MIXING CONSOLE
Owner’s Manual
Thank you for purchasing the YAMAHA MX12/6 or MX20/6 Mixing Con-
sole. Both the MX12/6 and MX20/6 mixers are designed to provide the user
with an ideal balance of operability, functionality, and simplicity.
In order to get the most out of your MX12/6 or MX20/6 mixer and its
functions, and to enjoy years of trouble-free use, please read this Owner’s
Manual thoroughly and keep it in a safe place for future reference.
Features
• The MX12/6 offers 12 input channels that can be mixed into
stereo, monaural, or to four group outputs.
• The MX20/6 offers 20 input channels that can be mixed into
stereo, monaural, or to four group outputs.
• A C-R/PHONES jack offers easy connection to a sub amp for
monitoring. It allows monitoring of the main stereo output,
TAPE IN input and the signals from groups 1/2, 3/4.
• The mixer is equipped with a highly efficient, built-in digital
effects section. The built-in effects allow you to create
professional sounding mixes without the need of additional
equipment. An EFFECT SEND jack is also supplied to allow
the use of external effectors.
• Two AUX SEND/RETURN jacks are provided. Two separate
AUX buses can be used as sends for external effectors or a
monitor system.
• The mixer supplies phantom power to provide easy connec-
tion of condenser microphones that require an external
power source.
• The mixer is equipped with INSERT I/O jacks for input
channels 1-4 (MX12/6) or 1-8 (MX20/6) allowing individual
effects to be inserted into individual channels.
• Both XLR type mic input jacks and TRS phone line input
jacks are provided on channels 1-8 (MX12/6) or 1-16 (MX20/
6). Input channels 9-12 (MX12/6) or 17-20 (MX20/6) are
equipped with stereo line input jacks. The MX12/6 and
MX20/6 can handle a wide range of sources, from micro-
phones to line level devices and stereo output synthesizers.
• TAPE IN jacks and REC OUT jacks offer easy connection of
tape decks for playback and recording.
Contents
Front & Rear Panels ............................ 2
Channel Control Section ........................ 2
Master Control Section .......................... 4
Connector Section ................................. 6
Rear Panel ............................................. 7
Applications ............................................ 9
Supplement .......................................... 11
Specifications ....................................... 11
Dimensions .......................................... 12
Block and Level Diagrams.................... 13
Keep This Manual For Future Reference.
MX12/6, 20/6 — 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
The above statements apply ONLY to those products distributed by Yamaha Corporation of America or its subsidiaries.
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.
MX12/6, 20/6 — Owner’s Manual
Important
Read the following before operating the MX12/6, 20/6
Important 1
Warnings
• Do not place a container with liquid or small metal objects on top of this unit. Liquid or metal objects
inside this unit are a fire and electrical shock hazard.
• Do not allow water to enter this unit or allow the unit to become wet. Fire or electrical shock may result.
• Connect this unit’s power cord only to an AC outlet of the type stated in this Owner’s Manual or as
marked on the unit. Failure to do so is a fire and electrical shock hazard.
• Do not scratch, bend, twist, pull, or heat the power cord. A damaged power cord is a fire and electrical
shock hazard.
• Do not place heavy objects, including this unit, on top of the power cord. A damaged power cord is a fire
and electrical shock hazard. In particular, be careful not to place heavy objects on a power cord covered
by a carpet.
• If you notice any abnormality, such as smoke, odor, or noise, or if a foreign object or liquid gets inside
the unit, turn it off immediately. Remove the power cord from the AC outlet. Consult your dealer for
repair. Using the unit in this condition is a fire and electrical shock hazard.
• Should this unit be dropped or the cabinet be damaged, turn the power switch off, remove the power
plug from the AC outlet, and contact your dealer. If you continue using the unit without heeding this
instruction, fire or electrical shock may result.
• If the power cord is damaged (i.e., cut or a bare wire is exposed), ask your dealer for a replacement. Using
the unit with a damaged power cord is a fire and electrical shock hazard.
• Do not remove the unit’s cover. You could receive an electrical shock. If you think internal inspection,
maintenance, or repair is necessary, contact your dealer.
• Do not modify the unit. Doing so is a fire and electrical shock hazard.
• If lightning begins to occur, turn off the power switch of the unit as soon as possible, and unplug the
power cable plug from the electrical outlet.
• If there is a possibility of lightning, do not touch the power cable plug if it is still connected. Doing so
may be an electrical shock hazard.
Cautions
• Hold the power cord plug when disconnecting it from an AC outlet. Never pull the cord. A damaged
power cord is a potential fire and electrical shock hazard.
• Do not touch the power plug with wet hands. Doing so is a potential electrical shock hazard.
