plug and unplug cables — including the AC power
cord — by gripping the connector, not the cord.

7. Clean with a soft dry cloth

Never use solvents such as benzine or thinner to clean the
unit. Wipe clean with a soft, dry cloth.

8. Always use the correct power supply

Make sure that the power supply voltage specified on the rear
panel matches your local AC mains supply. Also make sure
that the AC mains supply can deliver more than enough
current to handle all equipment used in your system.

9. Do not touch the heatsink when the EMX640 is in use.
It can get very hot.

E

Front and rear panel

2

Front and rear panel

Control panel

■

Channel section

In this section, you can adjust equalization (fre­quency response), volume level, effect and moni­tor output levels for the input signal of each
channel.

1

HIGH

–15 +15

MID

1

–15 +15

LOW

–15 +15

MONI

2

010

EFFECT

3

010

LEVEL

4

010

PAD

5

1

1

Equalizer controls (HIGH, MID, LOW)

This is a 3-band equalizer that adjusts the high
frequency range, mid frequency range, and low
frequency range of each channel. Response is flat
when the knobs are in the
toward the right will boost the corresponding fre­quency band, and rotating it toward the left will
cut it.

The base frequency (or center frequency), range
of boost or cut, and equalizer type of each band
are as follows.

HIGH: 12 kHz±15 dB shelving type
MID: 2.5 kHz±15 dB peaking type
LOW: 80 Hz

▼

position. Rotating it

±

15 dB shelving type

Monitor controls (MONI)

2

For each channel, this controls the amount of sig­nal that is sent to the MONITOR bus.

The signal of the MONITOR bus is sent to the
speakers connected to the POWER AMP 2 A/B
jacks (only if the power amp select switch is in the
MAIN+MONITOR position) and to the MONI­TOR jacks (input/output panel 6 ).

Note: The signal is sent to the MONITOR bus

from a location before the level control ( 4 ) of
each channel. This means that it will not be af­fected by the setting of the LEVEL control.

Effect control (EFFECT)

3

For each channel, this controls the amount of sig­nal that is sent to the EFFECT bus.

The signal of the EFFECT bus passes through the
EFFECT section and the built-in effect, and is
sent to the external effect device connected to the
EFFECT OUT jacks (input/output panel 3).

Note:

The signal is sent to the EFFECT bus
from a location after the level control (4) of
each channel. This means that the amount of
signal that is sent to the EFFECT bus will be af­fected not only by the setting of the effect con­trol, but also by the setting of the level control.

4

Level control (LEVEL)

This adjusts the output level for each channel.

5

Pad switch (PAD) (1~4 only)

This switch attenuates the input signal by 30 dB.
When connecting a line level device to channels
1~4, or if the mic input is distorted, turn this
switch on (the pressed-in position).

EMX640—Owner’s Manual

■

DIGITAL EFFECT section

This section allows you to turn the built-in digital
effect on/off and to select the effect type.

VOCAL

L HALL

S HALL

ON

DIGITAL
EFFECT

6

Effect select switch

Select the effect type for the built-in digital effect.

DIGITAL EFFECT ON switch

7

When this switch is on (pressed), the digital effect
built into the EMX640 can be used. In that case,
the signal processed by the digital effect will be
sent to the MAIN/MONITOR bus. The mix level
of the effect sound is adjusted by the EFFECT
RTN control of the MAIN and MONITOR sec­tions.

6

7

Control panel

■

EFFECT section

This section allows you to adjust the level of the
signal sent from the EFFECT bus to an external
effect device.

8

EFFECT OUT

EFFECT

8

EFFECT OUT control

This adjusts the effect send level for an external
effect device connected to the EFFECT OUT jack
(input/output panel 3 ).

Note: The EFFECT OUT control does not affect

the send level to the built-in effect.

3

EMX640—Owner’s Manual

Front and rear panel

4

■

MONITOR section

■

MAIN section

This section allows you to adjust the tone and
volume of the MONITOR bus, and specify the
mix level of the built-in effect.

9

+12

–12

•

6

•

0

•

6

•

125

250 500 1k 2k 4k 8k

+12

–12

•

6

•

0

•

6

•

–10

0

EFFECT RTN

MONITOR

Graphic equalizer

9

This is a 7-band graphic equalizer that allows you
to adjust the frequency response of the MONI­TOR bus signal, providing a maximum of ±12 dB
of cut/boost for each frequency band. You can use
these sliders to reduce the level of frequency
bands at which feedback easily occurs. Frequency
response is flat when a slider is in the center posi­tion. Moving a slider in the positive direction will
boost, and in the negative direction will cut.

