"Eeyore" wrote in message
...


Serge Auckland wrote:

The only part of domestic equipment that would benefit from balanced
connection IS the phono cartridge, so that at least should be connected
with
XLRs. For everything else, crappy phonos is OK, if you don't have to
change
connections frequently.

That shows a STAGGERING lack of knowledge of the realities of audio and
the
environment in which it operates.

Notably with modern equipment it is totally untrue of those using
switch-mode
PSUs which invariably inject leakage currents at mains frequencies and
harmonics
into audio connections ( regardless of whether the unit is Class I -
earthed )
or Class II - double insulated ). i.e. 2 or 3 pole mains connector.

Even an unbalanced wire badly routed WILL pick up hum where the balanced
one
won't ( to the linit of the common-mode rejection ration of the
equipment ). I
came across an extraordinary example of this last year where a system
upgrade
had been installed by an idiot.

I would elaborate now but you could do worse than go to Jensen
Transformer's
site and download Bill Whitlock's paper on the use of balanced
connections.

Graham


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Maybe I have lead a sheltered life since I moved to the country.... :-) My
experience is otherwise, that decent equipment doesn't hum or pick up RF if
half-decent screened cable is used. I do accept that I've had some trouble
with SOME switched-mode powered equipment which was cured by the use of an
isolating transformer. I assumed that was an isolated example.

S.



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