Lexicon XLR

The XLR connector is a robust connector for audio signals commonly used in professional audio engineering. It is generally used in connection with symmetrical signals. There are different variants of the plug with 3 to 7 poles, whereby the 3-pole variant is by far the most common.

See also:

• Thread in the Hifi Knowledge of the Hifi Forum: What is an XLR connector?
• Wikipedia article XLR.