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    ultimate157's Avatar
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    Need help with calculations from Ported box Sticky

    Vd = Sd x Xmax
    (Where Sd = surface area of cone?)

    Sd = 3.372^2 * 3.14 = 35.76
    Xmax = 0.45 inches

    Vd = 35.76 * 0.45 = 16.092

    Now, as soon as I try to calculate required port area, with tuning of 35hz

    dV>/= 39.37*(Fb*Vd)^0.5
    dV = 39.37 * (35*16.092) ^ 0.5
    = 39.37 * 23.73
    = 934 sq inches of port area ??



    2003 Volkswagen Jetta GLI VR6
    Source: Pioneer 880 PRS *Active
    Tweeters: Soon to be Hat Imagine
    Midrange: Soon to be Hat Imagine
    Sub: 15" SSA Icon
    Box: 2.5^3 Sealed
    Amp: Soundstream Tarantula 2kW

    Feedback: http://www.caraudio.com/forum/showthread.php?t=278169




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    Re: Need help with calculations from Ported box Sticky

    Fi SSD12 used for reference.


    Vd = Sd*Xmax
    Vd = Sd (M^2) * Xmax (Meters)
    Vd = 0.048 * 0.021
    Vd = 0.001008

    dV >/ 39.37*(Fb*Vd)^0.5
    dV >/ 39.37 * (Fb*Vd)^0.5
    dV >/ 39.37 * (35*0.001008)^0.5
    dV >/ 39.37 * 1.878297101
    dV >/ 7.394855687
    dV >/ 7.39

    A = Pi*R^2
    A = Pi * R^2
    A = 3.142 * 3.695^2
    A = 42.89870455
    A = 42.90



    And you end up with 42.90 In^2 minimum vent area with tuning of 35 Hz.




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    Re: Need help with calculations from Ported box Sticky

    Ahh ... thank you. I didn't see anywhere in the sticky that said what units to put them in.



    2003 Volkswagen Jetta GLI VR6
    Source: Pioneer 880 PRS *Active
    Tweeters: Soon to be Hat Imagine
    Midrange: Soon to be Hat Imagine
    Sub: 15" SSA Icon
    Box: 2.5^3 Sealed
    Amp: Soundstream Tarantula 2kW

    Feedback: http://www.caraudio.com/forum/showthread.php?t=278169

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    berserker's Avatar
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    Re: Need help with calculations from Ported box Sticky

    You are welcome and I believe it doesn’t from what I have seen skimming through it just before doing this for you.




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    Re: Need help with calculations from Ported box Sticky

    Quote Originally Posted by berserker View Post
    You are welcome and I believe it doesn’t from what I have seen skimming through it just before doing this for you.
    Lv = [(1.463*10^7R^2)/(Fb^2*Vb)] - 1.463
    How about this equation ... 1.463x10^(7R^2) ..... comes out to be a number to the 40th power.


    BTW: Numbers I'm using are:

    for a TS/W106DVC Pioneer Premier. Have it laying around and I want to build a ported box for it.

    Fs 35.4
    Qms 10.46
    Qes 0.52
    Qts 0.5
    Vas 0.955
    Rms 2.453
    Mms 115.49
    Cms 1.8x10-4
    Diam 7.9in
    BL 17.62 (8Ohm)
    8.81 (2Ohm)
    Xmax .45in 11.5 MM (0.0115 meters)



    2003 Volkswagen Jetta GLI VR6
    Source: Pioneer 880 PRS *Active
    Tweeters: Soon to be Hat Imagine
    Midrange: Soon to be Hat Imagine
    Sub: 15" SSA Icon
    Box: 2.5^3 Sealed
    Amp: Soundstream Tarantula 2kW

    Feedback: http://www.caraudio.com/forum/showthread.php?t=278169

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    Re: Need help with calculations from Ported box Sticky

    Quote Originally Posted by berserker View Post
    Fi SSD12 used for reference.


    Vd = Sd*Xmax
    Vd = Sd (M^2) * Xmax (Meters)
    Vd = 0.048 * 0.021
    Vd = 0.001008

    dV >/ 39.37*(Fb*Vd)^0.5
    dV >/ 39.37 * (Fb*Vd)^0.5
    dV >/ 39.37 * (35*0.001008)^0.5
    dV >/ 39.37 * 1.878297101
    dV >/ 7.394855687
    dV >/ 7.39

    A = Pi*R^2
    A = Pi * R^2
    A = 3.142 * 3.695^2
    A = 42.89870455
    A = 42.90



    And you end up with 42.90 In^2 minimum vent area with tuning of 35 Hz.

    Where did you get 3.695 from?



    Refs:
    Patfitz9,Farkel,PowerNAudio,Qtrhorse,theCybe,Kicke R_TauruS,SWEET06CAMRY, mike dressure,vernisog, Racerx250, iceteebone

    Camaro Box build tutorial

    http://www.caraudio.com/forum/showthread.php?t=217344

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    Re: Need help with calculations from Ported box Sticky

    Quote Originally Posted by bholtmeier View Post
    Where did you get 3.695 from?
    dV is the required port diameter. R = 1/2 of the diameter. 1/2 of 7.39 = 3.695



    2003 Volkswagen Jetta GLI VR6
    Source: Pioneer 880 PRS *Active
    Tweeters: Soon to be Hat Imagine
    Midrange: Soon to be Hat Imagine
    Sub: 15" SSA Icon
    Box: 2.5^3 Sealed
    Amp: Soundstream Tarantula 2kW

    Feedback: http://www.caraudio.com/forum/showthread.php?t=278169

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    bholtmeier's Avatar
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    Re: Need help with calculations from Ported box Sticky

    Required port diameter?



    Refs:
    Patfitz9,Farkel,PowerNAudio,Qtrhorse,theCybe,Kicke R_TauruS,SWEET06CAMRY, mike dressure,vernisog, Racerx250, iceteebone

    Camaro Box build tutorial

    http://www.caraudio.com/forum/showthread.php?t=217344

  9. #9
    ultimate157's Avatar
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    Re: Need help with calculations from Ported box Sticky

    bump ... anyone have an answer to my 2nd question ?



    2003 Volkswagen Jetta GLI VR6
    Source: Pioneer 880 PRS *Active
    Tweeters: Soon to be Hat Imagine
    Midrange: Soon to be Hat Imagine
    Sub: 15" SSA Icon
    Box: 2.5^3 Sealed
    Amp: Soundstream Tarantula 2kW

    Feedback: http://www.caraudio.com/forum/showthread.php?t=278169

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