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speaker cable impedance, how important is it?

Discussion in 'Home Cinema Speakers' started by Duster, Mar 30, 2004.

  1. Duster

    Duster
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    Hi,
    I have some speakers that say "max recommended cable impedance 0.1" and I also have some speaker cable that says "6.0 impedance".

    Would this be a problem, if I try and us both together?

    Thanks for any help.
     
  2. Ettepet

    Ettepet
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    Both quantities are about different properties. The 0.1 Ohm number is about signal loss when a (lengty) cable has too much resistence. The second cable seems to be meant for 6 ohm speakers, which I think is a bit of a doubtful characteristic (as impedance varies greatly over a frequency range, in a very speaker-dependant way).
     
  3. Duster

    Duster
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  4. The Hemulen

    The Hemulen
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    Are you sure the 6 isn't refering to the 6mm cross section area of the copper?
     
  5. jradley

    jradley
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    Hi Duster,

    Assuming the cable you have is the 6mm variant, for any reasonable length it will almost certainly have an impedance of less than 0.1 ohm (most 6mm speaker cable has an impedance of about 3 ohm per km which means a 10m run will be about 0.03 ohm)

    You should be fine.

    John
     
  6. Ettepet

    Ettepet
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    Yes, from the page you're refering to it looks like you misread this property. That must be quite a cable, with such a size! ;)
     
  7. Duster

    Duster
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    Hi Guys,

    Thanks of clearing this up for me, I must be going mad....:blush:
    Yes, now ive looked at the cable again, it must be 6mm .

    Thanks again for helping me get this right:thumbsup:
     
  8. ancientgeek

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    Impedance (as opposed to resistance) of the cable is only important when the cable is of the order of the wavelength of the varying signals. These travel close to the speed of light. So if your cable is shorter than 100 meters, and your frequency is less than 1Mhz, the impedance doesn't really matter.
     

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