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Cable length

Discussion in 'Cables & Switches' started by arn, Feb 18, 2005.

  1. arn

    arn
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    Hi

    Quick question, popping to richersounds on my way home from work to get some speaker cable. Do they all have to be equal length? 5.1 setup btw
     
  2. Londondecca

    Londondecca
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    The short answer is no unless you are running miles of cable.
     
  3. arn

    arn
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    Rear speakers will be about a 15 metre run and the front should only be about a 2 metre run. This won't affect timing or anything if i get the sizes cut to that length then?
     
  4. Zigster

    Zigster
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    The speed of light is approximately 300,000 km/s. Speaker cables transmit the signal at a pretty big percentage of that.

    If the signal could travel around the world several times in a second, you shouldn't notice the difference in the time it takes to go half way around your room! :D

    I think there was a big thread recently about speaker cable facts/myths. You should do a search on that.
     
  5. Peridot

    Peridot
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    Timing issues are dealt with through the receiver's setup. This relates to the distance between the speaker positions and your listening position (related to the speed of sound through air)

    The cable lengths will have no effect.

    _______________
    Dermot
     
  6. arn

    arn
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    Thanks people :thumbsup:

    Couldn't go on the way home mrs had to get straight home for a hen night, get them tomorrow instead now.
     
  7. Mango Bob

    Mango Bob
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    Dude, you have optical speaker wire? Where can I get some?
    :rotfl:
     
  8. eviljohn2

    eviljohn2
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    :laugh:

    Light travels in air at ~ 3*10^8 m/s
    Electrical signals travel in copper at ~3*10^7 m/s
    Sound travels travels in air at ~300 m/s

    For those that don't understand index form, light travels in air at ~300 million metres per second. Electrical signals travel at about 1/10 of that speed.

    In response to the original question, it doesn't matter if you have different lengths of speaker cable. Having a difference of a few tens of metres will be easily recreated by moving your head a couple of centimetres. :)
     
  9. Scaleyback

    Scaleyback
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    What??!! You mean I have to keep moving my head from side to side to hear the best effects? Jeez, this is getting complicated!
     
  10. Peridot

    Peridot
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    Yep - Just observe the front few rows of the audience at a Motorhead gig for an example of the best technique :thumbsup:

    ______________
    Dermot
     
  11. Londondecca

    Londondecca
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    But if you move your head at near the speed of light (or darkness), the effect is cancelled and the length of the cable would then be relevant.
     
  12. CJROSS

    CJROSS
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    Velocity of propogation chaps is the measurement you want to check up on in Google

    Anyway the figure Ive read for VOP (ie the speed in which current/charge travels alongs a copper conductor) is 13,000m per second, that 13Km per second, always handy to rememnber in discussions when someone says they can hear the difference from a speaker with an odd length of speaker cables. Or read that another way as that the signlas passes every metre of cable at 0.00008 seconds.

    To the orginal poster, the longer you make the cable the more "resistance" you create for the amplifer to drive a current along its length. 15 metres should be fine, but depending on the listening levels you listen i would use some decent CSA of copper for my cabling.
     
  13. arn

    arn
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    got Gale HYPERLITZ in the end (move up in class as and when) will this be sufficent enough for a rxv350 and nsp100 setup(planning on getting some mission next)? or should i have bought a better cable?
     
  14. arn

    arn
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    i actually laughed out loud at that :D
     

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