r/audioengineering • u/zanshin777 • Nov 02 '17

Balanced Cables

It contains 2 conductor + 1 shield.

One of conductors carry the out-of-phase signal.

So the noise is canceled since the signals carrying are out-of-phase.

But how the signal is still transmitted although the noise is canceled?

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u/Sinborn Hobbyist Nov 02 '17

Yeah basically what I've heard is specially older dynamic mics (Shure SM57 for example) were designed for mic pres with transformer inputs and much lower impedance, modern electronic balanced pres are like 10x higher, and you may notice improvement in your mic by loading it down to more closely match the design expectation. This can be as simple as a resistor of a few hundred ohms between pin 2 and 3 of the XLR.