Yamaha MX12/4 Owner's Manual page 9

2
RTN L (MONO), R
These are unbalanced phone type line input jacks, with a nominal input level and impedance
of +4dB/600 .
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/600 .
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 600 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/600 .
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/600 . 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/10k .
The source monitored by this jack is selected by the C-R•PHONES output select switch (mas-
ter control section C).
Note: An insertion cable can also be used when connecting this jack to a stereo monitor sys-
tem.
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).
7
Connector section
MX12/4—Owner's Manual