Operating Notes
• Using a mobile telephone near this unit may induce noise. If noise occurs, use the telephone away from
the unit.
• XLR-type connectors are wired as follows:
pin 1: ground, pin 2: hot (+), and pin 3: cold (-).
• Insert TRS phone jacks are wired as follows: sleeve: ground, tip: send, and ring: return.
• The performance of components with moving contacts, such switches, rotary controls, faders, and
connectors, deteriorates over time. The rate of deterioration depends on the operating environment and
is unavoidable. Consult your dealer about replacing defective components.
MX12/6, 20/6 — Owner’s Manual
2 Front & Rear Panels
q
y
t
o
u
e
ii
t
rr
w
The MX12/6’s panel is used for all following
illustrations in this manual.
Channels
1-8 (MX12/6)
1-16 (MX20/6)
(Monaural)
Channels
9-12 (MX12/6)
17-20 (MX20/6)
(Stereo)
Response [dB]
+5
+10
+15
–15
–10
–5
0
Frequency [Hz]
10k1k100 20k20
+20
–20
Front & Rear Panels
Channel Control Section
q GAIN Control
Adjusts the input level of the signal entering the mixer to an
optimum level.
To obtain an optimum balance between the S/N ratio and
dynamic range, adjust the level so that the peak indicator w
occasionally lights.
-60 to -16 indicates the MIC input adjustment level, -34 to +10
indicates the LINE input adjustment level.
w PEAK Indicator
The indicator detects peaks in the signal after it has passed the
EQ.
The indicator will light red when the level reaches +17dB to
warn that clipping is imminent.
e Equalizer
Provides +/-15dB of control over high, mid and low frequency
ranges at the center frequencies listed below.
HIGH : 10kHz (shelving)
MID : 2.5 kHz (peaking)
LOW : 100Hz (shelving)
Frequency response will be flat when the knob is positioned at
“G”.
r AUX1, AUX2 Controls
t POST Switch
Individually controls the level of the signal sent from each
channel to the AUX1 and AUX2 buses.
The signal taken from before the channel fader is sent to
AUX1.
Depending upon the POST switch setting, the signal taken
from either before (POST Switch = ?) or after (POST Switch
= >) the channel fader is sent to AUX2.
When a stereo channel is used, L and R signals are combined
and sent to the AUX1 and AUX2 buses.
MX12/6, 20/6 — Owner’s Manual
y EFFECT Control
Controls the level of the signal sent from each channel to the EFFECT bus.
This control is located after the channel fader so its level will also be affected by the channel fader
setting.
When a stereo channel is used, L and R channel signals are combined and sent to the EFFECT bus.
u PAN Control (MX12/6:CH1-8, MX20/6:CH1-16)
BAL Control (MX12/6:CH9-12, MX20/6:CH17-20)
The PAN control knobs set the position within the stereo field of each signal that is sent to the GROUP
bus 1-2, GROUP bus 3-4 and STEREO bus L-R.
The BAL control knobs set the balance between left and right channels and assigns the signals that are
received at INPUT L (MX12/6:CH9, 11, MX20/6:CH17, 19) to GROUP buses 1/3 or STEREO bus L,
and the signals received at INPUT R (MX12/6:CH10, 12, MX20/6:CH18, 20) to GROUP buses 2/4 or
STEREO bus R.
i GROUP, ST Select Switches
Used to send the signal of each channel to the GROUP bus 1-2, GROUP bus 3-4 and STEREO bus L-R.
When the switch is ON (>), the signal is sent to the relative bus.
o Channel Fader
Controls the output level of the input channel signal and adjusts the volume balance between channels.
* Levels of unused faders should be lowered.
Front & Rear Panels 3
CH INPUT
MX12/6:1~4ch
MX20/6:1~8ch
MIC INPUT
[-60~-16dB]
LINE INPUT
[-34~+10dB]
INSERT I/O
[0dB]
PAD
PHANTOM
(8ch/sw)
from DC Power Supply
HA
GAIN
[-60dB~-16dB]
[-34dB~+10dB]
[0dB]
Lo
Mid
Hi
3-Stage EQ
PEAK
Ch.Fader
[-10dB]
BA
[0dB]
[0dB]
1-2
3-4
ST
[-6dB]
PAN
POST
AUX1
AUX2
EFFECT
CH INPUT
MX12/6:5~8ch
MX20/6:9~16ch
MIC INPUT
[-60~-16dB]
LINE INPUT
[-34~+10dB]
from DC Power Supply
PHANTOM
(8ch/sw)
PAD
HA
GAIN
[-60dB~-16dB]
[-34dB~+10dB]
[0dB]
Lo
Mid
Hi
3-Stage EQ
PEAK
Ch.Fader
[-10dB]
BA
[0dB]
[0dB]
1-2
3-4
ST
[-6dB]
PAN
POST
AUX1
AUX2
EFFECT
ST INPUT
MX12/6: 9/10ch, 11/12ch
MX20/6:17/18ch, 19/20ch
[-34~+10dB]
L
R
HA
HA
[0dB]
GAIN
[-34dB~+10dB]
3-Stage EQ
Lo
Mid
Hi
3-Stage EQ
PEAK
BA
BA
ST Ch.Fader
[-10dB]
[0dB]
SUM
BAL
[0dB]
POST
1-2
3-4
ST
[-6dB]
AUX1
AUX2
EFFECT
STEREO R
EFFECT
STEREO L
GROUP4
GROUP3
GROUP2
GROUP1
AUX1
AUX2
MX12/6, 20/6 — Owner’s Manual
4 Front & Rear Panels
q
!2
!0
er
i
w
!1
!3
!4
o
t y
u
q ST Master Fader
Controls the level of the signal that is sent to the ST
OUT jacks.
