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Cable Routing & Speaker Interference

Discussion in 'Home Cinema Speakers' started by andyp, Mar 5, 2001.

  1. andyp

    andyp
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    I'm sure we have all read time and time again that one should route all
    speaker and signal cables away from mains cables to avoid any chance of
    picking up interference. But in reality, this is sometimes unavoidable. My
    current system, consisting: B&W 600 S1 speakers and a Sony DB940 AV amp is
    currently laid out such that the rear speaker cables run along side 240V
    mains cables. I do hear hissing occasionally in the rear channels only, but
    is this really due to the mains cables, or more likely due to the known
    problems with hiss on this Sony amp? I have been unable to isolate the
    speaker cables from the mains cables as yet to ascertain this, just wondered
    what the experts out there thought.

    Is there any means of shielding the speaker cables if indeed this is the
    problem?

    Thanks

    Andy P.
     
  2. Jeff

    Jeff
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    I made some biwire cables up and used silver plated nylon as a sleeve for shielding. Any minor hiss that I had before has totally gone. £48 per 5M from RS. I only have a small room, 5M was enough for the 3 fronts. I used heat shrink rubber sleeves to bond at each end, again from RS about £2.50.
     
  3. Black 5

    Black 5
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    andy,

    I'm not sure it is too critical. Hiss is not induced from the mains frequency of 50hz and is therefore almost certainly due to the quality of the other components in your system, including the cables. Interconnects that carry low level signals are a different matter however and should be carefully positioned away from mains cables or cross them at 90 degrees if otherwise unavoidable - why can't manufacturers agree on what side to put mains cables on a piece of kit anyway to help avoid too much of this?
     

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