MIXING CONSOLE

Owners Manual
Thank you for purchasing the YAMAHA MX12/6 or MX20/6 Mixing Console. 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 Owners 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 connection 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 microphones 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.

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 : BLUE : BROWN : EARTH NEUTRAL 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 Owners Manual

Important

Read the following before operating the MX12/6, 20/6

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 units power cord only to an AC outlet of the type stated in this Owners 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 units 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.

Front & Rear Panels

Channel Control Section
Channels 1-8 (MX12/6) 1-16 (MX20/6) (Monaural) Channels 9-12 (MX12/6) 17-20 (MX20/6) (Stereo)

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 e

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 r r t t

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.

+20 +15

Response [dB]
+10 +1k Frequency [Hz] 10k 20k
r AUX1, AUX2 Controls t POST Switch o
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.

The MX12/6s panel is used for all following illustrations in this 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.

from DC Power Supply

PHANTOM

(8ch/sw) PEAK

MIC INPUT

[-60~-16dB]

PAN HA PAD GAIN
[-60dB~-16dB] [-34dB~+10dB] [0dB]

3-Stage EQ

[0dB] 1-2 3-4 ST [-6dB]

BA Ch.Fader

[-10dB]
MX12/6:1~4ch MX20/6:1~8ch

[-34~+10dB]

CH INPUT

LINE INPUT

INSERT I/O

AUX1 POST AUX2 EFFECT

(8ch/sw)
MX12/6:5~8ch MX20/6:9~16ch

HA L ST INPUT

MX12/6: 9/10ch, 11/12ch MX20/6:17/18ch, 19/20ch [-34~+10dB]

PEAK [-10dB]

1-2 3-4 ST [-6dB]

ST Ch.Fader BA

[-34dB~+10dB]

AUX1 SUM POST AUX2

EFFECT
GROUP1 GROUP2 GROUP3 GROUP4 STEREO L STEREO R AUX1 AUX2 EFFECT

Master Control Section

q ST Master Fader o !3 !4

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.

!2 w i !1 t y u !0

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 q

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.

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 HALL 1 HALL 2 HALL 3 ROOM PLATE 1 PLATE 2 PLATE 3 GATE REVERB
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 builtin 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.
Signal TAPE IN ST GROUP 1-2 GROUP 3-4 ? 1-2 > 3-4 N/A N/A ? 1-2 > 3-4 ? ST Switch > GROUP N/A ? ST > GROUP > GROUP ? > TAPE IN > TAPE IN ? ? ?

!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 units 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.

Connector Section

q INPUT Jacks (MX12/6:CH1-8, MX20/6:CH1-16)
MIC LINE Balanced XLR type microphone input jacks (1:Ground, 2:Hot, 3:Cold). These input jacks are compatible with 50-600 microphones. Balanced TRS phone type line input jacks (T:Hot, R:Cold, S:Ground). These input jacks are compatible with 600 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.
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 600 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/600. 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/600. This signal is the monaural mix of the STEREO buss 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/40). It can also be used as a stereo phone type output jack for connecting a monitor system (nominal output/impedance of +4dB/10k). 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)

Rear Panel

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/ 600 and a nominal output/impedance of 0dB/ 10k. 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. Connecting 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.
to the input jack of the external processor to the INSERT I/O jack
Sleeve Sleeve Ring Tip Tip
to the output jack of the external processor

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. 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/ 600. 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.
EFFECT This is an impedance balanced phone type output jack with a nominal output/impedance of +4dB/ 600. 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/600. 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/600. 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 () Tip: hot (+) Ring: cold () Sleeve: ground Tip: Output Ring: Input Sleeve: ground Tip: L Ring: R Sleeve: ground Tip: hot Sleeve: ground Sleeve Tip Sleeve Tip INPUT OUTPUT

LINE INPUT, GROUP OUT, AUX 1/AUX 2/EFFECT SEND INSERT I/O

C-R/PHONES

STEREO INPUT, RETURN

Applications

Example 1) Sound Reinforcement for a live performance
Main Speakers Monitor Speakers Sub Woofer, etc.
Effector Power Amplifier Power Amplifier Power Amplifier

Headphones

AUX 1 SEND

AUX 2 (PRE) SEND

ST OUT MONO OUT
C-R/PHONES TAPE IN REC OUT
MTR CD Recorder, DAT, etc.