w MONO Control
Controls the level of the signal (the monaural signal
that is formed by combining the signals from the
STEREO bus) that is sent to the MONO OUT jack.
e GROUP 1-4 Faders
r TO ST Switch
Controls the level of the GROUP 1-4 signals, and
sends the signals to their respective GROUP
OUTPUT 1-4 jacks.
Also, when the TO ST switch is ON (>), the signals
whose levels are controlled by the GROUP faders are
also sent to the STEREO bus.
t SEND
• AUX1, AUX2 Controls
Controls the individual levels of the AUX1 and
AUX2 signals that are sent to the AUX1 SEND
jack and AUX2 SEND jack.
• EFFECT Control
Controls the level of the EFFECT bus signal that
is sent to the EFFECT SEND jack.
* This control is not related to, and has no affect on the
signal that is sent from the EFFECT bus to the built-in
digital effects.
y RETURN
• AUX1, AUX2 Controls
Controls the levels of the signals (mixed, L with
R) that are sent to the AUX1 and AUX2 buses
from the RETURN L (MONO) and R jacks.
• ST Control
Controls the level of the signal that is sent from
the RETURN L(MONO), R jacks to the STEREO
bus.
* When only the RETURN L (MONO) jack is used, the
same signal is also sent to the STEREO bus L, R.
Master Control Section
MX12/6, 20/6 — Owner’s Manual
Front & Rear Panels 5
u DIGITAL EFFECT
• PROGRAM Select Switch
Selects a program from the built-in digital effects.
VOCAL ECHO 1
VOCAL ECHO 2
VOCAL ECHO 3
VOCAL ECHO 4
VOCAL REVERB 1
VOCAL REVERB 2
VOCAL REVERB 3
VOCAL REVERB 4
• PARAMETER Control
Controls parameters (effect level, speed, etc.) of the selected effect program.
• ON Switch
Switches the built-in digital effect ON (>) or OFF (?). When set to OFF, the signal from the built-
in effect is not sent.
• AUX1, AUX2 Control
Controls the level of the signal that is sent from the built-in digital effects to the AUX1 and AUX2
buses.
• ST Control
Controls the level of the signal that is sent from the built-in digital effects to the STEREO bus.
i TAPE IN Control
Controls the level of the signal that is sent from the TAPE IN jack to the STEREO bus.
o ST GRAPHIC EQUALIZER
A stereo 7-band graphic equalizer that offers tone adjustment to the signal that is output to the ST OUT
jacks.
A +/-12dB boost or cut is provided at each of the frequency bands 125, 250, 500, 1k, 2k, 4k and 8kHz.
!0 C-R/PHONES Output and Meter Select Switch
Selects the signal that is sent to the C-R/PHONES jack and the level meter.
The three switches are used in combination to select TAPE IN, ST, GROUP 1-2 and GROUP 3-4 signals.
HALL 1
HALL 2
HALL 3
ROOM
PLATE 1
PLATE 2
PLATE 3
GATE REVERB
Signal
Switch
? 1-2 > 3-4 ? ST > GROUP ? > TAPE IN
TAPE IN N/A N/A > TAPE IN
ST N/A ? ST ?
GROUP 1-2 ? 1-2 > GROUP ?
GROUP 3-4 > 3-4 > GROUP ?
!1 C-R/PHONES Control
Controls the level of the signal that is sent to the C-R/PHONES jack.
!2 LEVEL Meter
The LEDs indicate the output level of the signal selected with the C-R/PHONES output and Meter
Select Switch !0. “0” indicates a nominal level, and the PEAK indicator will light when clipping is
imminent.
!3 POWER Indicator
The indicator will light when the main unit’s power is ON.
