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Definition: balun

(BALanced UNbalanced) An adapter that connects a balanced line to an unbalanced line such as from XLR to RCA. A balanced line is one in which both wires are electrically equal. In an unbalanced line, such as a coax, one line has different properties from the other. See XLR connector and RCA connector.

This balun might be used to wire RCA outputs on a preamp to XLR inputs on an amplifier. (Image courtesy of CableCreation, www.cablecreation.com)

Twisted Pair to BNC
This balun enables a balanced twisted pair of wires to plug into an unbalanced BNC jack. The screw connectors (right) connect the two wires. (Image courtesy of Black Box Corporation, www.blackbox.com.)