This graphic equalizer affects both the MONI­TOR bus signal that is output to the speakers and
the line level signal which is output from the
MONITOR jack (input/output panel 6).

0

EFFECT RTN control

This controls the level of the effect sound which
is returned from the built-in digital effect to the
MONITOR bus.

MASTER control

A

This adjusts the final level of the MONITOR bus.
It affects both the MONITOR bus signal which is
output to the speakers and the line level signal
which is output to the MONITOR jack (input/
output panel 6 ).

Peak level indicator

B

This indicator allows you to monitor the level of
the signal which is output from the MONITOR
jack (input/output panel 6).

Note: To avoid distortion, adjust the MASTER

control ( A ) so that the 0 indicator lights occa­sionally.

MASTER

This section allows you to adjust the tone and
volume of the MAIN bus, the mix level of the
built-in effect, and the mix level of the external
input.

+6

+12

•

6

+6
+3

0

B

–5

C

–12

•

0

•

6

•

125

250 500 1k 2k 4k 8k

+12

–12

•

+3

6

•

0

0

•

6

•

–5

–10

H

G

A

AUX INEFFECT RTN

D

Graphic equalizer

C

E

This is a 7-band graphic equalizer that allows you
to adjust the frequency response of the MAIN
bus signal, providing a maximum of
cut/boost for each frequency band.

This graphic equalizer affects both the MAIN bus
signal that is output to the speakers and the line
level signal which is output from the MAIN jack
(input/output panel 6).

EFFECT RTN control

D

This adjusts the level of the effect signal which is
returned from the built-in digital effect to the
MAIN bus.

E

AUX IN control

This adjusts the amount of signal that is sent
from the AUX IN jack to the MAIN bus.

F

TAPE IN

This adjusts the amount of signal that is sent
from the TAPE IN jacks to the MAIN bus.

G

MASTER control

This adjusts the final level of the MAIN bus. It
affects both the MAIN bus signal which is output
from the speakers, and the line level signal which
is output from the MAIN jack (input/output
panel 6).

H

Peak level indicator

This indicator allows you to monitor the level of
the signal which is output from the MAIN jack
(input/output panel 6 ).

Note: To avoid distortion, adjust the MASTER

control ( G ) so that the 0 indicator lights occa­sionally.

MAIN

TAPE IN

F

MASTER

±

12 dB of

EMX640—Owner’s Manual

■

POWER AMP section

This section allows you to select the signals that
will be output from the built-in two-channel
power amplifier, and to select the BRIDGE mode.

I

1

MAIN
MAIN

LIMITER

BRIDGE

MAIN

2

MAIN
MONITOR

J

POWER AMP

LIMITER indicator

I

This indicator lights up when the level of the sig­nal output from the power amp section reaches
the maximum and the limiter is activated. Adjust
appropriate control so that the indicator lights up
for only a short while when the signal reaches the
maximum level.

Control panel

■

POWER indicator & PHANTOM

switch

K

K

POWER indicator

This indicator will light when the power of the
EMX640 is turned on.

PHANTOM +48 V switch

L

This switch turns the phantom power supply on/
off for the Lo-Z input jacks of channels 1~4 and
MIC input jacks of channels 5~6.

ON

OFF

L

POWER

PHANTOM +48V

5

Note: The indicator lights up or flashes for a

longer duration if the power amp section is sig­nificantly overloaded, which could result in
malfunction. Avoid such a situation.

Power amp select switch

J

Select one of the following three settings to spec­ify the signals that will be output from power
amp 1/2.

• MAIN-MONITOR

With this setting, the MAIN and MONITOR sec­tions can be used independently. The MAIN bus
signal will be output from the POWER AMP 1 A/
B jacks, and the MONITOR bus signal will be
output from the POWER AMP 2 A/B jacks.

•

MAIN-MAIN

With this setting, the two power amp channels
can be used independently. The MAIN bus signal
will be output from the POWER AMP 1 A/B jacks
and from the POWER AMP 2 A/B jacks.

• MAIN BRIDGE

With this setting, the two power amp channels (A
and B) will be bridge connected. Only the MAIN
bus signal will be output from the BRIDGE jack,
though.

EMX640—Owner’s Manual

Front and rear panel

6

Input/output panel

1

Hi-Z

1

1

Lo-Z

Channel input jacks (Hi-Z, Lo-Z) 1~4

Hi-Z

Lo-Z

Hi-Z

Lo-Z

LINEHi-Z LINE

MIC MICLo-Z

These are the input jacks for channels 1~4. By
using the PAD switches (control panel 5 ) you
can connect any of the jacks to a wide range of
sources from mics to line level devices (synthesiz­ers or rhythm boxes etc.). The Lo-Z jacks can
provide +48 V phantom power, allowing you to
use condenser microphones.