!4 LAMP Connector
A BNC type lamp (AC or DC12V, 0.5A Max) can be attached here.
Refer to the Block Diagram on page 13.
MX12/6, 20/6 — Owner’s Manual
6 Front & Rear Panels
qwrt
e
q INPUT Jacks (MX12/6:CH1-8, MX20/6:CH1-16)
• MIC Balanced XLR type microphone input jacks (1:Ground, 2:Hot, 3:Cold).
These input jacks are compatible with 50-600Ω microphones.
• LINE Balanced TRS phone type line input jacks (T:Hot, R:Cold, S:Ground).
These input jacks are compatible with 600Ω line level devices.
Unbalanced phone plugs can be connected but noise may enter the signal if the cables are
too long or if the location is susceptible to electromagnetic interference.
Connector Section
NOTE: It is not possible to simultaneously use both the MIC INPUT jack and the LINE INPUT
jack on any individual channel. Please use only one or the other jack.
w INPUT Jacks (MX12/6:CH9-12, MX20/6:CH17-20)
Unbalanced phone type and RCA pin type stereo line input jacks.
These inputs are compatible with 600Ω line level devices.
NOTE: It is not possible to simultaneously use both the phone type and RCA pin type jacks for an
individual input channel. Please use only one or the other jack.
e ST OUT (L, R) Jacks
Balanced XLR type output jacks with a nominal output/impedance of +4dB/600Ω.
These jacks deliver stereo output of the mixed signal and are connected to a power amplifier, etc. that
drives the main speakers.
The outputs can also be used for recording with the level of the signal controlled by the ST Master
Fader.
r MONO OUT Jack
Balanced XLR type output jack with a nominal output/impedance of +4dB/600Ω.
This signal is the monaural mix of the STEREO bus’s stereo signal. Its level is controlled with the
MONO control.
t C-R/PHONES Jack
Stereo phone type output jack for connecting a set of headphones (nominal output/impedance of
3mW/40Ω).
It can also be used as a stereo phone type output jack for connecting a monitor system (nominal
output/impedance of +4dB/10kΩ).
The source that is monitored with this jack is selected with the C-R/PHONES Output and Meter Select
Switch (Master Control Section).
NOTE: When this jack is connected to a monitor system, an insertion cable (optional YAMAHA
insertion cable YIC025/050/070, etc.) may be used. (Tip:L, Ring:R, Sleeve:Ground)
MX12/6, 20/6 — Owner’s Manual
Front & Rear Panels 7
q INSERT I/O Jack (MX12/6:CH1-4, MX20/6:CH1-8)
These are input/output jacks that are positioned
between the equalizer and fader of the input
channel.
They have a nominal input/impedance of 0dB/
600Ω and a nominal output/impedance of 0dB/
10kΩ.
These jacks can be used to connect devices such
as a graphic equalizer, compressor, noise filter,
etc.
The TRS type phone jack allows bi-directional
connection with the INSERT I/O jack. Connect-
ing a device to these jacks will require a special
insertion cable like the one shown in the diagram
on the right. Please use an optional YAMAHA
Insertion Cable YIC025/050/070, etc.
w PHANTOM +48V Switch
Turns the phantom power ON/OFF for all channels 1-8.
The MX20/6 has an additional PHANTOM switch for channels 9-16.
Turn the switch ON when you are using condenser microphones, etc.
When the switch is ON, +48V DC is supplied to pins 2 and 3 of the XLR type MIC INPUT connectors.
If phantom power is not required, make sure the switch is set to the OFF position.
Rear Panel
qerty
w
u
i
to the INSERT I/O
jack
to the input jack of
the external processor
to the output jack of
the external processor
TipSleeve
Ring
Tip
Sleeve
NOTE: With this switch turned ON, it is not a problem to connect balanced dynamic microphones
or line level devices however, hum or malfunction may occur when connecting unbalanced devices
or devices for which the center of the transformer is ungrounded.
e SEND Jack
• AUX1, AUX2
These are impedance balanced phone type output jacks with a nominal output/impedance of +4dB/
600Ω.
The AUX1, 2 bus signals are output from their respective jacks. The jacks can be used to send the
signal to a monitor system such as a cue-box.
MX12/6, 20/6 — Owner’s Manual
8 Front & Rear Panels
• EFFECT
This is an impedance balanced phone type output jack with a nominal output/impedance of +4dB/
600Ω.
The EFFECT bus signal is sent from this jack. This jack is used to send the signal to an external
effector, etc.
r RETURN L (MONO), R Jacks
These are unbalanced phone type line input jacks with a nominal input/impedance of +4dB/600Ω.
The signal received by these jacks is sent to the STEREO bus, AUX1 and AUX2 buses.
