MIXING CONSOLE
Owner's Manual
OFF
PHANTOM +48V
INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT
MIC
ON
MIC
MIC
MIC
MIC
MIC
MIC MIC
LINE LINELINE LINE LINE LINE LINE LINE
INS
INS
INS
I ⁄ O
I ⁄ O
12345678
GAIN
GAIN
+10
+10
-34
-16
-16
-60
PEAK
PEAK
HIGH
HIGH
+15
-15
-15
MID
MID
+15
-15
-15
LOW
LOW
+15
-15
-15
MONI 1
MONI 1
10
0
0
EFFECT
EFFECT
10
0
0
2
1
1
3
3
4
PAN
PAN
2413
10
10
5
5
0
0
5
5
10
10
15
15
20
20
30
30
40
40
00
00
1
INS
I ⁄ O
I ⁄ O
INSERT I/O
OUT IN
GAIN
GAIN
GAIN
GAIN
GAIN
+10
+10
+10
-34
-34
-34
-16
-60
PEAK
HIGH
+15
-15
MID
+15
-15
LOW
+15
-15
MONI 1
10
0
EFFECT
10
0
2
1
3
4
PAN
2413
10
5
0
5
10
15
20
30
40
00
2
-16
-16
-60
-60
PEAK
PEAK
HIGH
HIGH
+15
+15
-15
-15
MID
MID
+15
+15
-15
-15
LOW
LOW
+15
+15
-15
-15
MONI 1
MONI 1
10
10
0
0
EFFECT
EFFECT
10
10
0
0
2
2
1
1
3
3
4
4
PAN
PAN
2413
2413
10
10
5
5
0
0
5
5
10
10
15
15
20
20
30
30
40
40
00
00
4
3
+10
+10
-34
-34
-34
-16
-16
-60
-60
-60
PEAK
PEAK
HIGH
HIGH
+15
MID
+15
LOW
+15
MONI 1
10
EFFECT
10
2
4
PAN
2413
10
5
0
5
10
15
20
30
40
00
5
+15
+15
-15
-15
MID
+15
+15
-15
-15
LOW
+15
+15
-15
-15
MONI 1
10
10
0
0
EFFECT
10
10
0
0
2
2
1
1
3
3
4
4
PAN
2413
2413
10
5
0
5
10
15
20
30
40
00
7
6
GAIN
HIGH
MID
LOW
MONI 1
EFFECT
PAN
MONI
1
EFFECT MONI
L
(MONO)
R
+10
PEAK
-15
-15
-15
0
0
1
3
10
5
0
5
10
15
20
30
40
00
11
ST OUTPUT
2
L
R
1
3
C-R OUT
2
4
PHONES
GROUP
OUTPUTINPUT INPUT
-34
LR
TAPE IN
+15
TAPE IN
+15
ST
010
+15
DIGITAL
EFFECT
10
125
10
+12
2
6
0
4
6
-12
2413
10
5
0
5
10
15
20
30
40
00
GROUP
1
12
L
REC OUT
MONI
010
ST
010
L HALL S HALL
VOCAL
500
250
ST GRAPHIC EQUALIZER
10
5
0
5
10
15
20
30
40
00
GROUP
2
R
ST
1k
10
5
0
5
10
15
20
30
40
00
GROUP
PHANTOM POWER
RTN
010
010
ON
2k
3
SEND
MONI 1MONI
010
EFFECT ⁄ MONI 2
010
EFFECT
MONI2
8k4k
10
5
0
5
10
15
20
30
40
00
GROUP
MIXING CONSOLE
010
C-R•PHONES
METER
C-R•PHONES
TAPE IN
ST
EFFECT
⁄ MONI
EFFECT
MONI 1
/ MONI 2
L
R
PEAK
+5
+3
+1
0
-1
-3
-5
+12
-7
6
-10
0
-15
6
-20
-12
ST
4
3
GROUP
10
5
0
5
10
15
20
30
40
00
4
ST
RTN SEND
(MONO)
L
R
(MONO)
L
91011
R
12
GAIN
GAIN
+10
-34
-34
+10
-16
-60
PEAK
PEAK
-15
-15
-15
0
0
1
3
10
5
0
5
10
15
20
30
40
00
HIGH
HIGH
+15
+15
-15
MID
MID
+15
+15
-15
LOW
LOW
+15
+15
-15
MONI 1
MONI 1
10
10
0
EFFECT
EFFECT
10
10
0
2
1
2
3
4
4
BAL
BAL
2413
2413
10
5
0
5
10
15
20
30
40
00
9
8
10
E
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
The unit has ventilation slots on the rear and bottom
panels. 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 Y ourself
This product contains no user-serviceable parts. Refer
all 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.
