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thumb|300px|right This process is done to reduce unwanted noise from external sources that interfere with the cable. As unwanted noise is picked up along the cable, the positive and negative wires will pick separate identical versions of the unwanted noise. When the signal is the re-inverted both the unwanted noise signals will be 180 degrees out of phase, therefor cancelling each other out.

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The black sin wave replecates the desired signal. The red line replicates the unwnated noise.

This process is done to reduce unwanted noise from external sources that interfer with the cable. As unwanted noise is picked up along the cable, the positive and negative wires will pick seprate identical versions of the unwanted noise. When the signal is the re-inverted both the unwanted noise signals will be 180 degrees out of phase, therefor canceling each other out.

thumb|300px|right|This clip explains the advantage of balanced audio signal.

Here are some usefull links:

http://www.mediacollege.com/audio/balanced/cable-balanced.html

http://en.wikipedia.org/wiki/Balanced_audio

http://www.arcam.co.uk/advice-and-support/technical-articles/balanced-audio.htm

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