calculate a subwoofers Vd

Discussion in 'Speakers' started by MikeDuke, Sep 7, 2004.

  1. MikeDuke

    MikeDuke Stunt Coordinator

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    If I have all of the Thiel specs for my driver, how do I try to figure out what the Vd (displacement) might be. Is there a site that does this for you?

    Thanks
     
  2. Edward J M

    Edward J M Cinematographer

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    It's basically the effective surface area of the driver (Sd) multiplied by the maximum linear travel Xmax, multiplied by 2 for one full stroke (both directions).

    You might have to do some unit conversions to make it work out right, but the math isn't terribly challenging.
     
  3. MikeDuke

    MikeDuke Stunt Coordinator

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    Thanks for the reply.
     
  4. MikeDuke

    MikeDuke Stunt Coordinator

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    Does This look right?
    Sd=551.5
    Xmax=9mm
    551.5 Sq cm * 9mm *2=9927cc
    605 Cubic inches

    Thanks again.
    Forgive my ignorence
    Mike D
    I know what I like when I hear it. [​IMG]
     
  5. dave alan

    dave alan Second Unit

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  6. Edward J M

    Edward J M Cinematographer

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    551.5 cm2 x 9 mm (1cm/10mm) x 2 = 992.7 cm3

    992.7 cm3 (1Liter/1000cm3) = 0.9927 Liters (the most common unit to express Vd)

    or

    992.7 cm3 (1in3/16.39cm3) = 60.57 in3
     
  7. MikeDuke

    MikeDuke Stunt Coordinator

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    Thanks Dave and Ed for your reply.
    I know it may seem simple but I was never any good at this stuff. You know, figuring out equations. Being in L.D math in high school had its disadvntages. Thanks again for working it out for me.

    Mike D
    I know what I like when I hear it [​IMG]
     

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