SoundCraft GB4 - Manual (Page 29)

29 GB4 User Guide
Rear Connectors
MIC INPUT LEFT and RIGHT (3 pin female XLR)
Pin 1 Ground
Pin 2 Signal Hot
Pin 3 Signal Cold
LINE INPUT LEFT and RIGHT (1/4" TRS Jacks)
Tip Signal Hot
Ring Signal Cold
Sleeve Ground
MIC L
MIC R
L
R
LINE
STE1