DIY Insulated Speaker Cable

Discussion in 'Archived Threads 2001-2004' started by Jordan Tracey, Nov 25, 2001.

  1. Jordan Tracey

    Jordan Tracey Stunt Coordinator

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    Ok! Where can I get insulation for speaker cable, and like shielding that will keep out interferance....
     
  2. Brett DiMichele

    Brett DiMichele Producer

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    For Dialetic Sheilding the best material to use is pure
    Dupont PTFE (Teflon) which you can buy in various diameter
    tubing sizes from
    http://www.newageind.com/plastics/tefchemf.htm
    As for EMI insulation the best material to use is a metallic
    outer braiding. You can buy Stainless Steel braided fuel
    line for race cars and that braiding can be grounded somehow
    to sheild from EMI or you can just use Coax cable to make
    speaker cables. I wouldn't use Coax for speaker cable but
    some have and some still do and they say it works..
     
  3. Jordan Tracey

    Jordan Tracey Stunt Coordinator

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    Thanks for the help man!
     
  4. Jordan Tracey

    Jordan Tracey Stunt Coordinator

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    Though, how would you ground the outside metal tube?
     
  5. Jordan Tracey

    Jordan Tracey Stunt Coordinator

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    Thanks again man. Well, I was hoping I wouldn't have to as the stainless steel tubing for fuel line is really expensive stuff.
     
  6. Tim Kilbride

    Tim Kilbride Stunt Coordinator

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    Jordan,

    NEVER ground the shield to your neg output...you should connect it to the chassis of at least one of the units you are interconnecting. Any EMI/RF will then (theoretically) collect on the shield, then to the chassis, and then to earth, given your source 120VAC outlet is properly grounded.

    Thanks,

    Tim
     
  7. Wayne A. Pflughaupt

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    It’s been a while since I checked, but isn’t there continuity between the speaker negatives and the chassis?

    And Jordan, I have to ask, why do you want to shield speaker cable? It really isn’t necessary.

    Regards,

    Wayne A. Pflughaupt
     
  8. Brett DiMichele

    Brett DiMichele Producer

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    Tim and Wayne,
    Thanks for the clarification. Thats why I said I was NOT
    sure about where the EMI sheilding get's it's ground at.
    I was fairly certain that it has to go to the chasis ground
    of the amp/receiver or however your supplying power to the
    speakers. I haven't made any interconnects, only non EMI
    sheilded speaker cables and I am still reading and learning
    every chance I get.
    I also have a question. On sheilded interconnects, where
    exactly would the EMI sheilding get grounded? From what I
    have seen it looks as if the sheilding gets grounded to the
    outer barrel of the RCA termination. Would this not be the
    same as grounding the EMI braid to a negative speaker post?
    Doesn't the outer barrel of the RCA act as the ground? And
    is it not isolated from the chasis via an insulator? Ok make
    that a bunch of questions rather than one [​IMG]
    I don't want to see anyone do any harm to thier equipment
    and I also want to learn the best way to do EMI Sheilding
    for future refrence. I also read a thread over in the HTF
    Hardware section where someone said the EMI braid is only
    terminated to a ground on one side of the cable (I assume
    the same would apply to a speaker cable) if this is the case
    then how can EMI sheilding even work? There is no continuity
    when one end is left unterminated.
    Thanks for the info in advance.
     
  9. Hank Frankenberg

    Hank Frankenberg Cinematographer

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    Shielding should be connected to ground on the "origin" equipment, and not connected to ground on the "destination" equipment. That would be for a true shielded cable. Note that most interconnects use a coaxial cable construction and that the inner conductor is the signal conductor and the shield is the ground and must be connected to both components. A true shield construction would be two inner conductors for the signal/ground and then an outer, separate shield braid that would be connected to the source component. Am I confusing?
     

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