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Balanced and Unbalanced Audio Lines 

A description of the pins in certain audio cables (RCA, 1/4" 2 conductor, etc) and their funtions

XLR

Pin

Function

1

Chassis ground (cable shield)

2

positive polarity terminal ("hot")

3

return terminal[2] ("cold")

Also known as “Cannon Connector” to reflect inventor’s name.

Comes in 3, 4, 5 pin and mini 3 M/F pin configurations.

Most common professional microphone and audio connector.

Some equipment reverses pin 2 (- cold) and pin 3 (+ hot).

 

Unbalanced Audio: RCA, ¼” 2 conductor, 3.5/2.5 mm 2 conductor.

Traditional unbalanced cables use two lines to transmit the audio signal - a hot line which carries the signal and shield line. This is all that is required to transmit audio and is common in short cables (where noise is less of a problem) and semi-professional applications.

Unbalanced


Initial Publish Date: April 7th, 2025

Transcribed by: Tyler Rowe, Customer Service