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.
IMPORTANT NOTICE FOR
THE UNITED KINGDOM
Connecting the Plug and Cord
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.
MX12/4—Owner’s Manual
Thank you for purchasing the Yamaha MX12/4 mixing console. The
MX12/4 is a 12 in/4 group out mixer that provides an ideal balance of
operability, functionality, and simplicity.
In order to take full advantage of the MX12/4's functionality and to enjoy
long and trouble-free use, please read this owner’s manual before use, and
keep it for future reference.
MX12/4
1
Features
• The MX12/4 provides 12 input channels, and
mixes them to stereo or to four group outputs.
• A C-R OUT jack is provided for convenient connection to a sub amp for monitoring. You can
monitor the main stereo output, the TAPE IN
input, and the effect/monitor signals.
• A digital effect unit is built-in, allowing you to create a polished mix without the need for additional
equipment.
• Two SEND jacks are provided: the MONO 1 jack
(pre fader) and the EFFECT/MONO 2 jack (post/
pre fader). These can be used as sends for external
effects or a monitor system.
• Phantom power is provided, so that condenser
microphones requiring an external power supply
can be easily connected.
• INS I/O jacks are provided for input channels 1-4,
allowing individual effects to be inserted into each
channel.
• Input channels 1-8 provide both XLR type mic
inputs and TRS phone line inputs. Channels 9-12
provide stereo line inputs. The MX12/4 accommodates a wide range of sources, from microphones to
line level devices and stereo output synthesizers.
• TAPE IN jacks and REC OUT jacks make it easy to
connect tape decks for playback and recording.
Contents
Front panel.................................................2
Channel control section ..............................2
Master control section.................................4
Connector section....................................... 6
Rear panel..................................................8
Application Example...................................9
Specifications...........................................10
General specifications............................... 10
Input specifications ...................................11
Output specifications................................. 11
Dimensions ............................................... 12
Block and Level diagram........................... 13
MX12/4—Owner’s Manual
Front panel
2
Front panel
Channel control section
Channels 1~8
(monaural)
GAIN
+10
HIGH
-15
MID
-15
LOW
-15
MONI
EFFECT
PAN
10
5
0
5
-16
PEAK
0
0
1
3
-34
-60
+15
+15
+15
10
10
2
4
2413
Channels 9~12
1
2
3
4
5
6
7
(stereo)
GAIN
+10
PEAK
HIGH
-15
MID
-15
LOW
-15
MONI
0
EFFECT
0
1
3
BAL
10
5
0
5
GAIN control
1
Use this knob to adjust the sensitivity according to the input signal level, so that the input level is appropriate.
For the best balance of S/N ratio and dynamic range, adjust this
knob so that the peak indicator 2 lights occasionally.
-34
–60
–16
~ indicates the MIC input adjustment level, and –34~
+10 indicates the LINE input adjustment level.
2
+15
PEAK indicator
This detects the peak level post EQ.
The indicator will light red 3dB before clipping, warning that
+15
+15
clipping level is near.
Equalizer
3
This provides
±
15dB of control over the high, mid and low
ranges at the following center frequencies.
HIGH : 12kHz (shelving)
10
MID : 2.5kHz (peaking)
LOW : 80Hz (shelving)
10
2
4
2413
The frequency response will be flat when the knob is in the “▼”
position.
+20
+15
+10
+5
0
–5
Response [dB]
–10
–15
–20
Frequency [Hz]
10k1k100 20k20
10
15
20
30
40
00
1
MX12/4—Owner’s Manual
8
10
4
15
20
30
40
00
MONI (monitor) control
This knob controls the level of the signal that is sent from each
channel to the MONI bus.
Since this control is placed before the channel fader, it controls
the level independently from the channel fader setting.
EFFECT control
9
10
5
This knob controls the level of the signal that is sent from each
channel to the EFFECT bus.
Since this control is placed after the channel fader, the signal
level will be affected by the channel fader setting.
Channel control section
Group select switches
6
These switches send the signal of each channel to GROUP buses 1~4.
When the / switches are on (pressed in), the signal will be sent to the GROUP buses 1/2.
