Yamaha GA24/12 - Manual (Page 4)

2
Front Panel
GA32/12, GA24/12—Owner’s Manual
Front Panel
Monaural input channels
The GA32/12 {GA24/12} has 28 {20} monaural input channels. They are located on both
sides of the master section and feature the same specifications.
A Pad switch
This switch is used to attenuate input signals by 26 dB. Press down the switch to turn the
pad on.
B GAIN control
This control knob is used to adjust input sensitivity. The adjustable range is –16 dB to
–60 dB when the pad switch
1 is turned off, and +10 dB to –34 dB when the pad switch is
turned on.
C Ø (Phase) switch
This switch reverses the phase of input signals. Press down this switch to reverse the phase.
D High pass filter switch
This high pass filter is used to cut the frequency range below 80 Hz with a slope of 12 dB/
oct. Press down the switch to turn the high pass filter on.
E PEAK indicator
This indicator lights up when the level of signals that pass the EQ reaches 3 dB below the
clipping level.
F EQ controls (HIGH/HI-MID/LO-MID/LOW)
This 4-band equalizer provides
±
15 dB of cut and boost over each range, with the center
frequencies and types shown in the following table. The frequencies for HI-MID and LO-
MID are variable.
G EQ switch
This switch is used to turn equalization on and off. Press down the switch to turn
equalization on.
H M1–M4 mix level controls
These controls are used to route the post fader signals from the input channel to MIX
buses 1–4.
Band Center frequencies Type
HIGH 10 kHz shelving
HI-MID 400 Hz–8 kHz peaking (parametric)
LO-MID 80 Hz–1.6 kHz peaking (parametric)
LOW 100 Hz shelving
Note: When you press down the M1–M4 switches to the FIX position in the Variable/
Fix select section (see page 6), the output level of the signals routed to the MIX buses will
be fixed and the corresponding M1–M4 mix level controls will be disabled.
26dB
EQ
ON
ON
+10 –34
+15 –15
–60 –16
+15 –15
+15 –15
+15 –15
10 0
10 0
8k 400
1.6k 80
80
GAIN
PEAK
HIGH
LOW
M1
M2
10 0
M3
ON
10 0
M4
ON
10 0
M5
PRE
10 0
M6
PRE
10 0
M8
PRE
10 0
R L
M10
PAN
ST ON
PFL
10 0
M7
10 0
M9
HI-MID
LO-MID
10
5
0
5
10
20
30
40
50
60
3
4
7
B
D
E
F
6
9
A
2
1
5
C
8
0