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Mismatched cable length from pre to power amp - is it OK?

Discussion in 'Cables & Switches' started by theo cupier, Jan 31, 2005.

  1. theo cupier

    theo cupier
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    I'm upgrading from an integrated amp to a pre/power combo, with a separate AV processor, so I will end up with:

    processor -> power amp (for rear and centre channels)
    and
    processor ->pre-amp -> power amp for front channels of 5.1

    I need to route the processor (Yammy E800) via the pre-amp since all my audio sources are connected to the pre-amp and I am using a single 5-channel power amp.

    Question:
    Do I need the total length of interconnect between processor and power amp (whether direct or via pre-amp) to be the same for all channels? Ie:
    processor ->2m-> power amp mixed with
    processor ->1m-> pre amp + pre-amp ->1m-> power amp

    Would it matter if the direct channels were shorter than those routed via the pre? For example:
    processor ->1m-> power amp mixed with
    processor ->1m-> pre amp + pre-amp ->1m-> power amp
    ?
    If I could get away with connecting like this, it will save me a little money since I only need to buy 5x1m interconnects to add to what I have already!

    Any advice greatly appreciated.
     
  2. davehk

    davehk
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    You don't need to match the cable lengths. Time delays are minuscule (the signal propagates at about 180,000,000 metres/sec, and with those cable lengths reactive losses are so small that the difference will be insignificant.
     
  3. Mark Grant

    Mark Grant
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    Hello Theo,

    You will be fine with those lengths :)

    If front left and front right where hugely different lengths that might not be ideal for music, but you will be OK,


    Mark.
     
  4. eviljohn2

    eviljohn2
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    As has already been said, there's no problem at all. If you had a few 10's of metres difference then you might hear a difference but moving your head a few centimetres would have a more audible effect.

    If you want to do the maths, then use the electron speed above and use the speed of sound as 330m/s. The simple Speed = Distance/Time formula is all you need. :)
     
  5. theo cupier

    theo cupier
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    Thanks guys. I thought as much but better safe than Swedish (as my father used to say) :D

    Mr Grant - as soon as I've got my new AV rack sorted out I'll be on to you for some more of your fabulous cables :thumbsup:

    Cheers

    Theo
     

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