What Is An XLR Connector

Why are microphone cable connectors called "XLR"

XLR Connectors, the three pin connectors used on most microphone cables, was originally manufactured by Canon Electirc, a US based company founded by James H. Cannon, and was initially known as the "cannon connector".

The original series of connectors was known as the "Cannon X Series"

Subsequently Cannon added a latching mechanism (the "L" in XLR)

Finally, a rubber insulating material was added around the contacts, adding the "R" designation.

XLR-

Cannon X series connector with Latching Mechanism with Rubber insulator

The XLR type of connector can have more than 3 pins and is used for many audio and power applications.