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Reload Thread: is it better to make a box with or without sub displacement?

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    is it better to make a box with or without sub displacement?

    i wanna make a box for a fi q 12. i designed one with and another without sub displacement using re's box calculator. before disp. it was 2.3 @33hz. is it o.k. to use the plan without displacement or do i have to include that in the design? thanks in advance







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    Re: is it better to make a box with or without sub displacement?

    u can use the plan before displacement, but its better to use the one after displacement because that .16 cft3 from the sub will change the tunning a little. Unless ur mounting the sub inverted.



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    Re: is it better to make a box with or without sub displacement?

    include it to get the correct volume and tuning



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    Re: is it better to make a box with or without sub displacement?

    Ok, what's the REAL question.

    Make? or Design?

    That is the real question.

    nG




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    Re: is it better to make a box with or without sub displacement?

    Quote Originally Posted by ngsm13 View Post
    Ok, what's the REAL question.

    Make? or Design?

    That is the real question.

    nG
    design, then make




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    Re: is it better to make a box with or without sub displacement?

    There's so many calculators and bullshit online I honestly don't know what to tell you.

    Personally, I used winISD Pro most of the time if I have a computer nearby, if not it's by hand with a calculator.

    MOST calculators just spit out a port length.

    All the calculator cares about is NET volume. The volume with subwoofer atually "sees" after all displacements.

    So, given a NET volume, a port area, and a tuning, it spits out a port length.

    THEN, you must take you NET volume... add to that the port displacement volume... and the speaker displacement volume. Then you get the final GROSS internal volume the enclosure needs to be.

    This is the only way to really correctly design a proper enclosure.

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    Re: is it better to make a box with or without sub displacement?

    Don't forget to include the displacement of any bracing you use.



    -Evan.

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    Re: is it better to make a box with or without sub displacement?

    can someone help me with the design of my 12" fi-q box? the biggest box i can fit in my car is 21Wx21Dx14.5H. i want it at 2.2@33hz after displacment. is this even possible? i feel like i've tried every design but nothing works. thanks in advance.




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    Re: is it better to make a box with or without sub displacement?

    Quote Originally Posted by waggs View Post
    can someone help me with the design of my 12" fi-q box? the biggest box i can fit in my car is 21Wx21Dx14.5H. i want it at 2.2@33hz after displacment. is this even possible? i feel like i've tried every design but nothing works. thanks in advance.
    It'll be hard.

    I'd shoot for 2cubes @33hz, with my 20-30 sq. in. of port

    nG




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    Re: is it better to make a box with or without sub displacement?

    Quote Originally Posted by ngsm13 View Post
    It'll be hard.

    I'd shoot for 2cubes @33hz, with my 20-30 sq. in. of port

    nG
    will the q still sound good with that amount of space? i'm looking for great sq but also something loud...




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    Re: is it better to make a box with or without sub displacement?

    Yup, it will.

    nG




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    Re: is it better to make a box with or without sub displacement?

    Here you go, fits your spec perfectly:

    Desired Tuning Freq: 32.00 Hz
    Slot Vent Width: 2.00 inches
    Wood Thickness: 0.75 inches
    Driver Displacment: 0.18 cu/ft
    Number of Drivers: 1.00 qty
    Width= 21.00 inches
    Height= 15.00 inches
    Depth= 21.00 inches
    Port Length= 28.01 inches
    Driver Volume= 2.19 cu/ft
    Port Area= 27.00 sq/in

    PM me I can give you box cutts and/or a 3d drawing




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    Re: is it better to make a box with or without sub displacement?

    Quote Originally Posted by rpfuror View Post
    Here you go, fits yout spec perfectly:

    Desired Tuning Freq: 32.00 Hz
    Slot Vent Width: 2.00 inches
    Wood Thickness: 0.75 inches
    Driver Displacment: 0.18 cu/ft
    Number of Drivers: 1.00 qty
    Width= 21.00 inches
    Height= 15.00 inches
    Depth= 21.00 inches
    Port Length= 28.01 inches
    Driver Volume= 2.19 cu/ft
    Port Area= 27.00 sq/in

    PM me I can give you box cutts and/or a 3d drawing
    ooo so close i'm gonna fold the back seats down and slide the box in from the inside. the hight of the opening is 14 5/8" and i'm gonna try to squeeze 14 1/2 in through there. thanks for trying




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    Re: is it better to make a box with or without sub displacement?

    I just worked with your dimentions,

    you can get 2.1 cu/ft @ 34 Hz with the following:

    Slot Vent Width: 2.00 inches
    Wood Thickness: 0.75 inches
    Driver Displacment: 0.18 cu/ft
    Number of Drivers: 1.00 qty
    Width= 21.00 inches
    Height= 14.00 inches
    Depth= 21.00 inches
    Port Length= 23.63 inches
    Driver Volume= 2.10 cu/ft
    Port Area= 25.00 sq/in




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