The input channels, Pad (line), Gain – Allen&Heath MixWizard3 12M User Manual
Page 14: User guide
14
WZ
3
12M
User Guide
The Input Channels
+48V
Switches +48VDC to the channel input XLR for powering
microphones or DI boxes that need phantom power. The power is
current limited through 6k8 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.
PAD (LINE)
Press to switch in a 20dB attenuator pad between the
channel XLR input and the preamp. Use with line level or hot
microphone signals.
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 (mic), or -10 to +40dB (line, pad
selected). The gain should be set using PFL so that the console
meters average ‘0’ with loudest moments lighting ‘+6’. Reduce gain if
the red peak indicator lights.
HPF
Switches in the channel high pass filter. This attenuates
frequencies below 80Hz by 12dB per octave. The filter is pre-insert,
pre-EQ. Select the HPF to reduce low frequency noise such as
microphone popping, stage noise and tape transport rumble.
EQ
A 4-band semi parametric EQ provides independent control of
four frequency bands. HF and LF are shelving filters which affect high
frequencies above 12kHz, and low frequencies below 80Hz
respectively. HM and LM are bell shaped peak/dip filters which affect
frequencies around a centre point which can be swept from 500Hz to
15kHz and 35Hz to 1kHz respectively. These have a width (Q) of 1.8.
All bands can be boosted or cut by up to 15dB and have a centre
detent 0dB position.
Check for the best microphone selection and placement before using
the EQ. Start with the EQ set flat and apply only as much boost or cut
as is really needed. When dealing with problem frequencies cut rather
than boost where possible.
+20
+15
+10
+5
0dB
-5
-10
-15
-20
20
50
100 200
500 1k
2k
5k
10k
20k
10k
5k
2k
1k
500
200
100
50
20
10
-40
-35
-30
-25
-20
-15
-10
-5
0dB
+5
20k
10k
5k
2k
1k
500
200
100
50
20
-20
-15
-10
-5
0dB
+5
+10
+15
+20
+20
+15
+10
+5
0dB
-5
-10
-15
-20
20
50
100 200
500 1k
2k
5k
10k
20k
PK!
MUTE
PFL
SIG
PAD
+48V
HPF
HF
+15
4k
15k
6k
1k
-15
500Hz
700
HM
3k
(LINE)
+15
250
1k
400
-15
70
35Hz
LM
45
180
+15
+15
-15
LF
-15
CH TRIM
O
O
+6
O
O
+6
O
O
+6
O
O
+6
O
O
+6
O
O
+6
O
O
+6
O
O
+6
O
O
+6
O
O
+6
O
O
+6
O
O
+6
O
O
+6
POST
PRE
EQ IN
MIX
PAN
MIX
6
5
ST
C
MIX
PAN
MIX
2
1
ST
C
MIX
PAN
MIX
4
3
ST
C
MIX
PAN
MIX
8
7
ST
MIX
PAN
MIX
10
9
ST
MIX
PAN
MIX
12
11
ST
10
- 10
GAIN
20
0
40
60
50
40
30
H
L
M
M
M
M
M
M
M
M
M
M
M
M
G
C
C
C
L
R
L
R
L
R
L
R
L
R
L
R