Both Hi-Z and Lo-Z are balanced, and are com­patible with microphones of output impedance
50~600Ω or line level devices of 600Ω. The nom­inal input level is –40 dB~–10 dB for the Hi-Z
jacks, and –50 dB~–20 dB for the Lo-Z jacks.

Pin connections for the Hi-Z and Lo-Z jacks are
as follows.

Lo-Z jacks
(XLR type)

Hi-Z jacks

(TRS phone jacks)

Pin 1: ground Sleeve: ground

Pin 2: hot (+) Tip: hot (+)

Pin 3: cold (–) Ring: cold (–)

RST

+-

GND

GND

Note: It is not possible to simultaneously use
both the Hi-Z and Lo-Z inputs of a given chan­nel. For each channel, use only one of the inputs
as appropriate for the input source.

Phantom power is switched on/off in simulta­neously for channels 1~6. For this reason,
devices which do not require phantom power
must be connected to the Hi-Z or LINE jacks if
the PHANTOM +48 V switch (control panel

L) is on.

1

2

2

2

EFFECT OUT

FOOT SW

43

2

REC

TAPE

OUT

IN

AUX IN

SEE REAR PANEL CAUTION

INPUT TO MAIN OUTPUT

5 6

Channel input jacks (MIC/LINE) 5~6

MONITOR

MAIN

These are the input jacks for channels 5~6.
Microphones can be connected to the MIC jacks,
and stereo line level devices (such as synthesizers
or rhythm boxes) can be connected to the LINE
jacks.

The MIC jacks are balanced, and are compatible
with microphones of output impedance
50~600Ω. The LINE jacks are unbalanced, and
are compatible with line level devices of 600Ω
output impedance. Nominal input level is –50 dB
for the MIC jacks and –20 dB for the LINE jacks.

Note: It is possible to simultaneously use both
the MIC and LINE inputs for a given channel.

Effect output jack (EFFECT OUT)

3

The input of an external effect such as a delay or
echo can be connected to this jack. The signal
adjusted by the EFFECT control of each channel
will be sent to the EFFECT bus, its level adjusted
by the EFFECT OUT control, and output from
this jack.

The nominal output level and impedance are
+4 dB/10 kΩ.

4

Foot switch jack (FOOT SW)

+-

A separately sold Yamaha FC5 foot switch can be
connected to this jack. If a foot switch is con­nected to this jack, you can use your foot to
switch the built-in digital effect on/off. The Digi­tal Effect ON switch on the front panel must be
set to ON in order to use a foot switch.

External input jacks (AUX IN/TAPE IN)

5

These are input jacks that allow the signal from
an external device to be added to the MAIN out­put. Monaural output devices such as external
effects can be connected to the AUX IN jack, and
stereo output devices such as cassette recorder or
CD players can be connected to the TAPE IN
jacks.

EMX640—Owner’s Manual

Rear panel 7

The nominal input level and impedance are –

10 dB/600Ω for the AUX IN jack, and –10 dBV/
600Ω for the TAPE IN jacks.

6 External output jacks (REC OUT/MONI-

TOR/MAIN)

These are output jacks which send line level sig­nals from the EMX640 to external devices. A ste­reo recording device such as a cassette recorder or
MD recorder can be connected to the REC OUT
jacks, and a playback device such a power amp
can be connected to the MONITOR and MAIN
jacks. The signals sent from each jack are as fol­lows.

Rear panel

• REC OUT jacks: The MAIN bus signal

before it has passed through the MASTER
control and graphic equalizer

• MONITOR jack: The MONITOR bus signal

which has passed through the Monitor MAS­TER control and graphic equalizer

• MAIN jack: The MAIN bus signal which has

passed through the Main MASTER control
and graphic equalizer

The nominal output level and impedance are –

10 dBV/10 kΩ for the REC OUT jacks, and
+4 dB/10 kΩ for the MONITOR/MAIN jacks.

1

BA B

1 Speaker output jacks (POWER AMP 1 A/B,

POWER AMP 2 A/B, BRIDGE)

Speakers can be connected to these jacks. The
EMX640 contains a two-channel power amp, and
the two channels can be used independently
(maximum output 200 W+200 W) or in bridge
connection (maximum output 400 W).

