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RFI : how does it affect mains circuitry of hifi equipment?

Discussion in 'audio' started by Ragaman, Feb 20, 2015.

  1. tonerei

    tonerei pfm Member

    Why bother I don't think there are many here making claims about £1800+ cables and generally anybody who would buy products at that level wouldn't be bothered posting on this forum and a lot of others about their experience.

    From what i can ascertain here most people including myself simply don't have that spare money to spend on mains cables regardless of whether they can yield a massive improvement or not.
     
  2. Mike Reed

    Mike Reed pfm Member

    Now that's a new one on me. I'm not refuting it because I simply have no idea but it does, on the face of it, seem very unlikely. What can cause these interference and hum problems when we're talking about mains power in, transformed into DC (?) within the box. Then,, via a process of electronic circuitry and componentry, allows the amplification or processing of a musical signal. This then transports this line level signal via interconnects.

    I can see only one common factor, and that is earthing; how is this affected by varying lengths? Puzzling.:(
     
  3. tonerei

    tonerei pfm Member


    I think earthing is a science in itself. Star grounds, spike, dedicated radial and the extreme that arkless would warm to:) Entreq tellus
     
  4. Ragaman

    Ragaman Mentalist

    That is the point here, every time someone even suggests they have experienced an improvement with a mains cable it instantly get's labelled as an exotic £2000 cable by the usual suspect, it is also claimed that anyone using such a product hears huge life changing improvements, again, not the case, everyone knows this is a ridiculous price for a cable of any kind, who on earth would buy such a thing, there is a huge difference from this to paying out £10 for one if you want to.
     
  5. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    Normal common or garden everyday interference/hum from having mains leads and signal leads all spaghettied up together (plus earth loops) is what he's talking about...
     
  6. Purité Audio

    Purité Audio Trade: Purite Audio

    Grounding boxes are the real deal, sealed boxes of 'minerals' attached to a spare input on your preamp, how could they not possibly bring a huge improvement.
    Keith.
     
  7. Ragaman

    Ragaman Mentalist

    Can you explain further how doing this improves things, firstly, what does it improve & how & why does it improve sound quality.
     
  8. Darth Vader

    Darth Vader From the Dark Side

    Thats because of lack of knowledge. RFI is a very complex issue and even audio designers often fail to understand the complexities. This tutorial is aimed at radio amateurs but covers a lot of ground and is an excellent primer.

    http://audiosystemsgroup.com/RFI-Ham.pdf

    Here is a very good high-level presentation. Its US centric but it applies to the UK also. http://www.bennettprescott.com/downloads/grounding_tutorial.pdf

    You can find out a lot more by searching RSGB or just seardh on topics that interest you.

    Cheers,

    DV
     
  9. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    I'm talking about any and all mains cables not specifically very expensive ones... although they do take the piss! I'm saying that any and all mains cables sound the same irrespective of cost as it's not possible for a mains cable to have any influence on sound quality. Just to be clear :)
    Food tastes the same whether you eat it using the cheapest cutlery or gold cutlery as the cutlery itself obviously has no flavour would be another analogy!
     
  10. Purité Audio

    Purité Audio Trade: Purite Audio

    They are just fantastic, the boxes are sealed to protect the extremely advanced proprietary technology within, some of the more expensive one,s $50k plus have really nice polished cabinets.
    They are not connected to the mains ,just plug into a spare input on your preamp, compared to mains cables they offer a quantum leap in SQ.
    Keith.
     
  11. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    From a quick glance that is a very thorough article on the subject!

    All those talking tosh should read it!
     
  12. Blzebub

    Blzebub Banned

    This has been my experience - no difference. In my youth, I tried out some aftermarket mains cables. Not that I've tried them all, but life is short.
     
  13. Harry1212

    Harry1212 pfm Member

    Mu - Metal, pal . . .

    ;)
     
  14. stevec67

    stevec67 pfm Member

    Um, that would actually be a poor analogy. Cutlery does have a flavour, we choose stainless because it has little flavour and it's cheap and durable. A suck on a 2p piece will soon establish that not all metals have no flavour!

    Incidentally, has anyone else noticed that the new 10p's are made of steel and picked up by magnets? Bloody cheapskates. It's been the case for 1p's and 2p's for a while. I know this because for whatever reason my new housekeys are magnetic and they pick change out of my pocket and shower it everywhere.

    [/food science nerdery]
     
  15. sbgk

    sbgk pfm Member

    I think the stance that ferrites can filter rfi from a cable but insulation on a cable can't act as a filter is inconsistent. Any cable companies that want to sponsor me to be a shill, please get in touch.
     
  16. Blzebub

    Blzebub Banned

    [​IMG]
     
  17. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

    I mentioned it several pages back.... Bloody expensive though!

    It's for shielding against the magnetic aspect of EMI ;)
     
  18. Darth Vader

    Darth Vader From the Dark Side

    Too true. The latest research puts gold at the top for taste.

    http://www.ft.com/cms/s/2/776ba1d4-93ee-11e1-baf0-00144feab49a.html

    Cheers,

    DV
     
  19. whatsnext

    whatsnext Naimless

    How much Ferrite insulation have you encountered?
     
  20. Arkless Electronics

    Arkless Electronics Trade: Amp design and repairs.

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