These jacks are normally used to receive a return signal from an external effector such as reverb, delay,
etc., but they can also be used as an auxiliary stereo input. If only the L (MONO) jack is used, the same
signal will be sent to both the R and L jacks for monaural input.
t GROUP OUT (1-4) Jacks
These are impedance balanced phone type output jacks that deliver the GROUP bus 1-4 signals, with a
nominal output/impedance of +4dB/600Ω.
These jacks are normally connected to the input jacks on an MTR or external mixer.
y TAPE IN (L, R) Jacks
These are line input jacks for monitoring an external DAT recorder or CD player. The signal received by
these jacks is sent to the STEREO bus. In this case, the TAPE IN control is used to adjust the input level
of the signal. You can also monitor directly from the C-R/ PHONES jack by making the appropriate
selection with the C-R/PHONES Output and Meter Select Switch (Master Control Section).
u REC OUT (L, R) Jacks
With an external DAT recorder or cassette recorder connected to these jacks, you can record the same
signal that is sent from the ST OUT jacks.
The signal sent from these jacks is not affected by the ST Master Fader or Graphic EQ settings. Make
recording level adjustments on the recording device.
i POWER Switch
When the switch is in the ON position, the unit is powered.
When turning the power ON, first turn on the mixing console, then turn on the power amp or powered
speakers that are connected to the mixer.
Also, when turning the power OFF, turn off the power amp or powered speakers before turning off the
mixing console.
Connector polarity
MIC INPUT, ST OUT,
MONO OUT
Pin 1: ground
Pin 2: hot (+)
Pin 3: cold (–)
LINE INPUT, GROUP OUT,
AUX 1/AUX 2/EFFECT SEND
Tip: hot (+)
Ring: cold (–)
Sleeve: ground
INSERT I/O
Tip: Output
Ring: Input
Sleeve: ground
C-R/PHONES
Tip: L
Ring: R
Sleeve: ground
STEREO INPUT, RETURN
TipSleeve
Ring
TipSleeve
Tip: hot
Sleeve: ground
INPUT OUTPUT
MX12/6, 20/6 — Owner’s Manual
Applications 9
Applications
Example 1) Sound Reinforcement for a live
performance
Procedure
q Connect line input devices or microphones to the INPUT jacks and connect a power amp, that is
connected to the main speakers, to the ST OUT Jacks.
w Use the GAIN Control on each channel to adjust the level of the input signal from the device or
microphone that is connected to the input channel (refer to page 2), and use the Channel Fader to
adjust the level of the output signal that is sent to the Master Section. Basically, you should set the
Channel Fader close to the “0” position.
e Press each channel’s “ST” GROUP Select Switch.
r Use the ST Master Fader to adjust the level of the signal sent to the power amplifier. Basically, you
should set the Master Fader close to their “0” position.
t Use the volume control(s) on the power amp to adjust the volume of the speakers.
If necessary, use a monitoring device (a pair of headphones, monitor speakers, etc.), a recording device,
effector, etc.
ST OUT
AUX 1
SEND
AUX 2 (PRE)
SEND
INSERT I/O
C-R/PHONES
TAPE IN
REC OUT
RETURN
EFFECT
SEND
INPUT
GROUP OUT
1 – 4
MONO OUT
Microphone, Line Input
GROUP 1-4 Faders
CD Recorder, DAT, etc.
Sub Woofer, etc.
Main Speakers
Effector
Power Amplifier Power Amplifier
Effector
ST Master Fader
C-R/PHONES Output and Meter Select Switch
Monitor Speakers
Headphones
Set the POST Switch to “?”
(AUX2=PRE).
Group Select Switches
Channel Faders
Power Amplifier
MTR
MX12/6, 20/6 — Owner’s Manual
10 Applications
Example 2) Home Recording
AUX 2 (POST)
SEND
INSERT
I/O
C-R/PHONES
ST OUT
INPUT
(ST CH)
GROUP OUT
4
3
2
1
LINE OUT
LINE IN
RETURN
INPUT
Procedure
<Preparations>
q Connect a tone generator, synthesizer, microphone, etc. to the INPUT jacks, and connect a master
recorder such as an MD or CD to the ST OUT jacks.
w Connect a computer’s audio card’s LINE IN jack to the GROUP 3, 4 jacks and connect a pair of
powered speakers, etc. for monitoring to the GROUP 1, 2 jacks.
e Connect the computer’s LINE OUT jack to the stereo INPUT channel jack.
r Use the GAIN Control to adjust the level of the input signal from the tone generator, synthesizer,
microphone, etc. that is connected to each input channel (refer to page 2), and use the Channel Fader to
adjust the level of the output signal that is sent to the Master Section. Basically, you should set the
Channel Fader close to the “0” position.
