SoundCraft B400 - Manual (Page 48)

4.20 B400 Functional Description
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XLR-type connectors are provided for the main audio connections to the module.
Pinouts are as follows:
IInnsseerrtt SSeenndd LL
Pin1 Chassis
Pin2 Hot
Pin3 Cold
IInnsseerrtt RReettuurrnn RR
Pin1 Chassis
Pin2 Hot
Pin3 Cold
IInnsseerrtt SSeenndd RR
Pin1 Chassis
Pin2 Hot
Pin3 Cold
IInnsseerrtt RReettuurrnn LL
Pin1 Chassis
Pin2 Hot
Pin3 Cold
SStteerreeoo OOuuttppuutt RR
Pin1 Chassis
Pin2 Hot
Pin3 Cold
SStteerreeoo OOuuttppuutt LL
Pin1 Chassis
Pin2 Hot
Pin3 Cold