If the two channels are used independently, two
speakers can be connected to the POWER AMP 1
A/B jacks and two more to the POWER AMP 2 A/
B jacks, for a total of four speakers. If the two
channels are used in a bridge connection, only
one speaker can be connected to the BRIDGE
jack.

If you wish to use the two channels indepen­dently, but only connect a speaker to the A jack or

B jack, use a 4~8Ω speaker. When using the A
and B jacks simultaneously, connect 8~16Ω

speakers. In this case, be careful not to connect a
speaker to the BRIDGE jack.

SPEAKERS

POWER

ON / OFF

A

POWER AMP 1BRIDGEPOWER AMP 2

2

If you are connecting a speaker to the BRIDGE

jack, use a 8~16Ω speaker. In this case, be careful

not to connect a speaker to the POWER AMP 1/2
A/B jacks.

Note: Use the power amp select switch (control
panel J) to select the signal which is sent to the
jacks, or to activate the bridge connection.

Caution:
When using a bridge connection, do not con­nect anything to the POWER AMP 1 and
POWER AMP 2 jacks. Likewise, when using the
POWER AMP 1 and/or POWER AMP 2 jacks,
do not connect anything to the BRIDGE jack.

2 Power switch

This switch turns the power of the EMX640 on/
off.

Note: Before turning the EMX640 on/off, turn
down the MASTER controls of the MONITOR
and MAIN section.

EMX640—Owner’s Manual

8 Connections

Connections

When connecting various devices, be sure to use cables and plugs of the appropriate standard.

■ Speaker connection

There are three ways in which speakers can be connected to the EMX640; a single speaker each can be con­nected to either the A or the B jack of POWER AMP 1 and of POWER AMP 2, two speakers can be connected
in parallel to both the A and B jacks of POWER AMP 1 and of POWER AMP 2, or a single speaker can be con­nected to the BRIDGE jack (bridge connection). For each of these, the required speaker impedance will differ.
Refer to the following diagram, and make sure that the speaker impedance is not less than the specified value.

Connecting speakers to

either the A or B jacks

of POWER AMP 1/2

BA B

4Ω~8Ω 4Ω~8Ω

Main/Monitor

Speaker

SPEAKERS

POWER

ON / OFF

A

POWER AMP 1BRIDGEPOWER AMP 2

Main

Speaker

■ Example connections

Synthesizer, Drum Box

Connecting speakers to

both the A and B jacks

of POWER AMP 1/2

BA B

8Ω~16Ω 8Ω~16Ω

Main/Monitor

Speakers

Effects Processor

88

SPEAKERS

POWER

ON / OFF

POWER AMP 1BRIDGEPOWER AMP 2

Main

Speakers

Connecting a single speaker

to the BRIDGE jack

(bridge connection)

A

BA B

Monitors Speakers

SPEAKERS

POWER

ON / OFF

8Ω~16Ω

Main

Speaker

A

POWER AMP 1BRIDGEPOWER AMP 2

Power AMP

1

Hi-Z

Hi-Z

Hi-Z

Lo-Z

Lo-Z

Lo-Z

1

2

LINEHi-Z LINE

MIC MICLo-Z

2

EFFECT OUT

FOOT SW

SEE REAR PANEL CAUTION

MONITOR

REC

TAPE

OUT

IN

AUX IN

INPUT TO MAIN OUTPUT

MAIN

Footswitch

Microphone

(YAMAHA FC5)

Main Speakers

CD Player

Cassette Recorder

• Additional, or alternative amplifiers can be connected to the MAIN and MONITOR jacks on the front panel.

EMX640—Owner’s Manual

Basic Operation

This section explains basic operation of the EMX640.

Connecting microphones and instruments

Basic Operation 9

1 Before connecting mics or instruments,

make sure that the power of all equip­ment (where applicable) is turned off.
Also make sure that the level controls of
each channel of the EMX640 and the
MASTER control of the MAIN section are
turned down.

2 Connect cables to your mics and instru-

ments, and insert the other end of the
cable firmly into the appropriate Lo-Z/Hi­Z jack (channels 1~4) or the MIC/LINE
jack (channels 5~6).

Note: When connecting a line level device to
channels 1~4, turn on the PAD switch.

You cannot use a channel’s Lo-Z and Hi-Z jacks
at the same time. The MIC and LINE jacks,
however, can be used at the same time.

Using the digital effect

3 Turn the power on in the order of periph-

eral devices ➞ EMX640.

Note: When turning the power off, reverse this
sequence.

4 Set the MAIN section MASTER control to

the √√√√ position.

5 While speaking into the mic (while play-

ing the instrument), adjust the channel
LEVEL control so that the 0 LED of the
MAIN section peak level meter lights
occasionally.

