XLR Wiring Standards, Diagram & Pin-out (3 Pin Audio & 5 3 Pin XLR Wiring Standard 3 Pin XLR connectors are standard amongst line level and mic level audio applications. The above diagram shows you the pin numbering for both Male and Female XLR connectors, from the front and the rear view. "3 Pin XLR Wiring Diagram, Cable Wiring, Etc." "3 Pin XLR Wiring Diagram, Cable Wiring, Etc." Cable designed for being cut into standard mic cables may have 2 pairs of wire and a shield around the outside, in that case pair the colors together and make sure they go to the same pin number on each end.