<Recording>
q Select the channels you want to record to the computer by pressing their “3-4” GROUP Select Switches.
Also, select the channels you want to monitor by pressing their “1-2” GROUP Select Switches.*
w Use the GROUP 3, 4 Faders to adjust the level of the signal sent to the computer.
* Do not press the “3-4” GROUP Select Switches on the channels that carry the signal from the computer.
Doing so will result in a loop which may cause feedback.
<Mix Down>
q Select the channels you want to send to the master recorder by pressing their GROUP Select Switches
ST. Also, select the channels you want to simultaneously monitor by pressing their GROUP Select
Switches 1-2.
w Use the ST Master Fader to adjust the level of the signal output to the master recorder.
Tone Generator, Synthesizer, Microphone, etc.
Computer
(Audio Card, etc.)
Powered Speakers
(for monitoring)
(Audio Card, etc.)
Headphones
Master Recorder
Effector
Effector
MX12/6, 20/6 — Owner’s Manual
Frequency response 20Hz—20kHz +1dB, -3dB @+4dB, 600Ω (Input Gain control at minimum level)
Total harmonic distortion <0.1% (THD+N) @+14dB, 20Hz—20kHz, 600Ω
Hum & Noise -128dB Equivalent input noise
-95dB Residual output noise
-64dB (68dB S/N) ST OUT:
Master fader and one channel fader at nominal level, channel
assign switch ON.
-88dB (92dB S/N) ST OUT:
Master fader at nominal level, all channel assign switches
OFF, all GROUP to ST switches OFF.
-89dB (93dB S/N) GROUP OUT:
Master fader at nominal level, all channel assign switches OFF.
-82dB (86dB S/N) AUX SEND, EFFECT SEND:
Master level control at nominal level, all channel send controls
at minimum level.
Maximum voltage gain 60dB CH MIC INPUT to CH INSERT OUT
84dB CH MIC INPUT to GROUP OUT
84dB CH MIC INPUT to ST OUT (CH to ST)
94dB CH MIC INPUT to ST OUT (GROUP to ST)
76dB CH MIC INPUT to AUX1 SEND, AUX2 SEND (PRE)
86dB CH MIC INPUT to AUX2 SEND (POST) , EFFECT SEND
58dB CH LINE INPUT to ST OUT (CH to ST)
58dB ST INPUT to ST OUT (CH to ST)
Monaural INPUT Gain control 44dB variable
Stereo INPUT Gain control 44dB variable
Crosstalk at 1kHz -70dB adjacent input
-70dB input to output (CH INPUT)
Input channel equalization ±15dB Maximum
HIGH 10kHz shelving
MID 2.5kHz peaking
LOW 100Hz shelving
* Turn over/Roll off frequency of shelving: 3dB below maximum variable level.
Monaural and Stereo INPUT Peak Indicators Red: Each channel, when the level of the post EQ signal for each channel exceeds
+17dB the indicator will light.
Meters 12 points LED x2
Graphic equalizer 7 bands (125, 250, 500, 1k, 2k, 4k, 8kHz)
±12 dB Maximum
Internal digital effect 16 types
Phantom power +48V (balanced) : Supplied when the PHANTOM +48V switch is ON.
Lamp Connector BNC type (Lamp Compatibility: AC or DC12V, 0.5A Max)
Option Rack Mount Kit RK124 (for MX12/6)
Power supply USA and Canadian: 120V AC 60Hz
General: 230V AC 50Hz
Power consumption MX12/6: 45W MX20/6: 55W
Dimensions (W x H x D) MX12/6: 438 x 85 x 384 mm MX20/6: 658 x 85 x 384 mm
Weight MX12/6: 7.0kg MX20/6: 9.5kg
For European Model 0dB=0.775Vrms
Purchaser/User Information specified in EN55103-1 and EN55103-2.
Inrush Current: 10A
Conformed Environment: E1, E2, E3 and E4
Supplement
Specifications
■ General specifications
Supplement 11
(Rs=150Ω, 20Hz—20kHz, INPUT GAIN=Max.,
Input Sensitivity=-60dB)
* Measured with 12.7kHz, -6dB/oct. low pass filter.
(Equivalent to 20kHz, -
∞
dB/oct. filter.)