6 If you wish to adjust the tone of each

channel, rotate the equalizer controls as
desired.

7 Use the MAIN section graphic equalizer

and MASTER control to adjust the overall
volume and tone.

The EMX640 has a built-in digital effect, allowing reverberation or ambiance to be added to vocals or instru­mental sounds.

1 Connect a mic or instrument to the

desired channels, and adjust the volume
and tone.

2 Press the DIGITAL EFFECT ON switch of

the DIGITAL EFFECT section.

3 Use the effect select switches of the DIGI-

TAL EFFECT section to select the effect
type.

VOCAL....... Reverb appropriate for vocals.

L. HALL...... Reverb typical of a large hall.

S. HALL...... Reverb typical of a small hall.

4 Raise the EFFECT control of the channels

to which you wish to apply the digital
effect.

5 Use the MAIN/MONITOR section EFFECT

RTN control to adjust the level of the
sound processed by the effect.

Note: If the effect sound is distorted even if the
EFFECT RTN turned all the way down, lower
the EFFECT controls of each channel.

EMX640—Owner’s Manual

10 Example setups

Example setups

This section provides some ways in which the EMX640 can be used, and explains connections and operation.

As a conference PA system/installed sound system

Here is an example of using the EMX640 as a conference PA system or as an installed sound system.

Main Speakers

Power AMP 1 A/B Power AMP 2 A/B

23344

1

HIGH

HIGH

HIGH

–15 +15 –15 +15 –15 +15 –15 +15 –15 +15 –15 +15

MID

MID

–15 +15

–15 +15

LOW

LOW

–15 +15

–15 +15

MONI

MONI

010010

EFFECT

EFFECT

010

010

LEVEL

LEVEL

010

010

PAD

PAD

1

2

Hi-Z

Hi-Z

Lo-Z

Lo-Z

MID

–15 +15

LOW

–15 +15

MONI

010

EFFECT

010

LEVEL

010

PAD

Hi-Z

Lo-Z

HIGH

MID

–15 +15

LOW

–15 +15

MONI

EFFECT

LEVEL

PAD

010

010

010

HIGH

MID

LOW

MONI

EFFECT

LEVEL

5

6

HIGH

MID

–15 +15

–15 +15

LOW

–15 +15

–15 +15

MONI

010 010

EFFECT

010

010

LEVEL

010

010

6

5

1

1

LINEHi-Z LINE

MIC MICLo-Z

2

2

+6

TAPE IN

+12

•

6

•

0

•

6

•

–12

+12

•

6

•

0

•

6

•

–12

POWER

+3
0

ON

–5

PHANTOM +48V

OFF

–10

MASTER

+6

1

+3
0

LIMITER

–5

–10

MASTER

AUX IN

AUX IN

INPUT TO MAIN OUTPUT

INPUT TO MAIN OUTPUT

TAPE

TAPE

MAIN

BRIDGE

MAIN
MAIN

MONITOR

REC

REC
OUT

IN

OUT

IN

+12

ON

DIGITAL
EFFECT

•

6

•

0

•

6

•

–12

125

250 500 1k 2k 4k 8k

EFFECT RTN

+12

•

6

•

0

•

6

•

–12

125

250 500 1k 2k 4k 8k

SEE REAR PANEL CAUTION

MONITOR

AUX INEFFECT RTNEFFECT OUT

VOCAL

L HALL

S HALL

EFFECT MAIN POWER AMP

EFFECT OUT

FOOT SW

MAIN
MONITOR

MAIN

MAIN

2

MAIN

BRIDGE

MAIN

MAIN

MONITOR

MAIN

Microphone

Connections

• Connect mics to channel inputs 1~6.

• If you wish to use an external device such as a CD
player or LD player, connect the outputs of the
device to the TAPE IN jacks of the EMX640.

• If you wish to record the audio from the mics to a
cassette deck, connect the REC OUT jacks of the
EMX640 to the input jacks of the cassette deck.

Note: A CD player/cassette deck can also be
connected to the LINE jacks of channels 5~6.

EMX640—Owner’s Manual

CD Player

Cassette Deck

Playing back a CD player

1 Turn the power on in the order of periph-

eral devices ➞ EMX640.

2 Adjust the MASTER control of the MAIN

section to the √√√√ position.

3 Start playback on the CD player, and use

the MAIN section TAPE IN control to
adjust the level so that the 0 LED of the
MAIN section peak level meter does not
light.