GROUP OUT 14

EFFECT SEND

Effector

Set the POST Switch to ? (AUX2=PRE). Group Select Switches

RETURN

C-R/PHONES Output and Meter Select Switch

Channel Faders

ST Master Fader
Microphone, Line Input GROUP 1-4 Faders

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 channels 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.
Example 2) Home Recording
Headphones Powered Speakers (for monitoring)

C-R/PHONES GROUP OUT 1

AUX 2 (POST) SEND
4 LINE IN (Audio Card, etc.)

Master Recorder

ST OUT

INPUT (ST CH)

LINE OUT (Audio Card, etc.)

Computer

Tone Generator, Synthesizer, Microphone, etc.

<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 computers audio cards 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 computers 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.

Supplement

Specifications

I General specifications

Frequency response (CH MIC INPUT to ST, GROUP OUT/AUX, EFFECT SEND) Total harmonic distortion (CH MIC INPUT to ST, GROUP OUT/AUX, EFFECT SEND) Hum & Noise (Rs=150, 20Hz20kHz, INPUT GAIN=Max., Input Sensitivity=-60dB) * Measured with 12.7kHz, -6dB/oct. low pass filter. (Equivalent to 20kHz, -dB/oct. filter.) 20Hz20kHz +1dB, -3dB @+4dB, 600 (Input Gain control at minimum level)
<0.1% (THD+N) @+14dB, 20Hz20kHz, 600 -128dB -95dB -64dB (68dB S/N) Equivalent input noise Residual output noise ST OUT: Master fader and one channel fader at nominal level, channel assign switch ON. ST OUT: Master fader at nominal level, all channel assign switches OFF, all GROUP to ST switches OFF. GROUP OUT: Master fader at nominal level, all channel assign switches OFF. AUX SEND, EFFECT SEND: Master level control at nominal level, all channel send controls at minimum level.

-88dB (92dB S/N)

-89dB (93dB S/N) -82dB (86dB S/N)

Maximum voltage gain

60dB 84dB 84dB 94dB 76dB 86dB 58dB 58dB
CH MIC INPUT to CH INSERT OUT CH MIC INPUT to GROUP OUT CH MIC INPUT to ST OUT (CH to ST) CH MIC INPUT to ST OUT (GROUP to ST) CH MIC INPUT to AUX1 SEND, AUX2 SEND (PRE) CH MIC INPUT to AUX2 SEND (POST) , EFFECT SEND CH LINE INPUT to ST OUT (CH to ST) ST INPUT to ST OUT (CH to ST)
Monaural INPUT Gain control Stereo INPUT Gain control Crosstalk at 1kHz Input channel equalization
44dB variable 44dB variable -70dB adjacent input -70dB input to output (CH INPUT) 15dB Maximum HIGH MID LOW 10kHz shelving 2.5kHz peaking 100Hz shelving
* Turn over/Roll off frequency of shelving: 3dB below maximum variable level. Monaural and Stereo INPUT Peak Indicators Meters Graphic equalizer Internal digital effect Phantom power Lamp Connector Option Power supply Power consumption Dimensions (W x H x D) Weight Red: Each channel, when the level of the post EQ signal for each channel exceeds +17dB the indicator will light. 12 points LED xbands (125, 250, 500, 1k, 2k, 4k, 8kHz) 12 dB Maximum 16 types +48V (balanced) : Supplied when the PHANTOM +48V switch is ON. BNC type (Lamp Compatibility: AC or DC12V, 0.5A Max) Rack Mount Kit RK124 (for MX12/6) USA and Canadian: 120V AC 60Hz General: 230V AC 50Hz MX12/6: 45W MX12/6: 438 x 85 x 384 mm MX12/6: 7.0kg MX20/6: 55W MX20/6: 658 x 85 x 384 mm MX20/6: 9.5kg 0dB=0.775Vrms

For European Model Purchaser/User Information specified in EN55103-1 and EN55103-2. Inrush Current: 10A Conformed Environment: E1, E2, E3 and E4

