A plug and socket used in professional audio equipment, lighting controls (see DMX512) and other applications. It uses a balanced connection and locks into the socket. XLR connectors are twice the size of the standard RCA plugs and sockets found on consumer equipment. See analog stereo. Hot Plugging The ground channel on the socket is designed to make contact with the ground pin on the plug before the other pins make contact. This avoids external signals and momentary distortion when cables are plugged in and out in a live session. The XLR name comes from a particular X connector from Cannon, which was modified with a latch (the L) and a rubber compound (the R). See A/V ports and plugs and sockets.