Electronics > Beginners

Cable shielding audiophool or facts?

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Zero999:
Shielding can help guard against interference. It's normally used on very low level signals connected to the input, such as microphones, but can be used on the outputs too, as RF can get in there as well. Even signals outside the audio band can cause problems, as they can be demodulated by non-linear junctions inside the amplifier and produce audible noise.

The shielding doesn't have to be connected to earth to be effective. It just needs to be connected to the amplifier's chassis.

If you aren't experiencing any problems with noise or mains hum, then it should be left as it is and there's no need for additional shielding. If you are having problems with noise and hum, then start off with the signal inputs first. Before thinking about shielding, investigate whether it's caused by a ground loop. What external devices is the amplifier connected to? Are any of them also mains powered? Do you have anything connected to the amplifier, which is powered from the same DC power supply?

FriedMule:
Hero999 Yes I have heard that a single shield can help with noise, but this "magic" cable postulates that a shield connected to source plus a outer shield connected to the amp, with a thin rubber insulator between, do miracles to the noise suppression because these two layers acts as a capacitor.

Richard Crowley:

--- Quote from: FriedMule on November 13, 2018, 04:49:45 am ---Sorry for my bad wording, what I mend was: "I think that audiocable goes to ground via the outside shield that also are used as the negative wire and often connected to the case?"

--- End quote ---

Sorry, that in no way explains how the ground return gets connected between the source and the destination. No amound of verbal description will get around this fundamental flaw in the logic.  Draw a circuit diagram and prove it for yourself.  This is 100% certified audiophool baloney.  :bullshit: :bullshit:

FriedMule:
Richard Crowley lol love your comment and drawing:-)
As I see it, the only ground that both the source and amp has, is the ground via the power cable.
But the "magic" in this should be that one "leg" goes to one case and the other "leg" goes to the amp, as in a capacitor and thereby blocks noise like in a filter. :-)

Richard Crowley:
Using the mains power protective earth (green wire) as the return path for your unbalanced audio signal is the very definition of a ground loop. This entire scheme is first class audiophool fantasy.  The co-axial shields DO NOT form any kind of "filter"  they only provide an open circuit for the audio signal. 

Construct a cable for yourself and try it.  Get back to us after you have actually tried a real example.  Otherwise, I am done with this absurd discussion.

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