(CH MIC INPUT to ST, GROUP OUT/AUX, EFFECT SEND)
(CH MIC INPUT to ST, GROUP OUT/AUX, EFFECT SEND)
MX12/6, 20/6 — Owner’s Manual
12 Supplement
■ Input Specifications
Input Gain Input Nominal
Input level
Connector type
connectors Control impedance impedance
Sensitivity *1 Nominal Max. before clipping
MIC INPUT
-60
5kΩ 50-600Ω mics
-80 dB (0.078mV) -60 dB (0.775mV) -40 dB (7.75mV)
XLR-3-31 type *2
(1-n *5)
-16 -36 dB (12.3mV) -16 dB (123mV) +4 dB (1.23V)
LINE INPUT
-34
50kΩ 600Ω lines
-54 dB (1.55mV) -34 dB (15.5mV) -14 dB (155mV)
Phone jack (TRS) *2
(1-n *5)
+10 -10 dB (245mV) +10 dB (2.45V) +30 dB (24.5V)
ST INPUT
-34
10kΩ 600Ω lines
-54 dB (1.55mV) -34 dB (15.5mV) -14 dB (155mV)
RCA phono jack
(*7)
+10 -10 dB (245mV) +10 dB (2.45V) +30 dB (24.5V)
Phone jack *3
RETURN (L, R) 10kΩ 600Ω lines -12 dB (195mV) +4 dB (1.23V) +20 dB (7.75V) Phone jack *3
TAPE IN (L, R) 10kΩ 600Ω lines -26 dBV (50.1mV) -10 dBV (316mV) +10 dBV (3.16V) RCA phono jack
CH INSERT IN
10kΩ 600Ω lines -20 dB (77.5mV) 0 dB (0.775V) +20 dB (7.75V) Phone jack (I/O) *4
(1-n *6)
*1 Input sensitivity: the lowest level that will produce the nominal
output level when the unit is set to maximum gain.
*2 XLR type connector, phone jack (TRS) (T=Hot, R=Cold, S=Gnd):
balanced type.
*3 Phone jack: unbalanced type.
*4 Phone jack (I/O) (T=Out, R=In, S=Gnd): unbalanced type.
*5 n=8 (MX12/6), n=16 (MX20/6)
*6 n=4 (MX12/6), n=8 (MX20/6)
*7 9/10, 11/12 (MX12/6), 17/18, 19/20 (MX20/6)
• 0dB=0.775Vrms, 0dBV=1Vrms
■ Output Specifications
Output connectors
Output Nominal
Output level
Connector type
impedance impedance
Nominal Max. before clipping
ST OUT (L, R) , MONO OUT 150Ω 600Ω lines +4 dB (1.23V) +24 dB (12.3V) XLR-3-32 type *1
GROUP OUT (1-4)
AUX SEND (1, 2) 75Ω 600Ω lines +4 dB (1.23V) +20 dB (7.75V) Phone jack (TRS) *2
EFFECT SEND
C-R/PHONES (L, R) 100Ω
10kΩ lines +4 dB (1.23V) +20 dB (7.75V)
ST phone jack (TRS) *3
40Ω phones 3mW 75mW
REC OUT (L, R) 600Ω 10kΩ lines -10 dBV (316mV) +10 dBV (3.16V) RCA phono jack
CH INSERT OUT (1-n *5) 600Ω 10kΩ lines 0 dB (0.775V) +20 dB (7.75V) Phone jack (TRS) *4
*1 XLR type connector: balanced type.
*2 Phone jack (TRS) (T=Hot, R=Cold, S=Gnd): impedance balanced
type.
*3 ST phone jack (TRS) (T=L, R=R, S=Gnd): unbalanced type.
*4 Phone jack (I/O) (T=Out, R=In, S=Gnd): unbalanced type.
*5 n=4 (MX12/6), n=8 (MX20/6)
• 0dB=0.775Vrms, 0dBV=1Vrms
Dimensions
35
658
588
35
118
3535
< MX20/6 >
< MX12/6 >
46
85
4.6
17.6
438
368
268
384
118
46
Units: mm
Specifications are subject to change without prior notice.
