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BALANCED VERSUS UNBALANCED
If you become an audio engineer, sooner or later you will recognize differences between balanced and unbalanced audio equipment. A balanced line offers excellent immunity from hum, noise pickup, interference, and ground loops. Most professional recording studios use all balanced equipment. An XLR or a quarter-inch T/R/S (tip/ring/sleeve) connector usually indicates a balanced input or output (see Figures in Appendix B). A balanced line is used with microphones and high-quality line signals.
The Technical Part Is as Follows
Balanced lines typically have THREE wires used for a single signal. Pin 1 is usually ground, ...
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