![]() It's as is the noise never existed That is the advantage of differential amplifiers.they are really adept at cancelling external noise injected on their inputs (plus also cancelling out odd harmonic distortion products but that's another story, no worries). The external noise now is completely rejected and we now have a clean signal 2S. ![]() The same operation described above takes place, i.e (S+N) and (-S+N) are received and are subtracted by the processor/amplifier circuitry as explained above. Now, when external noise N hits both signal lines its referred as common mode noise. When received by an audio processor/amplifier, the 2 signals are subtracted from each other S - (-S) to produce a combined signal twice the amplitude or 2S. ![]() A differential signal consists a signal S and its inversion -S. ![]() but you don't need any special speakers when using a differential audio device. ![]()
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