XLR connectors are available in male and female versions in both cable and chassis mounting designs, from 3 pin to 7 pin versions.
3 Pin – The most common of the XLR connectors used mainly for Balanced Audio signals, Three-pin XLR connectors are used to interconnect powered speakers with line-level signals. This use is commonly seen in PA system applications and seems to be growing more common.
4 Pin – They are the standard connector for intercom headsets, Another common use is for DC power connections for professional film and video cameras and related equipment.
5 Pin – XLR connectors are the standard for DMX512 digital lighting control, Other common uses are for dual-element or stereo microphones (two balanced audio signals with a common ground)
6 Pin – XLR connectors are used for dual channel intercom systems, and stage lighting control applications
7 Pin – XLR connectors are used to connect some valve (tube) condenser microphones to their power supplies (carrying signal, polarisation voltage, heater and HT). Used by several models of Le Maitre and Ultratec fog machines for remote control.
