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Thread: calculating cone area

  1. 09-11-2007 08:28 PM #16
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    Re: calculating cone area

    sd = cone area

    it stands for surface displacement (ok ok thats just a guess lol)
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  2. 09-11-2007 08:31 PM #17
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    Re: calculating cone area

    Sd- Effective piston radiating area of a subwoofer driver in square meters. <----googled
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  3. 09-11-2007 08:37 PM #18
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    Re: calculating cone area

    Yes, the formula is A = Pi * r * r

    The obvious: It's the cone diameter (not the subwoofer diameter) that is used.

    Example: Polk 8" MM2048
    Mount Diameter: 7.0625in
    Diameter of cone: 6.65in (radius = 3.325in)

    3.14 * 3.325 * 3.325 = 34.71 sq-in

    (specs: http://www.polkaudio.com/caraudio/specs/mm2084/ )

    For the example above, I simply took the Sd and worked the formula backwards.
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  4. 09-11-2007 08:44 PM #19
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    Re: calculating cone area

    Only part of the surround is allowed to be used in calculating Sd. Even the part that gets used actually is a function of the movement of the cone and decreases as the cone moves further in and out.

    Most respectable sub companies will list Sd. I don't know any companies that I would buy from that don't.
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  5. 09-11-2007 08:47 PM #20
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    Re: calculating cone area

    Quote Originally Posted by Immacomputer View Post
    Most respectable sub companies will list Sd. I don't know any companies that I would buy from that don't.
    Agreed.
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  6. 09-11-2007 08:49 PM #21
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    Re: calculating cone area

    Quote Originally Posted by DejaWiz View Post
    Yes, the formula is A = Pi * r * r

    The obvious: It's the cone diameter (not the subwoofer diameter) that is used.

    Example: Polk 8" MM2048
    Mount Diameter: 7.0625in
    Diameter of cone: 6.65in (radius = 3.325in)

    3.14 * 3.325 * 3.325 = 34.71 sq-in

    (specs: http://www.polkaudio.com/caraudio/specs/mm2084/ )

    For the example above, I simply took the Sd and worked the formula backwards.

    Got it now.
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  7. 09-11-2007 09:59 PM #22
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    Re: calculating cone area

    http://www.the12volt.com/caraudio/thiele.asp

    "Effective piston radiating area of driver, in square centimeters. "This is the actual surface area of the cone, normally given in square cm.""

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  8. 09-12-2007 12:08 AM #23
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    Re: calculating cone area

    Quote Originally Posted by DejaWiz View Post
    Yes, the formula is A = Pi * r * r

    The obvious: It's the cone diameter (not the subwoofer diameter) that is used.

    Example: Polk 8" MM2048
    Mount Diameter: 7.0625in
    Diameter of cone: 6.65in (radius = 3.325in)

    3.14 * 3.325 * 3.325 = 34.71 sq-in

    (specs: http://www.polkaudio.com/caraudio/specs/mm2084/ )

    For the example above, I simply took the Sd and worked the formula backwards.
    ????help? my sub is 1029.2 cm2 how much sq-in is that?
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  9. 09-12-2007 08:34 AM #24
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    Re: calculating cone area

    Quote Originally Posted by jeremiah View Post
    ????help? my sub is 1029.2 cm2 how much sq-in is that?
    divide by 2.54 twice since is square-cm.

    1029.2 / 2.54 / 2.54 = 159.53 sq-in
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  10. 09-12-2007 08:43 AM #25
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    Re: calculating cone area

    DD is too cool to give t/s parameters.....
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  11. 09-12-2007 09:15 AM #26
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    Re: calculating cone area

    Quote Originally Posted by jeremiah View Post
    ????help? my sub is 1029.2 cm2 how much sq-in is that?
    Google that shit all day. Google's calculator converts all sorts of shit.

    http://www.google.com/search?source=...=Google+Search
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  12. 09-12-2007 09:20 AM #27
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    Re: calculating cone area

    Quote Originally Posted by Immacomputer View Post
    Google that shit all day. Google's calculator converts all sorts of shit.

    http://www.google.com/search?source=...=Google+Search
    Werd. I hit that up at least half a dozen times a week.
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  13. 09-12-2007 01:21 PM #28
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    Re: calculating cone area

    O ok I gat it 159.5263191
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  14. 09-12-2007 01:24 PM #29
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    Re: calculating cone area

    Quote Originally Posted by Immacomputer View Post
    Only part of the surround is allowed to be used in calculating Sd. Even the part that gets used actually is a function of the movement of the cone and decreases as the cone moves further in and out.

    Most respectable sub companies will list Sd. I don't know any companies that I would buy from that don't.
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  15. 09-12-2007 02:43 PM #30
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    Re: calculating cone area

    ^^?but TC is audiopulse?
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