What is the Difference between a Balanced vs Unbalanced Audio Signal?

Date:2020/3/7 11:41:51 Hits:

The difference between balanced and unbalanced audio signals has to do with the design of the audio circuit. A balanced audio circuit, like the XLR inputs on a pro audio rack processor, has both positive (+) and negative (-) legs, which are isolated from the ground. These “balanced” legs deliver the same impedance characteristics to ground and the same audio signal level, but with exact opposite polarities. When the two legs are combined and flipped in polarity, the signal strength is enhanced, while any noise that is picked up is canceled. This is why balanced audio circuits offer excellent rejection of unwanted noise.

An unbalanced circuit, such as a standard guitar cable, holds one leg at ground potential, while the second leg is “hot.” Unbalanced line circuitry is less expensive, but is more susceptible to noise. For the cleanest signal, with less hum and buzz, a balanced line is always recommended, especially if you have a long cable run, since noise is easily introduced into long, unbalanced lines.

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