Nexo NXAMP4X1, User Manual

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SETTING-UP ADVICE
TDcontroller can sustain high current in pin 1 without degradation of output noise. We
recommend that the sources and loads you use have the same desirable characteristics.
It is sometimes claimed that connecting cable shield at both ends creates ground loops,
and that the current flowing in such loops will produce noise. This is not the case for most
professional audio equipment. In short, there are two kinds of loops in which voltages are
present: the loops formed by signal wires, and the loops formed by grounded conductors,
among which are protective earth conductors (PE) and signal cable shields.
When a cable shield is grounded at both ends, a loop is closed, and the resulting current
causes a reduction of the voltage induced on signal lines. This effect is what the cable
shield is intended to produce, since this is how it protects your signal from magnetic fields.
If you are using an asymmetrical (unbalanced) source (not recommended), it is best to use
a shielded twisted pair and to connect wire 3 of the cable to the shield at the source output
end (see figure bellow).
This technique prevents noise currents flowing on the return path of the signal. (Note that
this is only acceptable for a short cable).
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