Filter
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6
Control panel
Input channel section
Mono input channels
The M3000A-56C provides 56 input channels, the
M3000A-40C provides 40 input channels, the
M3000A-32 provides 32 input channels, and the
M3000A-24 provides 24 input channels. All input
channels have the same specifications.
A
Phantom power switch/
+48 V
indicator
This switch turns the +48 V phantom power on/off
for each channel. When phantom power is on, the +48
V indicator located above the switch will light. If you
wish to use phantom power, first make sure that the
PHANTOM MASTER switch (page 28) located on the
rear panel is turned on.
B
GAIN
control
This control adjusts the input sensitivity. Levels sup-
ported are –16dB ~ –60 dB when the Pad switch (
3
)
is off, and +10dB ~ –34dB when the switch is on.
C
26 dB
pad switch
This switch attenuates the input signal by 26 dB.
When the switch is pressed ( ), the pad is on.
D
ø
(phase) switch
This switch reverses the phase of the input signal.
When the switch is pressed ( ), the phase is
reversed.
E
HPF
(high pass filter) control
This controls the cutoff frequency of the high pass fil-
ter. The range is 20Hz–400Hz.
F
HPF
switch
This switch turns the high pass filter on/off. When the
switch is pressed ( ), the high pass filter is on, and
the signal component below the frequency specified
by the HPF control (
5
) will be attenuated by 12 dB/
oct.
G
EQ
control
This is a four-band equalizer which can boost/cut
each band over range of
±
15 dB. HI-MID and LOW-
MID provide switches that let you change between
two settings of Q (filter steepness). The center fre-
quency, Q value, and gain range of each band are as
follows.
H
EQ
switch
This switches the equalizer on/off. When the switch is
pressed ( ), the equalizer is on.
GAIN
HI
HI-
MID
LO-
MID
LO
600
20090
30
+15–15
EQ
HPF
+48V
Ø
1.6k
600240
80
+15–15
8k
3k1.2k
0.4k
+15–15
20k
8k3k
1k
400
15050
20
–60–16
+15–15
100
PRE
PRE
M9
100
M10
100
M11
100
M14
PAN
M13
M12
M13/
M14
100
M16
PAN
M15
M15/
M16
100
100
100
100
100
100
PRE
PRE
M1
M2
M3
M4
M5
100
M6
100
M7
100
M8
26dB
–34
+10
1
2
3
4
5
6
8
P
P
P
O
P
J
I
7
J
L
K
M
N
Band
Center
frequency
Q Gain
HI 1 kHz–20 kHz 0.667
±
15 dB
HI-MID 0.4 kHz–8 kHz 1.41/2.88
LO-MID 80 Hz–1.6 kHz 1.41/2.88
LO 30 Hz–600 Hz 0.667