Allen&Heath GL2200 USER GUIDE - Manual (Page 11)

GL2200 U SER G UIDE 11
M
ONO
I
NPUT
C
HANNEL
The mono input channel is designed using a very high quality analogue signal path
to ensure absolute sonic purity for microphone or line level sources.
48V selects +48V to the XLR input for microphones that require phantom power.
IMPORTANT NOTE : Switch off channel +48V when non-phantom powered
mic, line or unbalanced sources are to be used with the inputs.
φ
reverses the POLARITY of the input source to correct the problems often
encountered in microphone placement, or due to incorrectly wired cables (pin 3
hot instead of pin 2). May also helpful in reducing acoustic feedback between
closely positioned loudspeakers and mics in live sound mixing.
PAD (LINE) selects the line level jack input when pressed or becomes a 30dB pad
for the XLR input when no jack is plugged in. The XLR is normalled through the
unplugged jack contacts. See MIC/LINE description above.
GAIN matches the level of the input source to the normal operating level of the
console. Adjust this to read an average ‘0dB’ on the channel meter (yellow LED).
Use the PFL system to listen to the signal and fine tune the gain.
100Hz 18dB/Octave lo-cut filter removes low frequency noise such as microphone
pops, proximity effect, stage noise and transport rumble after the pre-amp stage. It
can also be used to clean up sounds that do not have much bass content, such as
vocals and cymbals. The lo-cut filter is independent of the equaliser.
The 4-band EQ lets you adjust the tonal quality of the sound. The HF (treble) and
LF (bass) bands have a shelving response, which means that all frequencies
beyond the corner frequency are affected. Used with the 100Hz lo-cut filter you
can tailor the low frequency response exactly as you require. The centre flat
position is detented for quick resetting.
100 Hz lo-cut filter HF and LF EQ
1-2
3-4
PEAK
L-R
PFL
0
SIG
+6
ODD
L
6
AUX
AUX
5
AUX
4
AUX
3
2
AUX
1
AUX
EVEN
R
MUTE
EQ IN
1 Ø
100Hz
HF
12kHz
-15
0
+15
500Hz
3kHz
15kHz
-15
0
+15
MF1
250Hz
35Hz 1kHz
-15 +15
0 MF2
-15 +15
0
60Hz
LF
PRE
PAN C
5
5
OO
O O +6
O O +6
O O +6
O O +6
O O +6
O O +6
0
0
0
0
0
0
48V
PRE
10
20
30
10
0
20 - 10
30
60
40
PAD
GAIN
30
50
0
PAD
-30dB
vs
-60.00
-50.00
-40.00
-30.00
-20.00
-10.00
0.0
10.00
AMPL(dBr)
10 100 1k 10k 20k
FREQ(Hz)
MIC INPUTS Plug a microphone source into the XLR input. If you
leave the jack input unplugged then the PAD (LINE) switch becomes a
30dB pad for the microphone. This lets you use the XLR input for high
output microphones, or for line level sources.
LINE INPUTS Plug a line level source into either the XLR or the TRS
jack input. If you use the XLR input make sure that you do not plug
anything into the jack input, and that you press the PAD (LINE) switch.
If you use the TRS jack input make sure that you press the PAD (LINE)
switch. The jack input is only selected with this switch pressed.