Balanced audio does not reject noise. It picks the noise up twice and subtracts it from itself — the actual mechanism, why it lets a cable run a hundred metres, and what CMRR is measuring.
"Use a balanced cable, it rejects noise" is the standard explanation and it is not true in a way that matters. Balanced connections do not reject anything. They pick the interference up twice and subtract it from itself, and once you understand that sentence you can predict every situation in which the technique works and every way it can be defeated.
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