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Reload Thread: i need help designing a ported box. all specs inside.

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    drkodin's Avatar
    drkodin is offline CarAudio.com Elite



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    i need help designing a ported box. all specs inside.

    could someone do me a favor and figure out the dimensions of a ported box for me?
    It will contain one 12" Audiobahn ALUM12Q sub (.18 displacement) and i want to use a slot port (tube port is an option, but i really dont want port noise).
    this will be for a SQL setup. i'm thinking anywhere from a tuning of 28-35, whatever is best.
    the dimensions of the box can not exceed:
    29" width
    15" height (14.5" is better as i may be able to squeeze in another couple inches on the length)
    13" length
    (total with 3/4" MDF is about 2cu ft before slot/sub displacement. reccomended is about that size.)

    i just got a lot of new tools for christmas and have always wanted to try a ported box. i have two of these subs sealed (1.1^3 each) and i would like to see how the one ported will compare in output.


    thanks in advance for any help.







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    drkodin's Avatar
    drkodin is offline CarAudio.com Elite

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    sub specs:
    Fs: 24.4Hz
    Qts: .47
    Qes: .52
    Qms: 4.8
    Vas: 2.26 Cu Ft
    Re: 5.4ohms
    Le: 2.7mH
    Mmd: 186 Grams
    Sd: 0.049 M2
    EBP: 47
    Efficiency: 96.4
    Displacement: .18 cu ft
    reccomended ported box size: 1.75+ cu ft




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    motoxstud's Avatar
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    i dont know much, but i know jmac can help ya out....




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    u know what? jmac... on behalf of everyone u help... id like to thank you... u take ur own personal time and help us noobs out... thanks especially for my box which i am talking apart soon since i got some wood glue...




  5. #5
    RangerMan's Avatar
    RangerMan is offline Premium Member RangerMan is a Supporting Member of the forum!



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    Originally posted by Jmac
    This is what I have so far ...

    Construction Material = .75" MDF
    Box Height = 14.5"
    Box Width = 29"
    Box Depth = 13"
    Number of Ports = 1 (Slot)
    Diameter of Ports = 13" x 1.75"
    Length of Ports = 32"
    Port Area = 22.75 square inches
    Box Volume = 1.6 ft^3 after all displacements except brace
    Box Tuning = 32.63 Hz
    WinISD Estimated Peak SPL = 119 dB @ 47.8 Hz + cabin gain
    WinISD Estimated Peak Port Velocity = 26.3 m/s @ 25.8 Hz
    Jmac...does it say that the average cabin gain is about 6 dB?



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  6. #6
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    **** Jmac................take a look @ my box post and give ideas please??? I can put up sub parameters soon.


    J



    "A man doesnt win a war by dying for his country. He does it by making the other poor dumb son of a beyotch die for his." Patton


    No system installed, but getting all the parts together.



    J

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