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Connecting powered speakers to a sound card

Discussion in 'Electronic Basics' started by [email protected], Dec 26, 2007.

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  1. Hi,
    I have just run cables around the house with the idea of sending audio
    output to various powered speakers from the PC's sound card. This
    works well with the shorter leads which use standard cables bought
    with jack plugs fitted. The longer cables are made from high quality
    twin speaker cable, with jack plugs fitted by me. The output from at
    least one channel is faint and there is also a hum heard. My question
    is whether this is most likely due to the fact that the speaker cables
    are not screened, or is it more likely that I have a bad connection in
    the jack plugs or other cable joints ( I have had to connect the jack
    plugs to a short length of thinner wire as the speaker cable is too
    thick)?
    Many thanks for any guidance,
    Rod
     
  2. The line level signals travel this sort of distance through
    almost any kind of wire, so I doubt the weak signal is
    anything but a broken wire or bad connection at one end.
    These are rather high impedance signals, so fatter wire does
    little good, and increases the capacitive load across the
    pair and to the surroundings.

    However, such signals are only a volt r so, and will pick up
    less competing hum when running near power lines in the
    walls, if they run in shielded wire. A shielded twisted
    pair (signal and ground in the pair) would work best, if the
    shield is grounded only at the receiving end (shield and
    ground conductor of the pair connected together at the
    receiving end, shield unconnected at computer end).
     
  3. JANA

    JANA Guest

    You should be using shielded audio interconnect wire for line level audio.
    The shield at each end must go to the ground side of the source and
    destination equipment being connected. The wire should be run where it is
    not parallel to power wires.

    --

    JANA
    _____


    Hi,
    I have just run cables around the house with the idea of sending audio
    output to various powered speakers from the PC's sound card. This
    works well with the shorter leads which use standard cables bought
    with jack plugs fitted. The longer cables are made from high quality
    twin speaker cable, with jack plugs fitted by me. The output from at
    least one channel is faint and there is also a hum heard. My question
    is whether this is most likely due to the fact that the speaker cables
    are not screened, or is it more likely that I have a bad connection in
    the jack plugs or other cable joints ( I have had to connect the jack
    plugs to a short length of thinner wire as the speaker cable is too
    thick)?
    Many thanks for any guidance,
    Rod
     
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