Electronics > Beginners

Cable shielding audiophool or facts?

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FriedMule:
Thanks for all your great answers:-)
To reply on some of your questions:

RandallMcRee "Why I do not look at google or messeure it by my self?" I have looked at google and got everything between "the solution to life" to "idiotic" and I have not yet a lab myself, on top of that I do not own that type of cable. So therefor I'd rather ask someplace that I trust (here).

Shock yes it looks a lot like it, except that the cable that I ask about was two core in the center and there is rubber heat shrink instead of the aluminium-foil.

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.

MosherIV this is the beginner part of this forum, so facepalm-questions can happen.

Towger I think that the reason for many things audiophools do, is because they are audiophools:-)

bson I think that audiocable goes to ground via the outside negative wire that are often connected to the case?

GregDunn:

--- Quote from: Towger on November 12, 2018, 09:21:33 am ---Sounds like fairly standard double screened coax.

What I never understood is why audio fools insist on using 'magic' phono cables etc.  While 'Pro Audio' just uses balanced cables with 3 pin XLR.  Which cost less, are more robust, don't pickup much RFI etc.  Why spent all that money when pro equipment is in most cases cheaper.

--- End quote ---

Usually because pro equipment is designed to run at much higher signal levels than home/consumer gear, and your S/N will suffer when operated at consumer levels.  You would need to redesign all gain stages from the low level to the power amplifier in order to reap any benefit from balanced signals.  Using adapters between unbalanced and balanced segments of the audio path will either make no difference or possibly make it worse, depending on the equipment involved.  Also, I'm not sure if there are any consumer phono preamps with balanced I/O which cost less than pro gear - or whether they'd even matter.  Nearly all phono cartridges have a common ground so you're starting out with an unbalanced signal already.

BrianHG:

--- Quote from: AndyC_772 on November 12, 2018, 08:02:16 am ---RF being picked up on an audio cable can easily be demodulated and turn into an audible signal, there's nothing facepalm-worthy about that.

--- End quote ---

I once had a bad example of this where a poorly shielded setup would receive and demodulate a local AM radio station which had a super-strong broadcast tower a few blocks away.

As for balanced audio, yes, if all your hardware, source, pre-amp, amp is balanced and you want the extra SNR it can offer especially over long cabling, it is useful.  However, with just reasonable quality shielded cables, normal RCA should exceed what you are able to hear unless your AV equipment is crap, or you have a really severe ground loop to AC mains issue where mains signal with some received higher frequency noise is injected into your sound due to the nature and positioning of your household wiring just by overwhelming force.

Richard Crowley:

--- Quote from: FriedMule on November 12, 2018, 05:25:13 pm --- I think that audiocable goes to ground via the outside negative wire that are often connected to the case?
--- End quote ---

What does that mean?
What is "outside negative wire"?
Does this audiophool have some sort of after-market bonding strap to all the chassis of his audio gear?
Surely you don't mean the green-wire safety-ground in the mains power cable.

If your proposed un-balanced tri-axial cable has only the center conductor connected from end-to-end,
then there is no return path for the audio signal and the cable won't work.
If you are relying on some external path as the return for the unbalanced audio signal, that is probably WORSE than just using a bog-standard ordinary RCA cable.

It is extraordinarily rare for someone to come up with a new, novel alternative way to do something invented 100 years ago.

FriedMule:

--- Quote from: Richard Crowley on November 13, 2018, 12:45:11 am ---
--- Quote from: FriedMule on November 12, 2018, 05:25:13 pm --- I think that audiocable goes to ground via the outside negative wire that are often connected to the case?
--- End quote ---

What does that mean?
What is "outside negative wire"?

--- End quote ---

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?"

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