Electronics > Beginners
Cable shielding audiophool or facts?
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FriedMule:
So my reply to him is that it is BULL and even a heap of it:-)
bson:

--- Quote from: FriedMule on November 13, 2018, 05:22:02 pm ---So my reply to him is that it is BULL and even a heap of it:-)

--- End quote ---
:-+
AndyC_772:

--- Quote from: FriedMule on November 12, 2018, 05:25:13 pm ---CatalinaWOW and AndyC_772, the "magic" in this cable should be that on top of being a doble shielded cable, it would block nearly everything because the capacitor-effect should store the interference and when charged, block the non-DC interference like a capacitor blocks as AC.

--- End quote ---

Sorry, maybe it's a language thing, but this explanation just doesn't make sense.

Yes, the two shields together form a capacitor, in which both plates are connected to ground. Why is that a good thing? How and why does the presence of that structure have any effect on interference?


--- Quote from: FriedMule on November 13, 2018, 05:22:02 pm ---So my reply to him is that it is BULL and even a heap of it:-)

--- End quote ---

I think your reply should be in the form of a challenge. Explain why, using sound scientific principles, this cable should work better than simple co-ax.

Ignore anything vague or woolly. Insist on an explanation which refers to the well-understood principles of electromagnetic wave propagation.
xavier60:
It is important for shielded connecting cables to have very low shield conductor resistance.
Any voltage drop that develops between the ends of the shield due to interference current  becomes input noise signal.
Even with double insulated AV components, there is always some capacitative interference current flow from mains to chassis.
GrahamC:
What is described in the original post is called a Faraday shield, or more correctly in this case a cable with two Faraday shields where each in turn is connected to the chassis of the two connected pieces of equipment, one at each end of the cable and the two Faraday cages themselves are not connected to each other.

Faraday shields can be very effective at reducing EMI/RFI and ground loops but I have only used and seen where there is only one such shield on any given cable.

An interesting idea to use two. One can be quite effective but two may be a case of diminishing returns where the effort and cost of the second vs effectiveness  is not worth the time and effort.

cheers,

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