Controls and Connectors
EMX512SC/EMX312SC/EMX212S 25
POWER Section
PPHANTOM switch
This switch toggles +15V phantom power on and off. If
you set the switch on, the mixer supplies power to the
XLR mic input jacks on all channels (the INPUT B jacks
on channels 1 to 4, and the MIC jacks on channel pairs
5/6 to 11/12). Set this switch on when using one or more
condenser microphones.
When this switch is on, the mixer supplies DC +15V
power to pins 2 and 3 of all XLR input jacks.
•Be sure to leave this switch off if you do not need
phantom power.
•When using phantom power, do not connect any
devices other than condenser microphones to the
XLR input jacks. Other devices may be damaged if
connected to phantom power. This precaution does
not apply to balanced dynamic microphones, how-
ever, as these will not be affected by phantom power.
•To avoid damage to speakers, be sure to turn off the
power to the EMX itself and to any other power
amplifiers and power speakers before switching
phantom power on or off. We also recommend that
you turn all output controls (LEVEL knobs, MAS-
TER knobs, etc.) to minimum settings before operat-
ing the switch, to avoid risk of loud noises that could
cause hearing loss or device damage.
QLIMITER lamps
The lamp lights up when the amplified signal being output at
the corresponding SPEAKERS jack hits its maximum value.
The lamp indicates that the limiter has come on.
If the lamps are flashing frequently, the load on the amp
is too high and there is risk of damage to your equip-
ment. Reduce the setting of the MASTER knobs (G
and M) until the lamps flash only briefly or not at all.
RPOWER AMP switch
Selects the output that gets sent to the SPEAKERS jacks, as
follows.
Up (MAIN L/R):
SPEAKERS jacks A1 and A2 output the signal from
the MAIN L bus, and SPEAKERS jack B1 and B2
output the signal from the MAIN R bus. The MAIN
section’s MASTER knob G adjusts the output level at
all of the SPEAKERS jacks.
Down (MAIN(L+R)/MON):
SPEAKERS jacks A1 and A2 output a mix of the
signals from the MAIN L and MAIN R buses.
SPEAKERS jacks B1 and B2 output the signal
from the MONITOR bus. The MAIN section’s
MASTER knob G adjusts the level to the A jacks,
while the MONITOR section’s MASTER knob M
adjusts the level to the B jacks.
SYS Processing switch
This switch turns Yamaha Speaker Processing on or off.
The processor adjusts the speaker’s bass ranges so as to
compensate, for example, for lack of subwoofers. Note
however that the resulting frequency balance will vary
according to the speakers you are using.
TSTAND-BY switch
This switch mutes the input to channels 1 to 8. The
switch lights up to indicate that the mute has been turned
on. Note that the mute does not work on channels 9 to 12.
When using the mixer for live performances, you can
fill in gaps in the performance by turning on the
standby switch and feeding background music from a
CD player or other such device into channels 9 to 12.
UPOWER switch and lamp
This switch turns the EMX power ON and OFF. The
lamp lights up to indicate that the power in on.
Before turning the power ON or OFF, be sure to turn
both MASTER knobs (G and M) to “0”.

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