When the / switches are on (pressed in), the signal will be sent to the GROUP buses 3/4.
1 2
3 4
When both switches are on, the signal will be sent to GROUP buses 1/2 and 3/4.
7
PAN (panpot) control
BAL (balance) control
The PAN knobs (channels 1~8) set the stereo position of the signal that is sent to the GROUP
buses 1/2 or 3/4.
The BAL knobs (channels 9~12) set the balance between the left/right channels, and assign
the signals received at inputs 9 L (MONO) and 11 L (MONO) to the GROUP buses 1/3, and
the signals received at inputs 10 R and 12 R to the GROUP buses 2/4.
If signals are input monaurally to input 9 L (MONO) or 11 L (MONO), the same signal will
be sent to groups 1~4.
Channel fader
8
This controls the output level of the input channel signal, adjusting the volume balance
between channels. The faders of unused channels should be lowered.
3
INPUT
1-4
INPUT
5-8
INPUT
9/10
11/12
MIC
LINE
MIC
LINE
L(MONO)
R
PHANTOM
PHANTOM
MASTER
PAD
PAD
INS
I/O
HA
GAIN
HA
GAIN
HA EQ
GAIN
LOW
LOW
LOW
MID
EQ
EQ
EQHA
MID
MID
HIGH
HIGH
HIGH
PEAK
PEAK
PEAK
PAN
EFFECT
MONI
PAN
EFFECT
MONI
BAL
GROUP
4321
EFFECT
MONI
EFFECT
MONI
MX12/4—Owner’s Manual
4
0
9
4
Front panel
Master control section
5
LR
TAPE IN
TAPE IN
ST
010
DIGITAL
EFFECT
125
+12
6
0
6
-12
10
5
0
5
10
15
20
30
40
00
GROUP 1
6
L
REC OUT
MONI
010
ST
010
L HALL S HALL
VOCAL
500
250
ST GRAPHIC EQUALIZER
10
5
0
5
10
15
20
30
40
00
GROUP 2
78
AB
PHANTOM POWER
R
1k
GROUP 3
RTN
010
ST
010
ON
2k
10
5
0
5
10
15
20
30
40
00
SEND
MONI 1MONI
010
EFFECT ⁄ MONI 2
010
EFFECT
MONI2
10
5
0
5
10
15
20
30
40
00
GROUP 4
C-R•PHONES
METER
C-R•PHONES
MONI 1
8k4k
+12
6
0
6
-12
10
5
0
5
10
15
20
30
40
00
010
TAPE IN
ST
EFFECT
⁄ MONI
EFFECT
/ MONI 2
L
R
PEAK
+5
+3
+1
0
-1
-3
-5
-7
-10
-15
-20
ST
4
3
GROUP
ST
1
ST OUT output select switch
This switch selects the signal which is output via the ST
fader from the ST OUTPUT jacks.
ST position ( )
The ST OUTPUT jacks will output the ST bus signal
(the post-fader signals of groups 1~4, the input signals
from the RTN jacks, the return signal from the internal
digital effect, and the input signal from the TAPE IN
jacks).
GROUP position ( )
3 4
The ST OUTPUT jacks will output the pre-fader signals of groups 3/4.
When this position is selected, the input channel sig-
C
nals will be sent directly to the ST bus without passing
through the group buses 1~4. This setting lets you use
the MX12/4 as a simple 12 in-2 out mixer.
1
2
ST master fader
This fader adjusts the final combined level of all channels, and sends the signal to the ST OUTPUT jacks.
The meters allow you to view the L and R output levels.
3
GROUP 1~4 faders
These faders adjust the signal levels of groups 1~4, and
send their signals to GROUP OUTPUT 1~4 jacks
2
respectively and to the ST bus.
Groups 1 and 3 are sent to ST L, and groups 2 and 4 are
sent to ST R.
Stereo graphic EQ
4
This is a stereo 7-band graphic equalizer that adjust the
3
tonal quality of the signal output to the ST OUTPUT
jacks.
A
±
12dB boost or cut is provided at each of the fre-
quency bands 125, 250, 500, 1k, 2k, 4k, and 8kHz.
TAPE IN jacks
5
These are line level input jacks to which an external DAT recorder or CD player etc. can be
connected for monitoring. The signals which are input here are sent to the ST bus. The input
levels are adjusted by the TAPE IN ST control ( 9 ). Depending on the setting of the C-R•
PHONES select switch ( D ), the signal can also be monitored directly from the C-R OUT jack.
