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Help! How to locate a nail in speaker wire?

Discussion in 'Home Cinema Speakers' started by Freedom, May 8, 2005.

  1. Freedom

    Freedom
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    The story is that I have cables for a 7.1 system and currently using Yamaha
    RX-V640 receiver.
    During DVD playback the receiver switches off and when you switch it back on
    it says "CHECK SP WIRES" - meaning there is a problem.
    I have narrowed it down to only one wire - it goes to one of the two rear
    centre speakers. Everything used to work perfectly until i had new floors
    laid.

    During laying of the new floors my guess is that the tradesmen have hammered
    at least one nail into this wire! Trouble is that the wire is now under a
    wooden plant which is held by lots of nails (one or more of which are
    probably causing a problem).

    How does one go about locating the offending nail in a speaker wire ? Is
    there fast and easy way of doing it? Perhaps using some specialised
    equipment ?
     
  2. gil2

    gil2
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    never heard of specialised equipment to find a spiked cable , maybe disconecting your speaker cables , all of them to save any mishaps , then get a voltage meter with a tone for circuit completeon testing , and try to make a completed circuit by touching one of the rear speaker cable ends + and - and one of the nails in question , keep going til you hear the beep signaling circuit completion , a tedious job , but it will find your problem , assuming that the nails you mentioned are the ones to blame
     
  3. matblack

    matblack
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    This kit is available for CAT5 and fibre and is used to track issues in long runs of cable but I have never heard of one which works with speaker cable. :(

    MB
     
  4. spuddler

    spuddler
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    Hi,don't understand your exact situation but see if this will help.If you think a nail as been driven through your speaker cable(or there could just be a short).The offending nail will be in contact with both of your speaker cable's wire's(causing a short between + & -)so you should be able to get a circuit between the offending nail/nail's and the end of the cable.Whichever nail/nail's you can get a circuit to the end of your speaker cable(any end) by testing using a multimeter pull out.You could still be left with the problem that by pulling the nail out, the bare wire's inside the cable are now touching due to the damage caused by the nail.Hope this help's(let us know how you get on)

    Cheer's BOB
     
  5. spuddler

    spuddler
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    Hi,Please note don't do any testing while your AMP or speaker are connected to speaker cable!!!!!
    BOB
     
  6. matblack

    matblack
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    If you identify the offending cable and remove the nail then maybe you could attach a new length and pull a new cable through to replace the old damaged one

    MB
     
  7. spuddler

    spuddler
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    Hi,good idea matblack.If anybody read's this prob worth putting cable's in some type of conduit before plastering,covering with floorboard,s etc so that you can replace cable later?
    BOB
     

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