2 Wire

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Categories: Acquisition, Audio

Analogue, and for that matter digital audio, is often carried over two copper wires twisted together called a balanced-pair. It’s possible to use this single balanced line, to transport carry audio in both directions, send and receive on the same line. In communications jargon this is called a “two-wire”.
A plain old-fashioned telephone line (POTS) to a house or flat operates over just two wires, allowing users to talk and listen over that two-wire circuit, probably along with ADSL broadband download and upload.
two wire can be converted to four wire operation by an audio hybrid.