Comment on In a blind test, audiophiles couldn't tell the difference between audio signals sent through copper wire, a banana, or wet mud

JcbAzPx@lemmy.world ⁨1⁩ ⁨day⁩ ago

• NotMyOldRedditName@lemmy.world ⁨1⁩ ⁨day⁩ ago

  Something in my computer monitor isn’t shielded and will alert me to a incoming cell phone call a second or two before the phone rings.

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  • filcuk@lemmy.zip ⁨1⁩ ⁨day⁩ ago

    Your monitor is like the blinking stickers we used to put on our phones.
    Yes my knees creak, why do you ask

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  • 0x0@lemmy.zip ⁨1⁩ ⁨day⁩ ago

    My old speakers used to do that.

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• tias@discuss.tchncs.de ⁨1⁩ ⁨day⁩ ago

  Are you implying that gold isolates better from interference than copper?

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  • drev@lemmy.dbzer0.com ⁨1⁩ ⁨day⁩ ago

    He’s talking about the electromagnetic shielding in a cable, not the contact-points. Usually a copper mesh sheath housed underneath the outer-most rubbery layer and runs around and along the entire length of the signal-carrying wires inside the cable. Works like a Faraday cage, helps prevent electromagnetic interference from large power sources, other unshielded cables running parallel, or anything else that can generate an electromagnetic field near the cable.

    Very important to protect signal integrity, widely used even outside the audiophile world (although there are of course plenty of audiophile gimmicks related to shielding).

    Basically, if you have a bunch of live unshielded cables bundled and zip-tied together along with your speaker wire, you’ll definitely hear it. Run the signal through an oscilloscope, and you’ll even see it

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    • GalacticGrapefruit@lemmy.world ⁨1⁩ ⁨day⁩ ago

      Seems like you know what you’re talking about. If I may ask, how do ferrite beads figure into this? Do those actually help protect signal, or is it less effective?

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      • drev@lemmy.dbzer0.com ⁨23⁩ ⁨hours⁩ ago

        Simply put, both protect against certain types of interference in different ways, and each are effective in ways that the other is not.

        Mesh shielding is going to help prevent electrical interference from being introduced via the wire itself from an external source. Like other cables carrying signal and running very near/parallel, or electromagnetic fields generated from other devices, certain electrical components, household appliances, etc.

        The ferrite beads protect against radio-frequency interference (RFI) via induction, acting like low-pass filters which attenuate specific bandwidths of very high frequency signals. Essentially, they intercept and absorb high-frequency electrical noise, and convert that energy into a small amount of heat instead of letting it pass through further down the signal path. This kind of interference can be from an external source, or generated internally from the various electronics/components in the signal path (which mesh shielding would do nothing to protect against). They also help dissipate any RFI that the mesh shielding itself may be carrying, so you often see both ferrite beads and mesh/foil shielding, like on laptop chargers or USB cables for example.

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    • tias@discuss.tchncs.de ⁨1⁩ ⁨day⁩ ago

      But the article is about what material is used as a conductor

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      • drev@lemmy.dbzer0.com ⁨1⁩ ⁨day⁩ ago

        Yeah, but the comment you replied to was making a point that the conductor doesn’t really matter if there isn’t any noise present. What makes a good cable has much more to do with proper shielding, because electromagnetic interference is what will muck up your signal, not a lack of gold plated connectors

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      • Couldbealeotard@lemmy.world ⁨1⁩ ⁨day⁩ ago

        The benefit of gold is that it doesn’t corrode

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  • Noel_Skum@sh.itjust.works ⁨1⁩ ⁨day⁩ ago

    As I understand it gold is used as it doesn’t tarnish or corrode - it’s not there to benefit the sound in any way.

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    • BCsven@lemmy.ca ⁨1⁩ ⁨day⁩ ago

      Exactly, silver is a better conductor I believe, but tarnishes like copper does

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