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Reload Thread: ported box.. which one

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    jjoven1225's Avatar
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    ported box.. which one

    i never made a ported box before, and im experimenting one for a friend.. which one would be better?? using a PVC pipe (exact port diameter + length) or building the port as a box.. like this http://www.subzoneusa.com/zv_series.htm

    do you tune the box? or the amp?

    also the sub requires 2 ports, and port length is 14.75" and port diameter is 3"


    also anyone have a good link "how to build ported box" or tuning them or whatever
    i've built sealed boxes before just never port and would like to learn, thanks for help



    Lexus IS300




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    Trixter's Avatar
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    You tune the box to the freq. you want.

    Round ports are good if you have the room and the manufacture gives you the diameter and length. Slot ports are good if you have a small box and need so much port area that a round port would be too long or you know what the port area of the box should be and the manufacture doesn't give you the demensions. It's just easier to figure w/o knowing the length and diameter, just the area.

    Since you have the length and diameter, I would go w/ the round ones...provided your box can handle the length. ((That's what I told her. )) Anyway, check out this and ignore the formula. It may help.http://jlaudio.com/tutorials/ports/index.html



    2006 Jeep Liberty
    Adire Audio, Cadence, Clarion, MB Quart

    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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    jjoven1225's Avatar
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    i really dont want to go with the round port, cuz i think slot port looks better.. also since i have the length and the diameter, should i just match the length or of port, with the duck (slot) and same thing with the diameter, just get the area of the rectangle, i figure that's the same thing.. someone help..
    that formula was way too confusing..



    Lexus IS300

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    dbirkes's Avatar
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    If i use this design of box could i just combine the two slots (the dotted line). or would it sound better to keep them seperated?
    Attached Thumbnails Attached Thumbnails ported box.. which one-box.jpg  




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    so if each port was tuned to 40 and i combined them, it would still be 40?




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    I just realized that was a STUPID question. how would you fiqure the length?




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    in regards to my pic, would you measure down to where it splits and then add the length of the horizontal part?




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    paikiah's Avatar
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    Originally posted by Jmac
    No ...
    jmac? Still alive and well?

    where've you been? Last I heard, your health failed you for a moment.. you ok now?



    Team Caraudio

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    Bass drive-by's are uncool.

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    dbirkes's Avatar
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    so how would you recommend i build it?




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    paikiah's Avatar
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    Originally posted by dbirkes
    so how would you recommend i build it?
    man, are you lucky you got jmac to calculate the box for ya...


    jmac, just so you know, my box is solid man, your specs... a little too mcuh though, the sub blew its own gasket off, had to get new surrounds...but now it's fine... thanks for everything



    Team Caraudio

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    Bass drive-by's are uncool.

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    dbirkes's Avatar
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    Would this be better?
    Attached Images




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    I'd have two ports. i have the formula from jl on how to do two ports




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    Two ports would be fine as long as you are calculating the TOTAL port area.



    2006 Jeep Liberty
    Adire Audio, Cadence, Clarion, MB Quart

    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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    Originally posted by jjoven1225
    i really dont want to go with the round port, cuz i think slot port looks better.. also since i have the length and the diameter, should i just match the length or of port, with the duck (slot) and same thing with the diameter, just get the area of the rectangle, i figure that's the same thing.. someone help..
    that formula was way too confusing..
    To find out the size of a slot port using round port numbers....

    you said you needed two ports being 3" X 14.75". This gives you a total port area of 277.89" (3 X 3.14 X 14.75 X 2 = 277.89) This is the area your slot port needs be. Take the opening of the slot L x W (let's just say 3" x 9" to get an opening of 27sq.") What X 27 would give you 277.89??...10.29". That is how long the port wound have to be.



    2006 Jeep Liberty
    Adire Audio, Cadence, Clarion, MB Quart

    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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