"Balanced" audio means the signal is split into its positive half and negative half (which are exact opposites of each other). Next, the two halves are compared and anything found in common is assumed to be external noise of some kind and is rejected. When the two halves are rejoined, there is nothing left except the pure original signal. This has nothing to do with feedback (which I don't know enough about to explain, sorry). Any feedback jockeys out there?
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