I Input Specifications

Input connectors MIC INPUT (1-n *5) LINE INPUT (1-n *5) ST INPUT (*7) RETURN (L, R) TAPE IN (L, R) CH INSERT IN (1-n *6) Gain Control -60 -16 -34 +10 -34 +10 Input impedance 5k 50k 10k 10k 10k 10k Nominal impedance 50-600 mics 600 lines 600 lines 600 lines 600 lines 600 lines Input level Sensitivity *1 -80 dB (0.078mV) -36 dB (12.3mV) -54 dB (1.55mV) -10 dB (245mV) -54 dB (1.55mV) -10 dB (245mV) -12 dB (195mV) -26 dBV (50.1mV) -20 dB (77.5mV) *4 *5 *6 *7 Nominal -60 dB (0.775mV) -16 dB (123mV) -34 dB (15.5mV) +10 dB (2.45V) -34 dB (15.5mV) +10 dB (2.45V) +4 dB (1.23V) -10 dBV (316mV) 0 dB (0.775V) Max. before clipping -40 dB (7.75mV) +4 dB (1.23V) -14 dB (155mV) +30 dB (24.5V) -14 dB (155mV) +30 dB (24.5V) +20 dB (7.75V) +10 dBV (3.16V) +20 dB (7.75V) Connector type XLR-3-31 type *2 Phone jack (TRS) *2 RCA phono jack Phone jack *3 Phone jack *3 RCA phono jack Phone jack (I/O) *4
*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.
Phone jack (I/O) (T=Out, R=In, S=Gnd): unbalanced type. n=8 (MX12/6), n=16 (MX20/6) n=4 (MX12/6), n=8 (MX20/6) 9/10, 11/12 (MX12/6), 17/18, 19/20 (MX20/6)
0dB=0.775Vrms, 0dBV=1Vrms

I Output Specifications

Output connectors ST OUT (L, R) , MONO OUT GROUP OUT (1-4) AUX SEND (1, 2) EFFECT SEND C-R/PHONES (L, R) REC OUT (L, R) CH INSERT OUT (1-n *5) Output impedance Nominal impedance 600 lines 600 lines 10k lines 40 phones 10k lines 10k lines Output level Nominal +4 dB (1.23V) +4 dB (1.23V) +4 dB (1.23V) 3mW -10 dBV (316mV) 0 dB (0.775V) Max. before clipping +24 dB (12.3V) +20 dB (7.75V) +20 dB (7.75V) 75mW +10 dBV (3.16V) +20 dB (7.75V) Connector type XLR-3-32 type *1 Phone jack (TRS) *2
ST phone jack (TRS) *3 RCA phono jack 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

< MX20/6 >

< MX12/6 >

Units: mm
Specifications are subject to change without prior notice.

PHANTOM PAN

[0dB] 3-4 ST [-6dB] [0dB] [-10dB] [0dB] 1-2

SUM INV GROUP OUT 1

[+4dB]

MIC INPUT GROUP1 Fader

HA TO ST
GAIN AUX1 SUM INV GROUP OUT 2

[+4dB] [0dB]

[-60dB~-16dB] [-34dB~+10dB]
INSERT I/O POST GROUP2 Fader

Ch.Fader

AUX2 EFFECT SUM INV GROUP OUT 3
[0dB] 3-4 [0dB] [0dB] 1-2

(8ch/sw) [-10dB]

GROUP3 Fader
MIC INPUT TO ST G1-2/G3-4 GROUP OUT 4

ST [-6dB]

GAIN SUM GROUP4 Fader

[-10dB] [0dB]

PAD INV

AUX1 POST EFFECT AUX2

LEVEL(LED) METER

[0dB] 1-2 3-4 [-10dB]

HA BAL ST OUT R
BA ST Fader SUM INV GEQ BA

SUM GEQ

[0dB] [+4dB]

ST OUT L

ST Ch.Fader

ST INPUT

[-6dB]
BA AUX1 POST SUM MONO EFFECT L REC OUT R

[-10dBV] [-6dB]

HA AUX2 BA

MONO OUT

Block and Level Diagrams
BA ST/GROUP BA TAPE IN C-R/PHONES

[-16dB]

[3mW@40ohms] [+4dB@10kohms]

L TAPE IN

TAPE IN

[-10dBV]

BA ST AUX1

[-6dB] [+4dB]

[+4dB] [-2dB]

SUM INV AUX1 SEND

L/MONO AUX1 SUM INV AUX2 AUX2

[-6dB] [0dB]

AUX2 SEND

[0dB] [-6dB]

ST EFFECT
DIGITAL EFFECT ON AUX1 AUX2 PROGRAM PARAMETER

DIGITAL EFFECT

Max. Before Clip Max. Before Clip RETURN [+4dB] CH & ST INPUT to GROUP/STEREO [0dB]

Max. Before Clip

Max. Before Clip AUX SEND [+4dB] EFFECT SEND [+4dB]
Max. Before Clip GROUP OUT [+4dB] REC OUT [-10dBV] AUX EFFECT Master Control GROUP Master Fader ST OUT, MONO OUT [+4dB] C-R/PHONES [+4dB@10kohms]

