Yamaha MX400 User manual

MIXING CONSOLE
CONSOLES DE MIXAGE
MISCHPULTE
CONSOLA DE MEZCLA
User’s Guide
Manuel d’utilisation
Bedienungsanleitung
Manual de uso
24
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
23
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
22
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
21
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
20
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
19
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
18
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
17
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
24
ST IN 1/3
S
T
1
A
B
+4
-10
PEAK
SIGNAL
HIGH
–15 +15
LOW
–15 +15
AUX 2
1–2
3–4
ST
AUX 1
BAL/PAN
L
ODD R
EVEN
LEVEL
010
ON
PFL
S
T
3
+4
-10
PEAK
SIGNAL
HIGH
–15 +15
LOW
–15 +15
AUX 4
1–2
3–4
ST
AUX 3
BAL/PAN
L
ODD R EVEN
LEVEL
010
ON
PFL
ST IN 1/3
L
ODD R EVEN
ST IN 2/4
S
T
2
A
B
+4
-10
PEAK
SIGNAL
HIGH
–15 +15
LOW
–15 +15
AUX 2
1–2
3–4
ST
AUX 1
BAL/PAN
L
ODD R
EVEN
LEVEL
010
ON
PFL
S
T
4
+4
-10
PEAK
SIGNAL
HIGH
–15 +15
LOW
–15 +15
AUX 4
1–2
3–4
ST
AUX 3
BAL/PAN
LEVEL
010
ON
PFL
ST IN 2/4
GROUP1 GROUP2 GROUP3 GROUP4
LRST2/MONITOR
LRSTEREO 1
METER SELECT
MIXING CONSOLE
23222120191817
16
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
16
15
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
15
14
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
14
13
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
13
12
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
12
11
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
11
10
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
10
9
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
9
8
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
8
7
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
7
6
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
6
5
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
5
4
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
4
3
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
3
2
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
2
1
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
1
ON
L — ST 1 — R
∞
40
30
25
20
15
10
5
0
5
10
∞
40
30
25
20
15
10
5
0
5
10
REC OUT
010
TAPE IN
010
LEVEL
010
PHONES
010
TB
ST
AUX 1–4
GRP 1–4
TALKBACK IN
POWER
PHANTOM
PEAK
+6
+4
+2
0
–2
–4
–7
–10
–15
–20
PEAK
+6
+4
+2
0
–2
–4
–7
–10
–15
–20
PEAK
+6
+4
+2
0
–2
–4
–7
–10
–15
–20
GROUP 1
∞
40
30
15
10
5
0
5
10
20
ON
AFL
PEAK
0
–20
AUX SEND 1
∞
40
30
25
20
15
10
5
0
5
10
PAN
LR
ON
AFL
TO ST
GROUP 2
∞
40
30
25
20
15
10
5
0
5
10
PAN
LR
ON
AFL
TO ST
∞
40
30
15
10
5
0
5
10
20
ON
AFL
PEAK
0
–20
AUX SEND 2
GROUP 3
∞
40
30
25
20
15
10
5
0
5
10
PAN
LR
ON
AFL
TO ST
∞
40
30
15
10
5
0
5
10
20
ON
AFL
PEAK
0
–20
AUX SEND 3
GROUP 4
LR
∞
40
30
25
20
15
10
5
0
5
10
PAN
ON
AFL
TO ST
∞
40
30
15
10
5
0
5
10
20
ON
AFL
PEAK
0
–20
AUX SEND 4
ST2/MONITOR
∞
40
30
25
20
15
10
5
0
5
10
PFL
ON
L+R
2TR IN
MONI
ST2
∞
40
30
15
10
5
0
5
10
20
ON
AFL
PEAK
0
–20
AUX SEND 5

IMPORTANT NOTICE FOR
THE UNITED KINGDOM
Connecting the Plug and Cord
IMPORTANT: The wires in this mains lead are coloured in accordance
with the following code:
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 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.
Making sure that neither core is connected to the earth terminal of the
three pin plug.
* This applies only to products distributed by YAMAHA - KEMBLE
MUSIC (U.K.) LTD. 5-2 BS2 01 2/5