REC OUT jacks
6
These jacks allow an external DAT recorder or cassette recorder to be connected, to record the
same signal as the ST OUTPUT jacks.
The signals that are output from these jacks are not affected by the settings of the ST master
fader or the graphic EQ. Make recording level adjustments on the recording device.
PHANTOM indicator
7
This indicator will light when the PHANTOM switch (rear panel 2 ) is on.
8
POWER indicator
This indicator will light when the MX12/4's power is on.
MX12/4—Owner’s Manual
Master control section
ST control
9
This knob adjusts the monitor level of the external device (tape deck etc.) connected to the
TAPE IN jacks ( 5 ).
0
DIGITAL EFFECT
MONI control
nal digital effect to the MONI bus.
ST control
digital effect to the ST bus.
Effect select switches
VOCAL, L HALL (large hall), or S HALL (small hall).
Do not attempt to turn off all switches or to simultaneously press two or more switches, since
this will cause malfunctions.
ON switch
be sent from the internal digital effect.
RTN
A
MONI control
MONI bus.
ST control
bus. If a signal is input only to the RTN L (MONO) jack, the same signal will be sent to the ST
bus L and R.
—This knob adjusts the level of the return signal which is sent from the inter-
—This knob adjusts the level of the return signal which is sent from the internal
—These switches select the effect type for the internal digital effect:
—This switch turns the internal digital effect on/off. When this is off, no signal will
—This knob adjusts the level of the signal that is sent from the RTN jacks to the
—This knob adjusts the level of the signal that is sent from the RTN jacks to the ST
5
SEND
B
MONI 1 control
SEND MONI 1 jack.
EFFECT/MONI 2 control
nal that is output to the SEND EFFECT/MONI 2 jack.
The level of the signal that is sent from the EFFECT bus to the internal digital effect is fixed,
and cannot be adjusted (nor by this control).
Output select switch
MONI 2 jack.
EFFECT position
MONI 2 position
C
C-R•PHONES
Here you can select and adjust the signal that is output to the C-R OUT jack and the PHONES
jack.
C-R•PHONES control
PHONES jack.
Output select switch
PHONES jack.
Meter
—The LEDs indicate the output level before the C-R•PHONES control. A position of 0
indicates nominal level, and when clipping level is approached, PEAK will light red as a warning.
—This knob adjusts the level of the MONI bus signal that is output to the
—This knob adjusts the level of the EFFECT bus or MONI bus sig-
—This switch selects the signal that will be output to the SEND EFFECT/
()
—The EFFECT bus signal will be output.
—The MONI bus signal will be output.
()
— This knob adjusts the output level to the C-R OUT jack and
—These switches select the output signal for the C-R OUT jack and
•
When the upper switch is on (TAPE IN ), the signal from the TAPE IN
jacks will be output.
•
When the upper switch is off ( )
• When the lower switch is off (ST ), the same signal as the ST OUTPUT jacks will be output.
• When the lower switch is on (EFFECT/MONI ), the signal of the
SEND MONI 1 jack will be sent to the L channel, and the SEND
EFFECT/MONI 2 signal will be sent to the R channel.
MX12/4—Owner’s Manual
6
Front panel
Connector section
2135
MIC
INS
I ⁄ O
INPUT
OFF
ON
MIC
INS
I ⁄ O
MIC
INS
I ⁄ O
MIC
INSERT I/O
OUT IN
MIC
MIC MIC
PHANTOM +48V
INPUT INPUT INPUT INPUT INPUT INPUT INPUT INPUT
MIC
LINE LINELINE LINE LINE LINE LINE LINE
INS
I ⁄ O
12345678
1
MIC (1~8) —These are balanced XLR type mic input jacks (1: ground, 2: hot, 3: cold).
These inputs are compatible with 50~600
Ω
microphones.
LINE (1~8) —These are balanced TRS phone type line input jacks (T: hot, R: cold, S:
ground).
These inputs are compatible with 600 ohm line level devices.
It is also possible to connect unbalanced phone plugs, but noise may enter the signal if the
cables are long or if the location is susceptible to electromagnetic interference.
RTN SEND
L
(MONO)
R
L
(MONO)
9
R
10
2
L
1
2
GROUP
OUTPUTINPUT INPUT
ST OUTPUT
R
3
C-R OUT
4
PHONES
MONI
1
EFFECT MONI
L(MONO)
11
R
12
4687
Note:
It is not possible to connect both the MIC INPUT jack and the LINE INPUT jack for
an individual input channel. Only one or the other jack may be used.