+20dB +10dB

CH INPUT LINE IN GAIN Min.[+10dB]
ST INPUT GAIN Min.[+10dB]

INSERT I/O [0dB]

TAPE IN [-10dBV]
CH INPUT MIC IN GAIN Min.[-16dB]
RETURN to AUX/STEREO [-2dB] CH & ST INPUT to AUX/EFFECT [-6dB] TAPE IN & DSP to AUX/STEREO [-6dB]
C-R/PHONES [3mW@40ohms] C-R/PHONES
MONO Master Control ST Master Fader
10dB 20dB 30dB 40dB 50dB 60dB
CH INPUT LINE IN GAIN Max.[-34dB]
ST INPUT GAIN Max.[-34dB]
CH INPUT MIC IN GAIN Max.[-60dB]

YAMAHA CORPORATION

V629990 RCP 16 NP Printed in Taiwan Pro Audio & Digital Musical Instrument Division P.O. Box 3, Hamamatsu, 430-8651, Japan

BLOCK DIAGRAM

+30dB +20dB +10dB 10dB 20dB 30dB 40dB 50dB

C-R/PHONES

[3mW@40ohms] [+4dB@10kohms]
ST OUT, MONO OUT [+4dB] C-R/PHONES [+4dB@10kohms]

LEVEL(LED) METER

MX20/6 Rear Panel

C-R/PHONES [3mW@40ohms]

GENERAL SPECIFICATIONS

Frequency response

TAPE IN C-R/PHONES

Max. Before Clip

[-16dB]
(CH MIC INPUT to ST, GROUP OUT/AUX, EFFECT SEND)
20Hz20kHz +1dB, -3dB control at minimum level)

@+4dB, 600 (Input Gain

Total harmonic distortion
<0.1% (THD+N) @+14dB, 20Hz20kHz, 600

MONO Master Control

Hum & Noise
(Rs=150, 20Hz20kHz, INPUT GAIN=Max., Input Sensitivity=-60dB)

G1-2/G3-4

ST/GROUP

-128dB -95dB

Equivalent input noise Residual output noise

GROUP1 Fader

GROUP2 Fader

GROUP3 Fader

GROUP4 Fader

EFFECT

[-6dB]

DIGITAL EFFECT

[-10dB]
-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
* Measured with 12.7kHz, 6dB/oct. low pass filter. (Equivalent to 20kHz, dB/oct. filter.)
AUX SEND [+4dB] EFFECT SEND [+4dB]

ST Fader

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 2 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. BNC type (12V, 0.5A) Lamp Connector Rack Mount Kit RK124 (for MX12/6) Option Power requirement USA and Canadian:120V AC 60Hz General: 230V AC 50Hz Power consumption MX12/6: 45W MX20/6: 55W Dimensions (W H D) MX12/6: 384 mm (17-1/4 x 3-3/8 15-1/8) MX20/6: 384 mm (25-7/8 x 3-3/8 15-1/8) MX12/6: 7.0kg (15.4lbs.) MX20/6: 9.5kg (20.9lbs.) Weight 0dB=0.775Vrms

MIXING CONSOLES

ST OUT L

ST OUT R

MONO OUT

[+4dB]

GROUP OUT 1

GROUP OUT 2

GROUP OUT 3

GROUP OUT 4

EFFECT SEND

AUX1 SEND

AUX2 SEND

GROUP OUT [+4dB]

REC OUT [-10dBV]

REC OUT

[-10dBV]
AUX EFFECT Master Control

GROUP Master Fader

ST Master Fader

PROGRAM

PARAMETER

INPUT SPECIFICATIONS

Input connectors MIC INPUT (1-n *5)
RETURN to AUX/STEREO [-2dB] CH & ST INPUT to AUX/EFFECT [-6dB] TAPE IN & DSP to AUX/STEREO [-6dB]
Gain Control -60 -16 -34 +10 -34 +10
Input impedance 5k 50k 10k 10k 10k 10k
Nominal impedance 50-600 mics 600 lines 600 lines 600 lines 600 lines 600 lines
Input level Sensitivity *1 -80 dB (0.078mV) -36 dB (12.3mV) -54 dB (1.55mV) -10 dB (245mV) -54 dB (1.55mV) -10 dB (245mV) -12 dB (195mV) -26 dBV (50.1mV) -20 dB (77.5mV) Nominal -60 dB (0.775mV) -16 dB (123mV) -34 dB (15.5mV) +10 dB (2.45V) -34 dB (15.5mV) +10 dB (2.45V) +4 dB (1.23V) -10 dBV (316mV) 0 dB (0.775V) Max. before clipping -40 dB (7.75mV) +4 dB (1.23V) -14 dB (155mV) +30 dB (24.5V) -14 dB (155mV) +30 dB (24.5V) +20 dB (7.75V) +10 dBV (3.16V) +20 dB (7.75V)

