I and fellow engineer friends like taking the audio output from an analog comm unit and turn it into a 3-pin XLR cable to input into say a monitor desk so when we are monitor engineering, we can always have the comm sent to our cue unit for instance.
Every time we go to make one though…can never remember what pins on the 4-pin connector are what! Here’s the diagram for our own sake and yours if you wish to follow the same technique. Take pins 3 and 4 to pins 2 and 3 on a standard XLR and you have the audio.