As a band PA 11

As a band PA

Here is an example of using the EMX640 as a small PA for a band. In this example, the monitor speakers are
being sent a mix that is independent of the MAIN speaker mix. An external effect such as delay or reverb is
also being used.

Connections

• Connect mics or instruments, such as keyboards,
to the channel input jacks 1~6.

• Connect the main speakers to the POWER AMP
1 A/B jacks, and connect the monitor speakers to
the POWER AMP 2 A/B jacks.

• If you will be using an external effect such as
delay or reverb, connect the EMX640’s EFFECT
OUT jack to the input jack of the external effect,
and connect the output jack of the external effect
to the EMX640’s AUX IN jack.

Main Speakers

Power AMP 1 Power AMP 2AABB

23344

1

HIGH

HIGH

HIGH

–15 +15 –15 +15 –15 +15 –15 +15 –15 +15 –15 +15

MID

MID

–15 +15

–15 +15

LOW

LOW

–15 +15

–15 +15

MONI

MONI

010010

EFFECT

EFFECT

010

010

LEVEL

LEVEL

010

010

PAD

PAD

1

2

Hi-Z

Hi-Z

Lo-Z

Lo-Z

MID

–15 +15

LOW

–15 +15

MONI

010

EFFECT

010

LEVEL

010

PAD

Hi-Z

Lo-Z

HIGH

MID

–15 +15

LOW

–15 +15

MONI

EFFECT

LEVEL

PAD

010

010

LEVEL

010

HIGH

MID

LOW

MONI

EFFECT

5

HIGH

MID

–15 +15

–15 +15

LOW

–15 +15

–15 +15

MONI

010 010

EFFECT

010

LEVEL

010

5

1

1

2

LINEHi-Z LINE

MIC MICLo-Z

Note: Set the power amp select switch of the
POWER AMP section to the “MAIN MONI­TOR” position.

If you are using an external effect, we recom­mend that you turn down the EFFECT RTN
controls of the MAIN and MONITOR sections.

If the external effect has a stereo output, it is
possible to connect its output jacks to the LINE
jacks of channels 5~6. However in this case, be
sure that the EFFECT controls are turned all the
way down for the channels into which the effect
sound is being input. If the EFFECT controls
are raised, feedback will occur, and your speak­ers may be damaged.

Monitors Speakers

6

VOCAL

L HALL

S HALL

010

010

6

EFFECT MAIN POWER AMP

2

EFFECT OUT

FOOT SW

ON

DIGITAL
EFFECT

+12

•

6

•

0

•

6

•

–12

125

250 500 1k 2k 4k 8k

EFFECT RTN

+12

•

6

•

0

•

6

•

–12

125

250 500 1k 2k 4k 8k

SEE REAR PANEL CAUTION

MONITOR

AUX INEFFECT RTNEFFECT OUT

TAPE IN

+12

•

6

•

0

•

6

•

–12

+12

•

6

•

0

•

6

•

–12

+6

POWER

+3
0

ON

–5

PHANTOM +48V

OFF

–10

MASTER

+6

1

+3

0

LIMITER

–5

–10

MASTER

AUX IN

INPUT TO MAIN OUTPUT

INPUT TO MAIN

TAPE

MAIN

BRIDGE

MAIN
MAIN

MONITOR

REC
OUT

IN

MAIN
MONITOR

MAIN

2

MAIN
MAIN

MAIN

BRIDGE

MAIN
MONITOR

Keyboard 1 Microphone

DIDI

Bass

Guitar

Guitar

88

Effects Processor

EMX640—Owner’s Manual

12 Example setups

Sending an independent mix to the
monitor speakers

1 Set the MONITOR section MASTER con-

trol to the √√√√ position.

2 Raise the MONI controls for the channels

that you wish to hear from the monitor
speakers.

Note: The MONI controls are not affected by
the level settings of each channel. This allows
you to create a mix that is independent of the
MAIN section.

3 Use the graphic equalizers and MASTER

controls of the MAIN/MONITOR sections
to adjust the overall volume and tone.

Using an external effect

1 Set the EFFECT section EFFECT OUT con-

trol to the √√√√ position.

2 Raise the EFFECT controls for the channels

to which you want the external effect to
be applied.

3 Adjust the input level of the external

effect so that the sound is not distorted at
the input of the external effect.

4 Use the MAIN section AUX IN control to

adjust the level of the sound processed by
the effect.