Connector type XLR-3-31 type *2 Phone jack (TRS) *2 RCA phono jack Phone jack *3 Phone jack *3 RCA phono jack Phone jack (I/O) *4
CH & ST INPUT to GROUP/STEREO [0dB]

[0dB] 1-2

TAPE IN

[-2dB]

RETURN [+4dB]

TAPE IN [-10dBV]

DIGITAL EFFECT ON

ST Ch.Fader

Ch.Fader

from DC Power Supply

L/MONO

INSERT I/O [0dB]

3-Stage EQ

RETURN

[-60dB~-16dB] [-34dB~+10dB]
Max. Before Clip ST INPUT GAIN Min.[+10dB]

[-34dB~+10dB]

PHANTOM

(8ch/sw)

ST INPUT GAIN Max.[-34dB]
MX12/6: 9/10ch, 11/12ch MX20/6:17/18ch, 19/20ch [-34~+10dB]

INSERT I/O

LINE INPUT

[-60~-16dB]

[-34~+10dB]

MIC INPUT

ST INPUT
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]
MX12/6:1~4ch MX20/6:1~8ch

CH INPUT

MX12/6:5~8ch MX20/6:9~16ch
GROUP1 GROUP2 GROUP3 GROUP4 STEREO L STEREO R AUX1 AUX2 EFFECT
Mid Hi Lo Mid Lo Hi Mid Lo Hi
LINE INPUT (1-n *5) ST INPUT (*7) RETURN (L, R) TAPE IN (L, R) CH INSERT IN (1-n *6) *1 *2 *3 *4
Input sensitivity: the lowest level that will produce the nominal output level when the unit is set to maximum gain. XLR type connector, phone jack (TRS) (T=Hot, R=Cold, S=Gnd): balanced type. Phone jack: unbalanced type. 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 ST OUT (L, R) , MONO OUT GROUP OUT (1-4) AUX SEND (1, 2) EFFECT SEND C-R/PHONES (L, R) REC OUT (L, R) CH INSERT OUT (1-n *5) Output impedance Nominal impedance 600 lines 600 lines 10k lines 40 phones 10k lines 10k lines Output level Nominal +4 dB (1.23V) +4 dB (1.23V) +4 dB (1.23V) 3mW -10 dBV (316mV) 0 dB (0.775V) Max. before clipping +24 dB (12.3V) +20 dB (7.75V) +20 dB (7.75V) 75mW +10 dBV (3.16V) +20 dB (7.75V) Connector type XLR-3-32 type *1 Phone jack (TRS) *2
ST phone jack (TRS) *3 RCA phono jack 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

YAMAHA Web Site http://www.yamaha.co.jp/english/ http://www.yamaha.co.jp/product/proaudio/homeenglish/
Specifications and appearances are subject to change without notice.
This document is printed on chlorine-free (ECF) paper with soy ink.

LPA??? ??????

Printed in Japan
After the success of our MX12/4 mixer, our engineers returned to their drawing boards to see how they could improve on the solid performance and features that made the 12/4 so popular. What they came up, with we think youll like. The new MX series features two models. First is the MX12/6, a 12-channel mixer with 8 mono and 2 stereo input channels. Second is the MX20/6, a compact, 20-channel mixing console with 16 mono and 2 stereo input channels. Both units feature independent 6 bus outputs (4-Group and ST), three AUX buses (AUX 1, AUX 2, EFFECT) and an upgraded and expanded Digital Effects section for greater flexibility and performance. Weve added extensive grounding and protection to further reduced noise caused from static electricity. Finally, to ensure the utmost in reliability and performance, the MX series utilizes the highest grade of quality parts with strict screening of all parts, especially in parts directly related to sound quality. With the MX12/6 and MX20/6, Yamaha again delivers the superior performance, versatility that professionals demand features hard to find, at such an affordable price.
Mono & Stereo Input Channels

Inputs

Both mixers offer mono input channels with both balanced XLR-type microphone inputs and balanced TRS phone jack line inputs. For compatibility with condenser microphones both units feature switchable phantom power is supplied to mono channels and controlled with a single switch (CH1-8) on the MX12/6 and two switches (CH1-8 & 9-16) on the MX20/6. Direct connection of stereo line sources is provided with channels 9/10 & 11/12 on the 12/6 and channels 17/18 & 19/20 on the 20/6. Both RCA and TRS phone type jacks are provided.

