** Co-ax works perfectly with microphones.
Every bit as good as shielded twisted pair cable.

Using physically realizable materials, the only signal carrying system
one can construct in a manner that will be the most immune to external
noise sources is a shielded balanced twisted pair system.

** Fraid that is dead wrong.


Coax is prone to adding noise to the signal, since the
shield has impedance, carries the signal, and therefore can add noise
to the signal as the shield carries noise.

** Only true where the source has a common ground path with the receiving
device and an earth loop is created by the shield.

For a floating source, like a microphone, co-axial cable works just as
well
as STP despite not being balanced.

This is not a very well known fact and derives from the inherent symmetry
of
co-axial cable which rejects external magnetic field induction in a
similar
way twisting a pair of wires does.

It's nice to see that Phil is disagreeing without being abusive.