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    help me tune

    i am going to make a box for 2 sony 10's. the airspace for both subs is going to be 2.46 before sub and port discplacement. anybody with a box tuning prog. plz see what size ports and length of the ports and number of ports i would need to tune the box to 32 hz. much thanx in advance





    Quote Originally Posted by unbonyr
    I just took it allitle to harsly I just sick of narrow-minded people




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    Re: help me tune

    got the max deminsions?

    T/S parameters would help too!




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    Re: help me tune

    Quote Originally Posted by DBfan187
    got the max deminsions?

    T/S parameters would help too!
    here's box dimensions (external)

    height.....................14"
    length.....................56"
    top depth...............5 3/4"
    bottom depth..........8 1/4"
    correction on airspace as well.......its 2.16....sorry

    T/S parameters
    impedance..............4 ohms
    d(mm)....................217
    d(inch)....................8.5
    Rdc(ohm sign).........2.4
    Fs(Hz).....................29.7
    Qts........................0.45
    Qes.........................0.48
    Qms........................6.62
    Vas(Lit.).................36.6
    Vas(Cu.ft)................1.29
    Mms(g).....................149.2
    Lvc(mH)......................0.9
    Xmax(mm)..................7.9
    Xmax(inch)................0.3
    BL(Tm).......................11.8

    whewwwww....hope my comp dont freeze up





    Quote Originally Posted by unbonyr
    I just took it allitle to harsly I just sick of narrow-minded people

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    Re: help me tune

    WHOA! Is this a truck box? If it is, could you draw out the box for me?




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    Re: help me tune

    i'll have pics of the box design tonite but i'm not real sure why u need a picture of the box design





    Quote Originally Posted by unbonyr
    I just took it allitle to harsly I just sick of narrow-minded people

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    Re: help me tune

    alright jus click on my gallery and it is the first pic.......and the top number is a lil blurry but it is........5 3/4
    is that ALL u need to know cuz i'm kinda needin to know soon???????





    Quote Originally Posted by unbonyr
    I just took it allitle to harsly I just sick of narrow-minded people

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    Re: help me tune

    Make your port at the top of the box going straight down. 4" x 2" slot port for 32Hz.


    edit* 7.62" long




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    Re: help me tune

    Quote Originally Posted by DBfan187
    Make your port at the top of the box going straight down. 4" x 2" slot port for 32Hz.


    edit* 7.62" long
    whoa whoa.......what happened to pvc.....but i kinda like your idea better really. are you ABSOLUTLEY sure on those measurements cuz i do not want to make another box.
    few questions as well
    1. put port in middle of box?
    2. include the 3/4" of thickness of wood at top of box in port length?
    3. most slot ports i see are huge, why are these so small? is it because of the small size of the box?
    4. why is the port length so short?
    thanx





    Quote Originally Posted by unbonyr
    I just took it allitle to harsly I just sick of narrow-minded people

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    Re: help me tune

    any1 know the above questions????





    Quote Originally Posted by unbonyr
    I just took it allitle to harsly I just sick of narrow-minded people

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    Re: help me tune

    Quote Originally Posted by DBfan187
    Make your port at the top of the box going straight down. 4" x 2" slot port for 32Hz.


    edit* 7.62" long
    Dont do that, use 4" dia PVC pipe, make it 14" long for at tune of 32hz.





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    Re: help me tune

    now i'm confused........someone who knows what the hell they are doinn clear this up





    Quote Originally Posted by unbonyr
    I just took it allitle to harsly I just sick of narrow-minded people

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    Re: help me tune

    Quote Originally Posted by packerfan
    Dont do that, use 4" dia PVC pipe, make it 14" long for at tune of 32hz.
    WinISD says your way is tuned to 30.76Hz.

    Mine is tuned to 32Hz.




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    Re: help me tune

    so either way i go it will be tuned in the neighborhood of 30-33 hz
    any1 wanna back db up cuz i want to make sure this is tuned rite





    Quote Originally Posted by unbonyr
    I just took it allitle to harsly I just sick of narrow-minded people

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    Re: help me tune

    I get a box volume of 2.17cu'

    For a 4" round port 12.3" long is 32Hz and for a 4" x 2" slot port 3.76" will produce 32Hz.

    Use this very simple formula:

    LV: vent length
    R: radius of vent (Note: for a square vent R will be the sq.rt of A/Pi)
    FB: tuning freq.
    VB: box volume in cu"

    4" round port:

    LV = [(1.463 x 10^7 x R^2) / (FB^2 x VB)] - 1.463R

    12.3 = [(58520000) / (3839754.24)] - 2.926

    4" x 2" slot port:

    LV = [(1.463 x 10^7 x 1.6) / (FB^2 x VB)] - (1.463 x 1.6)

    3.76 = [(23408000) / (3839754.24)] - 2.3408



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    Lv = [(14630000 x R^2) / (Fb^2 x Vb)] - 1.463R
    *Vb = vol. in cu"
    **R = sq.rt. A / Pi (for square/slot port)

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    Re: help me tune

    Quote Originally Posted by Trixter
    I get a box volume of 2.17cu'

    For a 4" round port 12.3" long is 32Hz and for a 4" x 2" slot port 3.76" will produce 32Hz.

    Use this very simple formula:

    LV: vent length
    R: radius of vent (Note: for a square vent R will be the sq.rt of A/Pi)
    FB: tuning freq.
    VB: box volume in cu"

    4" round port:

    LV = [(1.463 x 10^7 x R^2) / (FB^2 x VB)] - 1.463R

    12.3 = [(58520000) / (3839754.24)] - 2.926

    4" x 2" slot port:

    LV = [(1.463 x 10^7 x 1.6) / (FB^2 x VB)] - (1.463 x 1.6)

    3.76 = [(23408000) / (3839754.24)] - 2.3408
    Eh, nobody's perfect!




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