8
Front and rear panel
—Owner’s Manual
■
Stereo input channels
Here are the two stereo input channels provided
by the GF24/12, GF16/12, and GF12/12. The
INPUT 21/22 and 23/24 {13/14 and 15/16 on the
GF16, and 9/10 and 11/12 on the GF12/12} jacks
(
6
and
0
of the connector section) are pairs of
connectors that let you control a stereo signal
using one input channel. If a cable is connected
only to the INPUT A 21L or 23L jack {13L or 15L
on the GF16/12, or 9L or 11L on the GF12/12},
the source will be controlled as a monaural sig-
nal.
1
A/B switch
This switch selects input jacks. When the switch
is in the upward position ( ) the input signal of
the INPUT A jack is selected (page 18,
6
of the
connector section). When the switch is in the
downward section ( ), the input signal of the
INPUT B jack is selected (
0
of the connector
section).
2
GAIN control
This adjusts the input sensitivity. The range of
levels that can be accommodated is +10 dB to
–34 dB.
3
High pass filter switch
This is an on/off switch for the high pass filter
that cuts the frequency range below 80 Hz at a
slope of 12 dB/octave. The high pass filter is on
when the switch is pressed in.
4
PEAK indicator
This is an indicator that detects post-EQ clipping.
It will light 3 dB before clipping, indicating that
the signal is near the clipping level. If this LED
lights, lower the GAIN control (
2
).
5
EQ controls (HIGH/MID/LOW)
This is a three-band equalizer that boosts/cuts
each frequency band over a
±
15 dB range. The
center frequency and equalizer type for each
band is shown below.
The response is flat when the knob is in the “
▼
”
position.
GAIN
HIGH
PEAK
A
B
+10 –34
–15 +15
80
MID
–15 +15
PFL
1–2
ON
3–4
ST
10
5
0
5
10
15
20
30
40
BAL
R
EVEN
L
ODD
PRE
PRE
1
2
3
4
5
6010
010
010
010
010
010
LOW
AUX
PRE
–15 +15
4
1

A

8

9

B

2
3
5
7

0

6

C

Band Center
frequency Type
HIGH 10 kHz shelving
MID 250 Hz peaking
LOW 100 Hz shelving