INS I/O 1~4 —These are input/output jacks placed between the equalizer and fader of input
channels 1~4.
The nominal input level/impedance is 0dB/600
Ω
, and the nominal output level/impedance is
0dB/10kΩ.
Devices such as graphic equalizers, compressors or noise filters can be connected here.
The INS I/O jacks provide bi-directional connections using TRS (tip, ring, sleeve) phone
jacks. These connections require a special insertion cable such as shown in the following diagram.
to the input jack of
the external processor
to the INS I/O jack
Sleeve
Sleeve
Ring
Tip
Tip
to the output jack of
the external processor
MX12/4—Owner’s Manual
Connector section 7
2 RTN L (MONO), R
These are unbalanced phone type line input jacks, with a nominal input level and impedance
of +4dB/600Ω.
The signals which are input from these jacks are sent to the ST bus and the MONI bus.
Normally, these jacks are used to receive the return signal from an external effect device such
as reverb or delay, but they can also be used as auxiliary stereo inputs. If only the L (MONO)
jack is connected, the same signal will be sent both to the R jack and L jack, for monaural
input.
3 SEND MONI 1, EFFECT/MONI 2
These are unbalanced phone type output jacks. The nominal input level and impedance are
+4dB/600Ω.
The MONI 1 jack outputs the MONI bus signal, and the EFFECT/MONI 2 jack outputs the
signal of the EFFECT bus or MONI bus. These are used to send signals to an external effect
unit or to a monitor system such as a cue box.
4 INPUT 9~12
These are unbalanced phone type stereo line input jacks, compatible with 600Ω line level
devices.
If only the L (MONO) jack is connected, the same signal will be sent both to the L and R jacks,
for monaural input. In this case, the group select switch (channel control section 6) will send
the same signal to the group buses 1/2 or 3/4.
5 ST OUTPUT (L, R)
These are balanced XLR type output jacks with a nominal output/impedance of +4dB/600Ω.
They provide stereo output of the mixed signal, and are normally connected to a power amp
etc. which drives the main speakers.
These outputs can also be used in order to record the signal at a level adjusted by the ST fader.
6 GROUP OUTPUT 1~4
These are unbalanced phone type output jacks which output the signals of group buses 1~4,
with a nominal output/impedance of +4dB/600Ω. Normally these are connected to the input
jacks of an MTR or an external mixer.
7 C-R OUT
This is a stereo phone type output jack for connection to a monitor system etc., with a nomi-
nal output/impedance of +4dB/10kΩ.
The source monitored by this jack is selected by the C-R•PHONES output select switch (master control section C).
Note: An insertion cable can also be used when connecting this jack to a stereo monitor system.
8 PHONES
This is a stereo phone type output jack for connecting a set of headphones.
The source monitored by the headphones is selected by the C-R•PHONES output select
switch (master control section C).
MX12/4—Owner’s Manual
8 Rear panel
2
1
3
1
2
3
Sleeve
Ring
Tip
Sleeve
Tip
Connector polarity
MIC INPUT
ST OUTPUT
LINE Input
INS I/O
C-R OUT
Stereo Input
RTN
GROUP OUTPUT
SEND MONI1
SEND EFFECT/MONI2
Rear panel
Pin 1: ground
Pin 2: hot (+)
Pin 3: cold (–)
Tip: hot (+)
Ring: cold (–)
Sleeve: ground
Tip: Output
Ring: Input
Sleeve: ground
Tip: L
Ring: R
Sleeve: ground
Tip: hot
Sleeve: ground
POWER
ON ⁄ OFF
PHANTOM MASTER
CH1 ~ 8
ON OFF
(+48V)
21
Phantom Power Warning
To prevent hazard or damage, connect
only microphones and cables that
conform to the IEC268-15A standard.
1 POWER switch
When this is on, power is applied to the unit.
When turning off the power, the rule for audio equipment is to turn off devices in the order of
their closeness to the speakers (normally beginning with the power amp).
2 PHANTOM switch
This switch turns the phantom power on/off for all channels 1~8.
Use this when you are using condenser microphones.
When this switch is on, +48V DC will be supplied to pins 2 and 3 of all XLR type MIC INPUT
connectors.
If you do not require phantom power, be sure to set this in the OFF position.