Contents
i
MX400 User’s Guide
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . 1
Features of the MX400 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2 Front and rear panels . . . . . . . . . . . . 2
Input modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Stereo module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
AUX SEND module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
GROUP module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ST2/MONITOR module . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Master module (L-ST1-R) . . . . . . . . . . . . . . . . . . . . . . . . . 9
Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Rear panel . . . . . . . . . . . . . . . . . . . . 11
4 Appendix . . . . . . . . . . . . . . . . . . . . . 14
General specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Input Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Output Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
IMPORTANT NOTICE FOR
THE UNITED KINGDOM
Connecting the Plug and Cord
IMPORTANT: The wires in this mains lead are coloured in accordance
with the following code:
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 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.
Making sure that neither core is connected to the earth terminal of the
three pin plug.
* This applies only to products distributed by YAMAHA - KEMBLE
MUSIC (U.K.) LTD. 5-2 BS2 01 2/5

ii
Precautions
MX400 User’s Guide
Precautions
1. Location
Keep the unit away from locations where it is likely to be exposed to high tem-
peraturesorhumidity—suchasnearradiators,stoves,etc.Alsoavoidlocations
which are subject to excessive dust accumulation or vibration which could
cause mechanical damage and locations subject to strong electromagnetic
fields,such as close to broadcast equipment.
2. Ventilation
The unit has ventilation slots on the bottom panel. Do not block these vents.
3. Avoid 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
Thisproductcontainsnouser-serviceableparts.Referallmaintenancetoqual-
ifiedYamaha service personnel.Opening the case and/or tampering with the
internal circuitry voids the warranty.
5. Always power off before making connections
Always turnthepowerOFFbeforeconnecting ordisconnectingcables.This is
importanttopreventdamagetotheunititselfaswellasotherconnectedequip-
ment.
6. Handle Cables Carefully
Alwaysplugandunplugcables—includingtheACpowercord—bygripping
the connector, not the cord.
7. Clean With a Soft Dry Cloth
Neverusesolventssuchasbenzineorthinnertocleantheunit.Wipecleanwith
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 localAC mains supply.Also make sure that the AC mains supply can
delivermorethanenoughcurrenttohandleallequipmentusedinyoursystem.

Introduction
1
MX400 User’s Guide
Introduction
Thank you for purchasing theYamaha MX400.The MX400 series is designed
foreasyoperation andversatility inawiderange of applications,includingPA
and installed systems.The MX400 series includes three models; 8 channel,12
channel,16 channel,and 24 channel mixers.
In order to take full advantage of the MX400’s functionality, please read this
manual carefully.
Features of the MX400
Each of the mono input channels provides the following functions.
• XLR/phone input jacks
• 20dB pad switch / continuously variable gain control
• 3bandEQ(withvariablemid-rangefrequency)/EQon/offswitch/high
pass filter switch
• TRS insert jack / direct output
• Atotalof 5AUXSENDsystems (pre
×
2,post/pre
×
2 (switchable),post
×
1)
• ODD/EVEN group and stereo assign switch / pan control
• Channel ON switch
• PFL switch
• Level meter for accurate level control
Inadditiontothemonoinputchannels,4setsofstereoinputchannelsarepro-
vided, with the following functions.
• Four stereo inputs with 2 band EQ
• GROUP/AUX/STEREO assign switches
• Balance/pan control
• TRS 1/4”phone jack and RCA input jack select switch (only for stereo
input 1/2)
The master section provides the following features.
• Five fader-style AUX SEND controls
• Independent 3 point level meter for each AUX SEND control
• TO ST switch and pan control for each GROUP
• GROUP ON switch,AFL switch,and 100 mm fader for each GROUP
• The MONI/ST2 switch allows the ST2/MONI OUT output signal to be
switched in the following two ways;
1) Oneofthesignalsfromanexternalsourceinputtothestereobus,the
PFL bus,or the 2TR IN.
2) The same signal as the ST1 OUT output signal.
• ONswitch,L+Rswitch,andfaderareprovidedfortheST2/MONIOUT
output signal.
In addition,the following functions are provided.
• XLR mic inputs
• Talkback level control
• Assign switch
The TAPE IN jacks and REC OUT jacks have level controls,for convenience
when you need additional margin for monitoring or recording. The level
meters with peak indicators allow accurate monitoring.

