Soundcraft GB4 User Manual Page 26
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26 GB4 User Guide
Mono Input
MIC GAIN (1) adjusts the sensitivity of both mic (XLR) and Line (1/4” jack) inputs. Both inputs
are electronically balanced, and are located on the rear connector panel.
The PEAK LED (2), monitors two points in the audio path: pre-insert point and post-EQ.
The 48V switch (3) applies 48V phantom power to the input XLR. An adjacent LED indicates
when the phantom power is on.
The PHASE switch (4) reverses the phase of the selected input.
HI-PASS (5) switches in the high-pass filter.
The module insert point is pre-EQ , pre-fader. It is located on the rear connector panel.
The EQ section (6) is four band, with shelving HF and LF, and swept peaking high and low mid
sections.
The HF and LF sections give +/-15dB cut/boost at 12kHz and 60Hz respectively. The Lo-mid
section gives +/-15dB cut/boost at 80Hz-1.9kHz. The Hi-mid section gives +/-15dB cut/boost at
550Hz-13kHz.
The section is switched in by the EQ switch (7).
Signal is sent to the AUX 1-8 busses via individual level pots (8). Aux 1- 4 are pre fader signals,
whilst Aux 5-8 are globally selectable pre or post fade via switches on the master section.
Signal for the L+R (main mix), 1-2 group busses and 3-4 group busses are routed via the PAN
pot (9). The pan pot positions the signal within the stereo image.
The signal in the module is turned on and off by the illuminated MUTE switch (10), and also the
master mutes M1-M4 from the master section, if they are selected using the M1 - M4 switches
(11).
Post-fader signal level is controlled by a 100mm fader (12).
The signal is sent to the stereo mix bus, centre bus and 4 group busses using the C, L+R, 1-2
and 3-4 switches (13). Note the use of group 1 & 2, and group 3 & 4 as 2 sets of stereo pairs.
A 4-segment LED bargraph meter (14), next to the fader, meters the signal post-EQ, pre-mute,
pre-fade. The meter has a peak type response.
The PFL switch (15) feeds the pre-mute, pre-fade signal to the monitor output and phones
output. An adjacent LED indicates when the PFL is on.
EQEQ
HI
MID
HF
LO
MID
LF
15
12
9
6
33
6
9
12
15
-
+
0
15
12
9
6
33
6
9
12
15
-
+
0
550
13k
3k
80 1.9k
450
15
12
9
6
33
6
9
12
15
-
+
0
15
12
9
6
33
6
9
12
15
-
+
0
60dB
30
5
100Hz
GAIN
MIC
48V
PK
LINE
-20
=
10
5
0
5
10
15
20
30
+16
+8
0
-10
M
1
M
2
M
3
M
4
C
1
2
L
R
3
4
PFL
6
0
+
6
0
+
6
0
+
6
0
+
6
0
+
6
0
+
6
0
+
6
0
+
AUX1
AUX2
AUX3
AUX4
AUX5
AUX6
AUX7
AUX8
PAN
PRE
PRE
PRE
PRE
POST
POST
POST
POST
PRE
PRE
PRE
PRE
R
L
0
MUTE
1
1
1
3
4
5
6
7
15
10
11
8
12
13
9
14
2
- 1GB4 User Guide 1
- 2 GB4 User Guide 2
- IMPORTANT 2
- ContentsContents 3
- Contents 3
- 4 GB4 User Guide 4
- 5GB4 User Guide 5
- Key Features 6
- Warranty 7
- 8 GB4 User Guide 8
- SAFETY SYMBOL GUIDE 9
- IMPORTANT SAFETY WARNINGS 10
- 11GB4 User Guide 11
- WARNINGS 11
- Mains Installation 12
- 13GB4 User Guide 13
- Initial Wiring Considerations 13
- Audio Wiring 13
- Shielding 13
- WORKING SAFELY WITH SOUND 14
- 15GB4 User Guide 15
- Initial set-up 15
- Troubleshooting 15
- 16 GB4 User Guide 16
- Audio Connector Pinouts 17
- Dimensions 18
- 19GB4 User Guide 19
- Mono Input 20
- Stereo Input 21
- Talkback and Stereo Returns 22
- Group/Aux/Matrix Outputs 23
- Master Section 24
- 25GB4 User Guide 25
- 27GB4 User Guide 27
- Rear Connectors 27
- 29GB4 User Guide 29
- 30 GB4 User Guide 30
- 32 GB4 User Guide 32
- L, R & C Outputs 32
- REC/ALT Outputs 32
- Monitoring & PFL 32
- Master Mutes 32
- Rear Connector Panel 33
- 34 GB4 User Guide 34
- 35GB4 User Guide 35
- 36 GB4 User Guide 36
- 37GB4 User Guide 37
- 38 GB4 User Guide 38
- 39GB4 User Guide 39
- 40 GB4 User Guide 40
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