[kwlug-disc] Multi-zone question for the audio gurus
jvj at golden.net
Wed Apr 13 14:34:25 EDT 2011
On 2011-04-13 13:59, Chris Irwin wrote:
> Is common ground for two RCA cables important? I assumed that would be
> default via the equipment at either end.
This gets messy here. It is generally good practice to ground shielded
cables at only one end. For multiple cables, the cables should be
grounded at the same point or at the same piece of equipment. And the
shield should not be part of the signal circuit.
In your application there should be a twisted pair for the signal path
inside the shield. The problem, however, is that RCA jacks, plug and
cables do not conform to this "recommendation". The RCA jack/plug combo
was designed for interconnecting co-located equipment not equipment in
The phone jack/plug does conform to the "recommendation". The phone
jack/plug has two conductors, the "tip" and the "ring". (Recall John Van
O's presentation not long ago.) As well as the tip and ring conductors
there is the "sleeve" or "barrel" which used for the ground conductor.
Did someone say "frankenwiring'?
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