History and Manufacturers
The XLR connector was invented by James H. Cannon, founder of Cannon Electric in Los Angeles, California (now part of ITT Corporation), and for this reason it was sometimes colloquially known as a Cannon plug or Cannon connector and in Japan as Cannon jack, though this term has since fallen out of common usage in the industry. Originally manufactured as the Cannon X series, subsequent versions added a latch (Cannon XL) and then surrounded the female contacts with a resilient polychloroprene, which resulted in the part number prefix XLR. There was also an XLP series which used a hard plastic insulation, but was otherwise the same. ITT Cannon originally manufactured XLR connectors in two locations Kanagawa, Japan and Melbourne, Australia. The Australian operation was sold to Alcatel Components in 1992 and then acquired by Amphenol in 1998. ITT Cannon continue to manufacture XLR connectors in Japan.
The Switchcraft corporation later started manufacturing compatible connectors, followed by Neutrik. Neutrik made a number of improvements to the connector and their second-generation design (known as the X-series) had just four parts for the cable connector and eliminated the small screws used by both Cannon and Switchcraft, which were prone to working loose, falling out, and becoming lost. These improvements made Neutrik the most popular brand of XLR connector.
Unbranded XLRs are also made by far-east manufacturers. Originally these were copies of the Cannon or Switchcraft designs, but in recent years the Neutrik designs have also been copied.
Read more about this topic: XLR Connector
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