EMX640—Owner’s Manual

Specifications

■ General specifications

Maximum output power 200 W/4Ω @0.5% THD at 1 kHz

20 Hz~20 kHz +1 dB, –3 dB @1 W output into 8Ω (POWER AMP OUT)

Frequency response

Total harmonic distortion

Hum & noise
(Average, Rs=150Ω)
(with 20 Hz~20 kHz BPF)

Maximum voltage gain
(PAD: OFF)

Crosstalk at 1 kHz 65 dB adjacent input, 65 dB input to output

Input channel equalization

Meters 5 POINTS LED METER (–10, –5, 0, +3, +6 dB)

Graphic equalizer

Internal digital effect 3 types (Vocal, L Hall, S Hall)

Phantom power

Limiter Comp. : THD≥0.5%

20 Hz~20 kHz +1 dB, –3 dB @+4 dB output into 10 kΩ (MAIN OUT, MONITOR OUT, EFFECT
SEND)

Less than 0.5% @20 Hz~20 kHz, 100 W output into 4Ω (POWER AMP OUT)
Less than 0.2% @20 Hz~20 kHz, +14 dB output into 10 kΩ
(MAIN OUT, MONITOR OUT, EFFECT SEND)

–123 dB equivalent input noise, –65 dB residual output noise
(POWER AMP OUT)

–88 dB residual output noise (MAIN OUT, MONITOR OUT, EFFECT SEND)
–79 dB (83 dB S/N)

MAIN OUT, MONITOR OUT
–69 dB (73 dB S/N)

MAIN OUT, MONITOR OUT
–75 dB (79 dB S/N)

EFFECT SEND
–69 dB (73 dB S/N)

EFFECT SEND
86 dB CH IN (Lo-Z) to POWER AMP OUT (CH1~4)

66 dB CH IN (Lo-Z) to MAIN OUT, MONITOR OUT (CH1~4)
72 dB CH IN (Lo-Z) to EFFECT OUT (CH1~4)
48 dB CH IN (Lo-Z) to REC OUT (CH1~4)
56 dB CH IN (Hi-Z) to MAIN OUT, MONITOR OUT (CH1~4)
26 dB AUX IN to MAIN OUT
22 dB TAPE IN to MAIN OUT
66 dB MIC IN to MAIN OUT, MONITOR OUT (CH5•6)
24 dB LINE IN to MAIN OUT, MONITOR OUT (CH5•6)

±15 dB Maximum

HIGH 12 kHz shelving
MID 2.5 kHz peaking
LOW 80 Hz shelving

* Turn over/roll-off frequency of shelving: 3 dB below maximum variable level.

7 bands (125, 250, 500, 1k, 2k, 4k, 8k Hz)
±12 dB Maximum

+48 V is supplied to electrically balanced inputs for powering condenser microphones via 6.8 kΩ
current limiting/isolation resisters.

Specifications 13

Master level control at nominal level and all channel
level controls at minimum.

Master level control at nominal level and 1 channel
level control at nominal level.

Master level control at nominal level and all channel
level controls at minimum.

Master level control at nominal level and 1 channel
level control at nominal level.

LIMIT indicators Turns on. : THD≥0.5%
Foot switch DIGITAL EFFECT MUTE : on/off

USA and Canada 120 V AC 60 Hz

Power requirement

Power consumption 200 W
Dimensions (WxHxD) 480×275×275 mm
Weight 15 kg

Europe 230 V AC 50 Hz
Other 240 V AC 50 Hz

EMX640—Owner’s Manual

14 Specifications

■ Input specifications

Input connectors PAD

Actual load

impedance

Nominal

impedance

Sensitivity

1

Input level

Nominal level

Max. before

cliping

Connector

type

CH INPUT (Lo-Z)
(CH1~4)

CH INPUT (Hi-Z)
(CH1~4)

MIC INPUT (CH5•6) 3 kΩ 50~600Ω Mics –62 dB (616 µV) –50 dB (2.45 mV) –20 dB (77.5 mV)
LINE INPUT (CH5•6) (1, 2) 10 kΩ 600Ω Line –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V) Phone jack

TAPE IN (1, 2) 10 kΩ 600Ω Line –20 dBV (100 mV) –10 dBV (316 mV) +17.8 dBV (7.75 V) Phono jack
AUX IN 10 kΩ 600Ω Line –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V)

1. Sensitivity is the lowest level that can produce an output of +4 dB (1.23 V) or the nominal output level when the unit is set at maximum gain.
(All level controls are at maximum position.)

• CH INPUT and MIC INPUT connectors are balanced and others are unbalanced.

• 0 dB=0.775 Vrms, 0 dBV=1 Vrms.

