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Single Wound vs Double Wound Strings

  • 1.  Single Wound vs Double Wound Strings

    Posted 05-05-2021 23:57
    What is the inharmonicity difference between single wound and double wound bass strings?

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    Cobrun Sells
    cobrun94@yahoo.com
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  • 2.  RE: Single Wound vs Double Wound Strings

    Registered Piano Technician
    Posted 05-06-2021 00:48

    Doesn't matter.  For a given speaking length (and pitch), the determinants of inharmonicity are the core wire diameter and the overall diameter of the wrapped portion  

    That being said, generally double wraps occur because the core wire is thinner and there's a maximum differential that can exist between the core wire diameter and the outer wrap diameter before you start having trouble with the wrap remaining tight to the core. Don't recall what that ratio is off the top of my head. The point being that a double wrap with a thinner core wire will have lower inharmonicity than the same outer diameter with a thicker core wire as you would see with a single wrap. 



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    David Love RPT
    www.davidlovepianos.com
    davidlovepianos@comcast.net
    415 407 8320
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  • 3.  RE: Single Wound vs Double Wound Strings

    Registered Piano Technician
    Posted 05-06-2021 12:48
      |   view attached
    For those interested and want to play with scaling data themselves, attached here is a spreadsheet that I don't much care if it's disseminated for general use and education.  The columns in yellow are the only ones where you should change the inputs.  Everything else is calculated.  On this spread sheet you can also assign ribs to unisons if you are the sort to make those kinds of calculations when designing rib scales for soundboards.  Have fun.


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    David Love RPT
    www.davidlovepianos.com
    davidlovepianos@comcast.net
    415 407 8320
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