MX12/6, 20/6 — Owner’s Manual
Supplement 13
Block and Level Diagrams
+30dB +30dB
+20dB +20dB
+10dB +10dB
0dB 0dB
-10dB –10dB
-20dB –20dB
-30dB –30dB
-40dB –40dB
-50dB –50dB
-60dB –60dB
CH INPUT LINE IN
GAIN Min.[+10dB]
CH INPUT MIC IN
GAIN Min.[-16dB]
CH INPUT LINE IN
GAIN Max.[-34dB]
CH INPUT MIC IN
GAIN Max.[-60dB]
ST INPUT
GAIN Min.[+10dB]
ST INPUT
GAIN Min.[+10dB]
ST INPUT
GAIN Max.[-34dB]
Max. Before Clip
INSERT I/O [0dB]
Max. Before Clip
TAPE IN [-10dBV]
Fader
RETURN [+4dB]
CH & ST INPUT to GROUP/STEREO [0dB]
RETURN to AUX/STEREO [-2dB]
CH & ST INPUT to AUX/EFFECT [-6dB]
TAPE IN & DSP to AUX/STEREO [-6dB]
Max. Before Clip
AUX SEND [+4dB]
EFFECT SEND [+4dB]
AUX
EFFECT
Control
Master
GROUP
Fader
Master
Max. Before Clip
GROUP OUT [+4dB]
REC OUT [-10dBV]
ST
Fader
Master
MONO Master
Control
Max. Before Clip
ST OUT, MONO OUT [+4dB]
C-R/PHONES
C-R/PHONES [+4dB@10kohms]
C-R/PHONES
[3mW@40ohms]
CH INPUT
MX12/6:1~4ch
MX20/6:1~8ch
MIC INPUT
[-60~-16dB]
LINE INPUT
[-34~+10dB]
INSERT I/O
[0dB]
PAD
PHANTOM
(8ch/sw)
from DC Power Supply
HA
GAIN
[-60dB~-16dB]
[-34dB~+10dB]
[0dB]
Lo
Mid
Hi
3-Stage EQ
PEAK
Ch.Fader
[-10dB]
BA
[0dB]
[0dB]
1-2
3-4
ST
[-6dB]
PAN
POST
AUX1
AUX2
EFFECT
CH INPUT
MX12/6:5~8ch
MX20/6:9~16ch
MIC INPUT
[-60~-16dB]
LINE INPUT
[-34~+10dB]
from DC Power Supply
PHANTOM
(8ch/sw)
PAD
HA
GAIN
[-60dB~-16dB]
[-34dB~+10dB]
[0dB]
Lo
Mid
Hi
3-Stage EQ
PEAK
Ch.Fader
[-10dB]
BA
[0dB]
[0dB]
1-2
3-4
ST
[-6dB]
PAN
POST
AUX1
AUX2
EFFECT
ST INPUT
MX12/6: 9/10ch, 11/12ch
MX20/6:17/18ch, 19/20ch
[-34~+10dB]
L
R
HA
HA
[0dB]
GAIN
[-34dB~+10dB]
3-Stage EQ
Lo
Mid
Hi
3-Stage EQ
PEAK
BA
BA
ST Ch.Fader
[-10dB]
[0dB]
SUM
BAL
[0dB]
POST
1-2
3-4
ST
[-6dB]
AUX1
AUX2
EFFECT
TAPE IN
[-10dBV]
L
R
BA
BA
[0dB]
[-6dB]
TAPE IN
RETURN
[+4dB]
L/MONO
R
BA
BA
[+4dB]
[-2dB]
AUX2
ST
AUX1
[0dB]
DIGITAL
EFFECT
ON
[-6dB]
AUX2
ST
AUX1
STEREO R
EFFECT
STEREO L
GROUP4
GROUP3
GROUP2
GROUP1
AUX1
AUX2
STEREO R
EFFECT
STEREO L
GROUP4
GROUP3
GROUP2
GROUP1
AUX1
AUX2
GROUP1 Fader
[0dB]
INV
INV
INV
INV
SUM
SUM
SUM
SUM
[0dB]
[0dB]
[0dB]
[0dB]
[0dB]
[-10dB]
GROUP2 Fader
[-10dB]
GROUP3 Fader
[-10dB]
GROUP4 Fader
[-10dB]
GROUP OUT 1
[+4dB]
GROUP OUT 2
[+4dB]
GROUP OUT 3
[+4dB]
GROUP OUT 4
[+4dB]
SUM
SUM
INV
INV
[0dB]
[0dB]
BA
BA
ST Fader
[-10dB]
BA
SUM
REC OUT
[-10dBV]
[-6dB]
R
L
GEQ
GEQ
ST OUT L
[+4dB]
ST OUT R
[+4dB]
MONO OUT
[+4dB]
SUM
SUM
[0dB]
[0dB]
AUX1 SEND
[+4dB]
AUX2 SEND
[+4dB]
AUX1
[-6dB]
AUX2
[-6dB]
INV
INV
SUM
INV
EFFECT SEND
[+4dB]
EFFECT
[-6dB]
PROGRAM
PARAMETER
DIGITAL
EFFECT
(INV)
LO
RO
[0dB]
IN
G1-2/G3-4
ST/GROUP
TAPE IN
C-R/PHONES
[-16dB]
BA
BA
DR
DR
C-R/PHONES
[3mW@40ohms]
[+4dB@10kohms]
LEVEL(LED)
METER
PEAK
PEAK
TO ST
TO ST
MONO
YAMAHA CORPORATION
Pro Audio & Digital Musical Instrument Division
P.O. Box 3, Hamamatsu, 430-8651, Japan
V629990 R2 1 CP 16
NP Printed in Taiwan
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