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Commonly confused · Collaboration, Voice & AV

Balanced vs Unbalanced Audio: What's the Difference?

Balanced audio uses two signal conductors carrying the same signal with opposite polarity plus a shield, so the receiving input cancels noise picked up along the cable. Unbalanced audio uses a single signal conductor and the shield as the return, so it picks up more noise and suits only short runs.

Balanced Audio

Full definition
vs

Unbalanced Audio

Full definition
Balanced AudioUnbalanced Audio
ConductorsTwo signal (hot and cold) plus shield/groundOne signal plus shield/ground
Noise rejectionHigh, via common-mode rejectionLow
Practical cable lengthLong runs, often 100 m or moreShort runs, a few meters
Typical connectorsXLR, TRS 1/4 inch, Phoenix/EuroblockRCA, TS 1/4 inch, 3.5 mm consumer jacks
Typical levelProfessional line or mic levelConsumer line or instrument level
Typical useMicrophones, installed AV, pro audioConsumer gear, guitars, short patch connections
Remember it

Balanced cables cancel the noise; unbalanced cables carry it along.

Exam tip

AV exams ask which connector is balanced (XLR, TRS) and why balanced lines suit long runs. Remember a TRS connector can also carry unbalanced stereo, so context matters.

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