OFF

3 kΩ

ON 600Ω Lines –32 dB (19.5 mV) –20 dB (77.5 mV) +10 dB (2.45 V)

OFF

10 kΩ

ON 600Ω Lines –22 dB (61.6 mV) –10 dB (245 mV) +20 dB (7.75 V)

50~600Ω Mics –62 dB (616 µV) –50 dB (2.45 mV) –20 dB (77.5 mV)

50~600Ω Mics –52 dB (1.95 mV) –40 dB (7.75 mV) –10 dB (245 mV)

XLR-3-31 type

Phone jack
(TRS)

XLR-3-31 type

Phone jack

■ Output specifications

Output connectors

POWER AMP OUT (1•2) (A, B) 0.1Ω 4/8Ω Speaker 37.7 W/4Ω (200 W/4Ω) Phone jack

Actual source

impedance

Nominal

impedance

Nominal

Output level

Connector type

Max. before cliping

BRIDGE OUT 0.1Ω 8Ω Speaker 75.4 W/8Ω (400 W/8Ω)
MAIN OUT 600Ω 10 kΩ Lines +4 dB (1.23 V) +20 dB (7.75 V)
MONITOR OUT 600Ω 10 kΩ Lines +4 dB (1.23 V) +20 dB (7.75 V)
EFFECT OUT 600Ω 10 kΩ Lines +4 dB (1.23 V) +20 dB (7.75 V)

REC OUT (1, 2) 600Ω 10 kΩ Lines –10 dBV (316 mV) +10 dBV (3.16 V) Phono jack

• All output jacks are unbalanced.

• 0 dB=0.775 Vrms, 0 dBV=1 Vrms.

Phone jack
Phone jack
Phone jack
Phone jack

Specifications are subject to change without prior notice.

EMX640—Owner’s Manual

■ Dimensions

W: 480

470

260

Dimensions 15

D: 275

H: 275

Unit: mm

■ Block and Level diagram

PHANTOM

+48V

Lo-Z

1–4

Hi-Z

MIC

5, 6

1

LINE

2

dB

20 20

10

0

LINE

–10

HI-Z PAD:ON
Lo-Z PAD:ON

–20

–30

HI-Z PAD:OFF

–40

MIC

–50

Lo-Z PAD:OFF

PAD

HA

AUX IN

TAPE IN

1

2

FOOT SW

VOCAL

L HALL

S HALL

TAPE IN

AUX IN

HA

PAD

ADD

AUX IN

TAPE IN

ON

EQ

MID

LOW

HIGH

LOW

MIDEQHIGH

SUM

DIGITAL
EFFECT

Clipping level

DIGITAL EFFECT

LEVEL

LEVEL

EFFECT

MONI

EFFECT

MONI

EFFECT

RTN

EFFECT

RTN

MAIN

EFFECT

MONITOR

MASTER

MASTER

EFFECT

OUT

125

1

2

125

REC OUT

EQ

4k

250

REC OUT

EQ

4k

250

8k

MAIN BRIDGE

MAIN MAIN

MAIN MONITOR

INV

8k

EFFECT

OUT

EFFECT OUT

LIMITER

1

PA

LIMITER

2

PA

MAIN, MONITOR

BRIDGE
POWER AMP

MAIN

A

POWER

AMP 1

B

BRIDGE

A

POWER

AMP 2

B

MONITOR

dB
30

10

0

–10

–20

–30

–40

–50

EMX640—Owner’s Manual

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 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 coaxial 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, CA 90620

This applies only to products distributed by YAMAHA CORPORA­TION OF AMERICA.

WARNING: THIS APPARATUS MUST BE EARTHED

IMPORTANT

THE WIRES IN THIS MAINS LEAD ARE COLOURED IN
ACCORDANCE WITH THE FOLLOWING CODE:

GREEN-AND-YELLOW : EARTH
BLUE : NEUTRAL
BROWN : LIVE
As the colours of the wires in the mains lead of this apparatus may

not correspond with the coloured markings identifying the terminals in
your plug, proceed as follows:

The wire which is coloured GREEN and YELLOW must be
connected to the terminal in the plug which is marked by the letter E
or by the safety earth symbol or coloured GREEN and YELLOW.

The wire which is coloured BLUE must be connected to the terminal
which is marked with the letter N or coloured BLACK.

The wire which is coloured BROWN must be connected to the
terminal which is marked with the letter L or coloured RED.

* This applies only to products distributed by YAMAHA KEMBLE

MUSIC (U.K.) LTD.

YAMAHA CORPORATION

VY66080 R2 1 IP 16 Pro Audio Division, #18/3

P.O. Box 3, Hamamatsu, 430-8651, Japan

NP Printed in Taiwan