Yamaha Mx124 Instruction Manual

							MX12/6, 20/6 — Owner’s Manual
Applications9
Applications
Example 1) Sound Reinforcement for a live
performance
Procedure
qConnect 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.
wUse 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.
ePress each channel’s “ST” GROUP Select Switch.
rUse 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.
tUse 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 OUTAUX 1
SENDAUX 2 (PRE)
SENDINSERT I/O
C-R/PHONES
TAPE IN
REC OUT
RETURNEFFECT
SEND
INPUT GROUP OUT
1 – 4
MONO OUT
Microphone, Line InputGROUP 1-4 FadersCD 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 FadersPower Amplifier
MTR 
						

							MX12/6, 20/6 — Owner’s Manual
10Applications
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

qConnect 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.
wConnect 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.
eConnect the computer’s LINE OUT jack to the stereo INPUT channel jack.
rUse 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.

qSelect 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.*
wUse 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.

qSelect 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.
wUse 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 RecorderEffector
Effector 
						

							MX12/6, 20/6 — Owner’s Manual Frequency response20Hz—20kHz +1dB, -3dB     @+4dB, 600Ω (Input Gain control at minimum level)
Total harmonic distortion
						

							MX12/6, 20/6 — Owner’s Manual
12Supplement

 Input Specifications
Input Gain Input NominalInput level
Connector typeconnectors Control impedance impedance
Sensitivity *1 Nominal Max. before clipping
MIC INPUT-60
5kΩ50-600Ω 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
50kΩ600Ω 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
10kΩ600Ω 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) 10kΩ600Ω lines -12 dB (195mV) +4 dB (1.23V) +20 dB (7.75V) Phone jack *3
TAPE IN (L, R) 10kΩ600Ω lines -26 dBV (50.1mV) -10 dBV (316mV) +10 dBV (3.16V) RCA phono jack
CH INSERT IN
10kΩ600Ω 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 connectorsOutput NominalOutput level
Connector typeimpedance impedance
Nominal Max. before clipping
ST OUT (L, R) , MONO OUT 150Ω600Ω lines +4 dB (1.23V) +24 dB (12.3V) XLR-3-32 type *1
GROUP OUT (1-4)
AUX SEND (1, 2) 75Ω600Ω lines +4 dB (1.23V) +20 dB (7.75V) Phone jack (TRS) *2
EFFECT SEND
C-R/PHONES (L, R) 100Ω10kΩ lines +4 dB (1.23V) +20 dB (7.75V)
ST phone jack (TRS) *340Ω phones 3mW 75mW
REC OUT (L, R) 600Ω10kΩ lines -10 dBV (316mV) +10 dBV (3.16V) RCA phono jack
CH INSERT OUT (1-n *5) 600Ω10kΩ 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
58835
11835 35
< MX20/6 >
< MX12/6 >
46854.6
17.6
438
368
268
384
118
46Units: mm
Specifications are subject to change without prior notice. 
						

							MX12/6, 20/6 — Owner’s Manual
Supplement13
Block and Level Diagrams
+30dB+30dB+20dB+20dB+10dB+10dB0dB0dB-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]
FaderRETURN [+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
ControlMasterGROUP
FaderMasterMax. Before Clip
GROUP OUT [+4dB]
REC OUT [-10dBV]
ST
Fader MasterMONO Master 
ControlMax. Before Clip
ST OUT, MONO OUT [+4dB]
C-R/PHONESC-R/PHONES [+4dB@10kohms]
C-R/PHONES
[3mW@40ohms]CH INPUTMX12/6:1~4ch
MX20/6:1~8ch
MIC INPUT[-60~-16dB]LINE INPUT[-34~+10dB]INSERT I/O[0dB]
PADPHANTOM
(8ch/sw)from DC Power Supply
HA
GAIN[-60dB~-16dB]
[-34dB~+10dB][0dB]
Lo
Mid
Hi3-Stage EQ
PEAKCh.Fader[-10dB]
BA[0dB][0dB]
1-2
3-4
ST
[-6dB]
PAN
POSTAUX1
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)
PADHA
GAIN
[-60dB~-16dB]
[-34dB~+10dB][0dB]
Lo
Mid
Hi3-Stage EQ
PEAKCh.Fader[-10dB]
BA[0dB][0dB]
1-2
3-4
ST
[-6dB]
PAN
POSTAUX1
AUX2
EFFECT
ST INPUT
MX12/6: 9/10ch, 11/12ch
MX20/6:17/18ch, 19/20ch
[-34~+10dB]
L
RHA
HA
[0dB]GAIN[-34dB~+10dB]
3-Stage EQLo
Mid
Hi3-Stage EQ
PEAK
BABA
ST Ch.Fader[-10dB][0dB]SUMBAL
[0dB]POST
1-2
3-4
ST
[-6dB]AUX1
AUX2
EFFECT
TAPE IN
[-10dBV]
L
RBA
BA
[0dB][-6dB]
TAPE IN
RETURN
[+4dB]
L/MONO
RBA
BA
[+4dB]
[-2dB]
AUX2 ST
AUX1
[0dB]DIGITAL
EFFECT
ON
[-6dB]AUX2 ST
AUX1
STEREO R
EFFECTSTEREO L GROUP4 GROUP3GROUP2 GROUP1
AUX1
AUX2 STEREO R
EFFECT STEREO LGROUP4GROUP3GROUP2 GROUP1
AUX1
AUX2
GROUP1 Fader[0dB]
INV
INV
INV
INV SUM
SUM SUMSUM
[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
INVINV
[0dB][0dB]
BA
BA ST Fader[-10dB]
BA
SUM
REC OUT
[-10dBV][-6dB]R LGEQ GEQST 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
SUMINV
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)METERPEAKPEAK
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
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