2
Front and rear panels
MX400 User’s Guide
Front and rear panels
Input modules
1
A/B switch
This switch selects the signal source of the input module.
Select INPUT A (XLR type) or INPUT B (1/4”phone type).
2
20dB pad switch
This is a 20dB input pad (attenuator) that affects INPUT A and INPUT B.
If thelevelof the inputsignal istoohighfor adjustmentstobe madeusing
theGAINcontrolalone,usethepadtoattenuatethesignaltoanappropriate
level.The pad is on when this switch is pressed in.
3
GAIN control
This controls the gain of the preamp for INPUT A and INPUT B. Gain is
variable to a maximum of 44dB.
TheGAINcontrolisalwaysusedinconjunctionwiththeSIGNALindicator
andthePEAKindicator.Adjustthe GAIN controlsothattheSIGNALindi-
cator is always lit when an input signal is present,and the PEAK indicator
lights occasionally.If thePEAKindicatorlightsfrequently,lowertheGAIN
control to prevent the signal from distorting.The following table shows
usual settings for the GAIN control.
4
SIGNAL indicator and PEAK indicator
When thepost EQ signal level(nominallevel0dB) reaches–10dB,the SIG-
NALindicatorwilllight.Thisindicatorindicatesthatasignalisbeinginput.
When the post EQ signal level reaches 3dB before clipping level,the PEAK
indicatorwilllight.This indicatorindicates that the signal has approached
clippinglevel.Set thesignal levelbasedon thestatusof the PEAKindicator.
For the procedure,see the explanation for
3
GAIN control.
Signal source GAIN control position 20dB pad switch
Dynamic mic (low level) –60 ~ –50 off
Condenser mic (high level) –35 off
Audio device, electronic musical in-
strument (low level) –20 off
Audio device, electronic musical in-
strument (high level) +4 on
A
B
20dB
GAIN
–16 –60
HIGH
–15 +15
MID FREQ
250 5K
MID
–15 +15
LOW
–15 +15
AUX 1
010
AUX 2
010
AUX 3
010
AUX 4
010
AUX 5
010
P
O
S
T
P
R
E
PRE
EQ
80
PEAK
SIGNAL
1
2
3
5
6
4
7
8
–16 –60
GAIN
–16 –60
GAIN
–16 –60
GAIN
–16 –60
GAIN

Input modules
3
MX400 User’s Guide
5
high pass filter switch
This switch cuts the input signal below 80 Hz at 12dB/octave.The filter is
turned on when the switch is pressed in.
By using the high pass filter,you can reduce or eliminate wind noise, mic
pop noise,and power supply hum etc.
6
EQ controls (HIGH, MID FREQ, MID, LOW)
Thisisa3-bandequalizerwithcenterfrequencies,range,andtypeasshown
below.
HIGH: 12 kHz +/–15dB shelving type
MID: 250 Hz ~ 5 kHz (variable) +/–15dB peaking type
LOW: 80 Hz +/–15dB shelving type
The frequency response is flat when the knob is in the center position.
EQ switch
ThisswitchturnstheEQon/off.WhentheswitchispressedintheEQison.
In addition to bypassing the EQ when it is not being used,this switch pro-
vides a convenient way to compare the equalized and unequalized signals.
7
AUX 1 / AUX 2 controls
These adjust the signal level that is sent to each outputAUX SEND 1 and
AUX SEND 2.These signals are pre-fader (i.e.,they are taken from before
the fader adjustment).Nominal level is at 3 o’clock position.
8
AUX 3 / AUX 4 / AUX 5 controls
These adjust the signal level that is sent to each outputAUX SEND 3,AUX
SEND 4 and AUX SEND 5.
The signals controlled by AUX 3 andAUX 4 will depend on the setting of
the PRE switch.
• When the PRE switch is not pressed
They control the post-fader signal.
• When the PRE switch is pressed
They control the pre-fader signal.
AUX 5 controls the post-fader signal.
Nominal level is at 3 o’clock position.
80
10k 20k1k10020
–20
–10
0
10
20
Frequency (Hz)
Signal Level (dB)
50 5k2k500200 50k
MID FREQ
250 5k

4
Front and rear panels
MX400 User’s Guide
9
Assign switches (1-2, 3-4, ST)
These switches assign the signal of the input module to the group outputs
and the ST output.The PAN control located below adjusts the stereo posi-
tion of the signal between the odd (ODD) group and left (L) outputs and
the even (EVEN) group and right (R) outputs.
0
PAN control
Thisknobadjusts thestereoposition of thesignalbetween thestereoL and
R,and between theodd/evengroups.Forexampleif this knobisturned all
thewaytotheleft,thesignalwillbesentonlytotheLandodd(ODD)groups
whoseassign switchesarepressed.If itis turnedall thewaytothe right,the
signal willbe sentonlyto the Rand even(EVEN)groups.If theknob isset
to the center position, the same amount of signal will be sent to the stereo
L and R,and the odd/even groups.
A
ON switch
This switch turns the input module on/off.When the switch is pressed in
the input module is on.Be sure to turn off input modules that are not in
use.Evenwhenamoduleisoff,theSIGNALandPEAKindicatorswilllight
if asignalis beinginput.Youcanalso usethe PFLswitchto monitor thesig-
nal even if a module is off.
B
PFL switch
PFLis an acronymfor Pre-FaderListen.This switchallowsyouto monitor
thesignal of the inputmodule regardless of thefader position,the settings
of the ON switch,the group assign switches,or the AUX settings.As the
namesuggests,thesignal is takenpre-fader(postEQ).Youmaylistentoan
individual module,or to two or more modules simultaneously. The PFL
indicator located at the top of the STEREO module will light when a PFL
switch is on.
C
Fader
This adjusts the signal level that is sent to the various outputs.Faders are
usedindividuallyorinconjunctionwith thefaders of theother inputmod-
ulestocreatethe desired mixbalance.A position at the zero(0) marking is
the nominal level.Raising the fader above 0 provides up to 10dB of gain.
PAN
L
ODD R
EVEN
∞
40
30
25
20
15
10
5
0
5
10
ON
PFL
ST
3–4
1–2
9
0
A
B
C