MX12/4—Owner’s Manual
Note: Although it will not cause problems to connect balanced dynamic microphones or line
level devices with this switch turned on, connecting unbalanced devices or devices for which
the center of the transformer is ungrounded may cause hum or malfunction.
Application Example
Monitors speakers
Application Example 9
Main speakers
Headphone
MTR
PHONES
GROUP
OUTPUT
Power amp
C-R OUT
Effects processor
88
INS I/O
Power amp
ST OUT
MIXING CONSOLE
TAPE IN
REC OUT
SEND
RTN
Cassette deck
or DAT
Effects processor
88
INPUT
Mic and line input
MX12/4—Owner’s Manual
10 Specifications
Specifications
■ General specifications
20Hz~20kHz+1dB, –2dB @+4dB
Frequency response
Total harmonic distortion
Hum and noise
(Rs=150Ω, 20Hz~20kHz)
Maximum voltage gain
Crosstalk at 1kHz
Gain control 44dB variable
Input channel equalization
Meters 12 points LED
Input Gain control at minimum level
(ST OUT, GROUP OUT, MONITOR OUT, EFFECT OUT@600Ω)
<0.1%@+14dB 20Hz~20kHz
(ST OUT, GROUP OUT, MONITOR OUT, EFFECT OUT@600Ω)
–128dB equivalent input noise
–95dB residual output noise
(ST OUT, GROUP OUT, MONITOR OUT, EFFECT OUT@600Ω)
–87dB (ST OUT/GROUP OUT)
–64dB (68dB S/N)
(ST OUT/GROUP OUT)
–80dB (MONITOR1 OUT, EFFECT/
MONITOR2 OUT)
–64dB (68dB S/N)
(MONITOR1 OUT, EFFECT/MONITOR2
OUT)
84dB MIC IN to GROUP OUT
58dB LINE IN to GROUP OUT
90dB MIC IN to EFFECT/MONITOR2 OUT
80dB MIC IN to MONITOR1 OUT
70dB adjacent input
70dB input to output
±15dB Maximum
HIGH 12kHz shelving
MID LOW 2.5kHz peaking
LOW 80Hz shelving
* Turn over/Roll off frequency of shelving: 3dB below maximum variable level
ST master/GROUP fader at nominal level and all
channel fader at minimum.
ST master/GROUP fader at nominal level
One channel fader, Gain control: maximum.
Fader: nominal
Master level control at nominal level and all channel
level controls at minimum.
Master fader at nominal level
One channel fader, Gain control: maximum.
Fader: nominal
Control level: nominal
Channel peak indicators An indicator for each channel turns on when the pre-channel fader signal is 3dB below clipping.
Graphic equalizer
Internal digital effect 3 types
Phantom power +48V (balanced)
Option Rack Mount Kit RK124
Power supply/
Power consumption
Dimensions (WxHxD) 436.2x83.1x401.2mm
Weight 7.0kg
MX12/4—Owner’s Manual
7 bands (125, 250, 500, 1k, 2k, 4k, 8kHz)
±12 Maximum
USA and Canadian 120V AC 60Hz, 30W
General 230V AC 50Hz, 40W
■ Input specifications
Input
connectors
Gain
trim
Input
impedance
Nominal
impedance
Sensitivity
1
Input level
Nominal level
Input specifications 11
Max. before
clipping
Connector type
MIC INPUT
(1-8)
LINE INPUT
(1-8)
ST INPUT
(9-12)
RTN (L•R) 10kΩ 600Ω line –12dB (195mV) +4dB (1.23V) +20dB (7.75V)
MAX
MIN
MAX
MIN
MAX
MIN
5kΩ 50~600Ω mic
50kΩ 600Ω line
10kΩ 600Ω line
–90dB (24.5µV)
–36dB (12.3mV)
–64dB (490µV)
–10dB (245mV)
–54dB (1.55mV)
–10dB (245mV)
–60dB (775µV)
–16dB (123mV)
–34dB (15.5mV)
+10dB (2.45V)
–34dB (15.5mV)
+10dB (2.45V)
–40dB (7.75mV)
+4dB (1.23V)
–14dB (155mV)
+30dB (24.5V)
–14dB (155mV)
+30dB (24.5V)
XLR3-31 type
Phone jack (TRS)
Phone jack
Phone jack
3
3
TAPE IN (L•R) 10kΩ 600Ω line –26dBV (50.1mV) –10dBV (316mV) +18dBV (7.75V) RCA pin jack
INS I/O (1-4) 10kΩ 600Ω line –20dB (77.5mV) 0dB (775mV) +20dB (7.75V) Phone jack (I/O)
1. Sensitivity is the lowest lev el that will produce an output of +4 dB (1.23V) or the nominal output le v el when the unit is set to maximum gain.