Gain Trim

All mono and stereo channels are equipped with gain trim controls with LED peak indicators to facilitate level matching with a wide variety of sources.
AUX 1 is pre-fader while AUX 2 allows the selection of either pre- or post-fader signals.

Effect Send

Further signal routing is provided with the EFFECT send which can be used to send the signal to the on-board digital effects section or to an external effector.

3-band Channel EQ

Each channel is equipped with 3-band equalization that provides +/-15dB of control over high, mid and low frequencies centered at 10kHz (shelving), 2.5kHz (peaking) and 100Hz (shelving) respectively.
4-Group Plus Stereo Assignment & Channel Faders
Linear faders offer noise free operation that is both smooth and precise. Both mixers offer exceptional routing flexibility with three bus assign switches that allow routing of each channels signal to Group 1/2, 3/4 and/ or ST outputs.

Two AUX Buses

Two separate AUX buses can be used as sends for external effectors or a monitor system to offer signal routing flexibility.

MX20/6

Master Controls

7-Band Graphic Equalizer

Supplying additional processing on the stereo outputs the 7-band graphic equalizer provides overall response shaping and effective feedback control. able pre/post fader AUX 2 Send. The EFFECT send can be used for routing the signal to the on-board digital effects section or to an external effector.

Stereo Fader

A new 100mm stereo fader provides easier use and greater control over the stereo out level.
Flexible Monitoring & Metering
A C-R (control-room monitor)/PHONES jack with an independent level control can be switched to monitor the signal from the ST, Group 1/2, Group 3/4 outputs or Tape Inputs. The 12-segment peak-reading level meters offer accurate visual monitoring of the signal that is currently selected for monitoring. Controlled with the C-R/ PHONES control, the C-R/PHONES jack delivers a high quality signal providing use as an output jack for additional monitoring or monitoring via a pair of headphones.
GAIN Control PEAK Indicator ST GRAPHIC EQUALIZER
POWER Indicator LAMP Connector LEVEL Meter
Built-in 16 Digital Effects
To add a professional touch to your mix, the MX12/6 and 20/6 feature an expanded digital effects section that includes Vocal Reverb, Vocal Echo, Hall, Plate and their variations plus Room and Gate Reverb for a total of 16 digital effects. The selected effect can be applied to the ST, AUX1 and/or AUX2 signals. The Digital Effects section is supplied with an ON switch and a parameter control for adjusting parameters such as effect level, speed, etc. of the selected effect.
MONO Control & Output
Independent of the ST control, the MONO control delivers a monaural rendition of the Stereo signal to the XLR MONO output.

Tape In/Rec Out Jacks

These RCA type jacks provide easy connection of a tape deck for playback and recording. The Tape In signal has its own level control on the panel.
Equalizer SEND AUX1, AUX2 Controls POST Switch EFFECT Control
AUX1, AUX2 Controls EFFECT Control
MONO Control TAPE IN Control C-R/PHONES Output and Meter Select Switch C-R/PHONES Control 16 DIGITAL EFFECTS
AUX1, AUX2 Controls ST Control

Channel Insertion

Channels 1-4 on the 12/6 and channels 18 on the 20/6 are equipped with insert send/ return patch points for convenient insertion of outboard equipment such as compressor/ limiters, effectors, etc. These jacks can also be conveniently used as direct out jacks for recording.

Three AUX Sends

A feature hard to find in this price range, both mixers are provided with three AUX sends for extended signal routing. Auxiliary sends include a pre-fader AUX1 Send and select-

Group Faders

Group 1/2 and 3/4 signals can be kept independent of the stereo out signal or routed to the ST output by engaging the TO ST. Individual group outputs, located on the rear panel, plus stereo outputs provide the MX12/6 and 20/6 with a total of six outputs for versatile signal routing.

MX12/6

PAN Control
(MX12/6:CH1-8, MX20/6:CH1-16)

TO ST Switch

GROUP, ST Select Switches
PROGRAM Select Switch PARAMETER Control ON Switch AUX1, AUX2 Control ST Control

Control Knobs

Even small details like the mixers control knobs were given attention. The new control knobs offer a better feel and operation.

Channel Fader

GROUP 1-4 Faders

100mm ST Master Fader