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22 ML5000 User Guide
A MONO INPUT and EQ
A1 +48V. Switches +48VDC to the channel input
XLR for powering microphones or DI boxes that
need phantom power. The power is current limited
through 6800 ohm resistors to pins 2 and 3.
WARNING Do not connect unbalanced
sources or cables to inputs with phantom power
selected. To avoid loud clicks always mute the
channel before switching +48V on or off and
when plugging or unplugging microphones.
A2 GAIN. Adjusts the input sensitivity to match
the connected source to the internal 0dBu operating
level of the channel. Provides a variable 50dB
range from +10 to +60dB gain. The gain should be
set so that the channel meter averages ‘0’ with
loudest moments lighting ‘+6’. Reduce gain if the
red peak meter lights.
A3 PAD. Attenuates the input signal by 20dB for
connection to high level microphone or line sources.
When pad is selected the gain control adjusts from
–10dB attenuation to +40dB gain.
A4 POLARITY. Reverses the polarity of the
input signal. This is used to correct reverse wired
cables or sources, and can be effective in reducing
phasing problems between microphones or acoustic
feedback between the microphone and
loudspeakers.
A5 HPF FREQUENCY. Adjusts the cut off
frequency of the high pass filter between 20Hz and
400Hz to reduce low frequency source noise. The
filter attenuates frequencies below cut off by 12dB
per octave.
A6 HPF IN. Switches the high pass filter in or
out. When switched out the response extends to
lower than 10Hz.
Using the Filter
Switch in the filter and adjust the cut off frequency
to clean up sources that do not have much bass
content, for example drum kit overheads (set to
400Hz), reduce proximity popping on vocals (set
around 150Hz), reduce handling noise and stage
rumble, or protect the speakers from very low
frequency energy (set around 30 to 50Hz). Switch
out to preserve full sub energy for low frequency
sounds such as kick drum, bass and special effects.
10k1kHz100 30k
-35
-40
10
-30
-25
-20
-15
-10
-5
0dB
+5
+10
20Hz 400Hz
HIGH PASS FILTER
+48V
- 10 10
GAIN
20
4060
30
20Hz
400
100
50 200
O
PAD
HPF
40
20dB
Q
-15 +15
-15 +15
-15 +15
7kHz
3k
2kHz 20kHz
10k
HF
100Hz
50
20Hz 200Hz
150
LF
1kHz
LM
Q
-15 +15
HM
EQ IN
0.6 2.5
1.2
0.6 2.5
1.2
3kHz
500Hz
700
1k
15k
5k
7k
180
45
35Hz
60
450
300
22


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