2. XLR type connectors and phone jacks (TRS) (T=Hot, R=Cold, S=Gnd) are balanced.
3. Phone jacks are unbalanced.
4. Phone jacks (I/O) (T=OUT, R=IN, S=GND) are unbalanced.
• 0dB=0.775Vrms, 0dBV=1Vrms
■ Output specifications
Output level
Max. before clipping
Connector type
2
Phone jack
Phone jack
2
2
4
1
3
Output connector
Output
impedance
Nominal
impedance
Nominal
ST OUTPUT (L•R) 150Ω 600Ω Lines +4dB (1.23V) +24dB (12.3V) XLR-3-32 type
GROUP OUTPUT (1-4) 75Ω 600Ω Lines +4dB (1.23V) +20dB (7.75V) Phone jack
MONITOR1 OUT 75Ω 600Ω Lines +4dB (1.23V) +20dB (7.75V)
SEND MONI1,
EFFECT/MONI2
75Ω 600Ω Lines +4dB (1.23V) +20dB (7.75V)
C-R OUT 470Ω 10kΩ Lines +4dB (1.23V) +20dB (7.75V) ST phone jack
REC OUT (L•R) 600Ω 10kΩ Lines –10dBV (316mV) +10dBV (3.16V) RCA pin jack
PHONES 100Ω 40Ω Phones 3mW 100mW ST phone jack
INS I/O (1-4) 600Ω 10kΩ Lines 0dB (775mV) +20dB (7.75V) Phone jack
1. XLR type connectors are balanced.
2. Phone jacks are unbalanced.
3. ST phone jacks (T=L, R=R, S=GND) are unbalanced.
4. Phone jacks (I/O) (T=OUT, R=IN, S-GND) are unbalansed.
• 0dB=0.775Vrms, 0dBV=1Vrms
2
2
4
MX12/4—Owner’s Manual
12 Specifications
■ Dimensions
310
H:83.1
76.6
3.2
13.5
320
W:436.2
Specifications are subject to change without prior notice.
D:401.2
Units：mm
MX12/4—Owner’s Manual
■ Block and Level diagram
T
Block and Level diagram 13
INPUT
INPUT
INPUT
9/10
11/12
1-4
5-8
L(MONO)
MIC
LINE
MIC
LINE
R
PHANTOM
PHANTOM
MASTER
PAD
PAD
INS
I/O
HA
GAIN
HA
GAIN
HA EQ
GAIN
LOW
L(MONO)
RTN
(from EFFECT)
VOCAL
L HALL
S HALL
TAPE IN
EQ
MID
LOW
EQ
LOW
MID
MID HIGH
EQHA
R
L
R
HIGH
HIGH
DSP
PEAK
PEAK
PEAK
GROUP ST
PAN
EFFECT
MONI
PAN
EFFECT
MONI
BAL
EFFECT
MONI
ST
MONI
ON
ST
MONI
ST
EFFECT
MONI
RL4321
1
2
GROUP
OUTPUT
3
4
L
REC OU
R
L
ST
OUTPUT
R
MONI 1
SEND
EFFECT/
MONI 2
C-R OUT
PHONES
GROUP 3 4
(to DSP)
GROUP 1
GROUP 2
GROUP 3
GROUP 4
PAD
7 BAND ST GEQ
ST
ST
MONI 1
EFFECT
MONI 2
EFFECT/
MONI 2
TAPE IN
250125
7 BAND ST GEQ
PAD
C-R.PHONES
8k4k
ST
EFFECT
/MONI
20 20
LINE
MIC
LINE
MIC
ST
ST
RTN
INS
TAPE
EFFECT
EFFECT,MONITOR,TAPE
EFFECT,MONITOR
GROUP,ST
GROUP,EFFECT,MONITOR
REC
ST
10
0
–10
–20
–30
–40
–50
MX12/4—Owner’s Manual
10
0
–10
–20
–30
–40
–50
–60–60
VV68420 R0 1 IP YAMAHA CORPORATION
P.O.Box 1, Hamamatsu, Japan
96 09 700 NP Printed in Taiwan
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