"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?
What does it mean, "balanced?"
I'm new to theory of audio. Can anyone tell me what it means to be "balanced?" Someone told me it meant "zero feedback," which baffles me even more. Then what is "zero feedback?" The last question is about 220 V. I read that European 220 V is balanced. How does it affect stereo system compared to 110V in US? Thanks a lot in advance.