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30 SERIES GRAPHIC EQs
P
S
:
OWER
WITCH
LED.
P
LED:
Lights to indicate that the equalizer is turned on.
OWER
EQ I
/O
:
This switch removes the equalizer's input gain and individual slider controls from the signal
N
UT
path. This does not, however, affect the HI CUT and LOW CUT filters. The entire equalizer is
enabled when the switch is in.
B
/C
R
OOST
UT
ANGE
equalizer will use, either ±6dB or ±12dB (3031C: -10dB or -20dB)
H
B
EADROOM
AR
3dB below clipping and indicates overload at the post-input gain, pre-EQ and post-EQ points in the
signal path.. Overload at the input amplifier is indicated by the entire LED bar graph getting brighter
when the signal is 3dB below clipping.
I
G
C
NPUT
AIN
ONTROL
+15dB of gain. Its effect is indicated on the HEADROOM BAR GRAPH.
F
B
REQUENCY
AND
noted frequency by ±6 dB or ±12dB depending upon the position of the BOOST/CUT RANGE
SWITCH (3031C is cut only: -10db or -20db). When all of the sliders are in the center detented posi-
tion, the output of the equalizer is flat (3031C: sliders placed at top position is flat). The frequency
band centers of the 3215 are marked at 2/3rds of an octave ISO spacings. The frequency band cen-
ters of the 3031,3031C, and 3231 are marked at 1/3rd of an octave ISO spacing.
L
C
F
O
UT
REQUENCY
frequency of the LO-CUT filter. It is variable from 25 Hz to 200 Hz. The roll-off of this filter is 12dB
per octave. The LO CUT IN/OUT switch to the left of this control inserts or removes the LO CUT filter
from the signal path. When the LO CUT IN/OUT switch is pushed IN, the LO CUT filter is IN the cir-
cuit.
H
C
I
/O
S
I
UT
N
UT
the HI-CUT IN/OUT switch is pushed IN, the HI-CUT filter is IN in the circuit.
Turns the equalizer's power ON or OFF. Power ON is indicated by the lighted power
S
S
ELECTION
WITCH
G
:
The eight LEDÕs indicate peak levels within the equalizer. The top LED is
RAPH
:
This control sets the signal level to the equalizer. It is capable of -12dB to
S
C
:
LIDER
ONTROL
C
L
ONTROL AND
:
This switch inserts or removes the HI-CUT filter from the signal path. When
WITCH
:
The switch selects which of the two boost/cut ranges the
Each one of these slider potentiometers will boost or cut its
C
I
/O
S
O
UT
N
UT
WITCH
OPERATING CONTROLS
:
This control varies the cutoff