Stereo module
5
MX400 User’s Guide
Stereo module
1
A/B switch
This switch selects the signal source for the stereo module.
Select either ST INPUT A (unbalanced 1/4”phone type) or ST INPUT B
(RCA pin) input. This switch is not provided for [ST3] or [ST4].
2
Sensitivity select (+4/–10) switch
This switch selects the gain appropriate for the input signal level.The sen-
sitivity is –10dB when the switch is pressed in, and +4dB when the switch
is not pressed in.
3
SIGNAL and PEAK indicators
When thepost EQ signal level(nominallevel0dB) reaches–20dB,the SIG-
NALindicatorwilllight.Thisindicatorindicatesthatasignalisbeinginput.
When the post EQ signal level reaches 3dB before clipping level,the PEAK
indicatorwilllight.This indicatorindicates that the signal has approached
clippinglevel.Set thesignal levelbasedon thestatusof the PEAKindicator.
4
EQ controls (HIGH, LOW)
Thisisa2-bandequalizerwithcenterfrequencies,range,andtypeasshown
below.
HIGH: 12 kHz +/–15dB shelving type
LOW: 80 Hz +/–15dB shelving type
The frequency response is flat when the knob is in the center position.
5
AUX 1 / AUX 2 / AUX 3 / AUX 4 switches
These switches send the mono signal to the AUX buses. They are on when
pressed in.
[ST1] and [ST2] select the AUX 1 and AUX 2 buses.
[ST3] and [ST4] select the AUX 3 and AUX 4 buses.
6
Assign switches (1-2, 3-4, ST)
These switches assign the signal of the stereo module to the group outputs
and the ST output.The PAN control located below adjusts the stereo posi-
tion of the signal between the odd (ODD) group and left (L) outputs and
the even (EVEN) group and right (R) outputs.
7 BAL/PAN control
The BAL/PAN knob adjusts the balance or the L/R position of the stereo
modulesignal.Forexample if thisknob isturnedallthe way to theleft,the
signal will be sent only to the L and odd (ODD) groups whose assign
switchesarepressed.If itisturned allthe waytotheright,thesignal willbe
sent only to the R and even (EVEN) groups.If the knob is set to the center
position,the same amount of signal will be sent to the stereo L and R,and
the odd/even groups.
8
LEVEL control
This adjusts the output level of the stereo module.
S
T
1
A
B
+4
-10
PEAK
SIGNAL
HIGH
–15 +15
LOW
–15 +15
AUX 2
1–2
3–4
ST
AUX 1
BAL/PAN
L
ODD R
EVEN
LEVEL
010
ON
PFL
S
T
3
+4
-10
PEAK
SIGNAL
AUX 4
AUX 3
1
2
7
8
9
0
2
4
3
3
6
5
5

6
Front and rear panels
MX400 User’s Guide
9
ON switch
Thisswitchturns the stereomodule on/off.Whentheswitchispressed the
stereo module is on.Be sure to turn off input modules that are not in use.
Evenwhen amoduleis off,the SIGNAL and PEAKindicatorswilllightif a
signal isbeing input.Youcan also use the PFL switchtomonitor the signal
even if a module is off.
0
PFL switch
PFLis an acronymfor Pre-FaderListen.This switchallowsyouto monitor
thesignal of thestereomoduleregardlessof thefaderposition,the settings
of the ON switch,the group assign switches,or the AUX settings.As the
namesuggests,thesignal is takenpre-fader(postEQ).Youmaylistentoan
individual module,or to two or more modules simultaneously.