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    4" Flared Ported Enclosure

    I recently bought one rockford 15" T2d4 sub and rockfords10001bd one-channel amp. I customize the box using two 4" flared ports instead of straight ported to have some space. The two ports are tuned at 37hz. I'm big on the rap & r&b so is this a good set-up for this sub to get good lows and spl anyone? Here are my calcs. for the the enclosure.

    net internal vol. = 3.25 cu.ft.
    port vol. = 0.19 cu.ft.
    sub. displacement = 0.176 cu.ft.
    total internal vol. = 3.62 cu.ft.
    box dimensions = 26"(w) x 18"(d) x 17"(h)
    trunk dimensions = 35"(w) x 43"(d) x 17"(h)

    Thanks,

    dgibb79







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    Re: 4" Flared Ported Enclosure

    i would personally tune it to about 30-32hz.



    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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    Re: 4" Flared Ported Enclosure

    IMHO, you should tune lower than 37hz.

    Being big on rap, there are notes that go lower than 37hz.
    Especially having a 15" woofer (easier to hit low notes), don't waste your time tuning higher for spl.
    That will really bring your setup to life.





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    Re: 4" Flared Ported Enclosure

    and you might also need more port area




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    Re: 4" Flared Ported Enclosure

    2 4" flared ports will do fine for a single 15". i have a pair for my 15 and they sounded better than a slot with 60sq".



    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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    Re: 4" Flared Ported Enclosure

    i have four 4 inch external ports for my 15. i dont think 2 would be enough. my box is 4.0 cube tuned to mid 30's.



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    Re: 4" Flared Ported Enclosure

    Quote Originally Posted by 15nissen View Post
    i have four 4 inch external ports for my 15. i dont think 2 would be enough. my box is 4.0 cube tuned to mid 30's.
    are they flared?

    my box was 3.5cu' tuned to 32hz with 2 4" precision ports. with 1200w i did a 146+db on the TL. now i have the same volume with 60sq" of port, same tuning, and can't get past 142db. over all the box with the 2 4's sounded better also. that's all i'm going on.



    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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    Re: 4" Flared Ported Enclosure

    Quote Originally Posted by Trixter View Post
    are they flared?

    my box was 3.5cu' tuned to 32hz with 2 4" precision ports. with 1200w i did a 146+db on the TL. now i have the same volume with 60sq" of port, same tuning, and can't get past 142db. over all the box with the 2 4's sounded better also. that's all i'm going on.
    Can't go on anything better than 1st hand experience.





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    Refs:
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    Re: 4" Flared Ported Enclosure

    try a smaller slot trix




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    Re: 4" Flared Ported Enclosure

    i have one that is built to adire's spec that sounds better then my current one and has more spl. i think it has like 28sq" or so. i'm just too lazy to swap them. the one with the 2 4" ports i sold for $50.



    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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    Re: 4" Flared Ported Enclosure

    37 is great for rap



    And there really isnt all that many low notes in rap.

    Jmac put up these graphs of the notes used in some rap songs, the lowest were like 34/32 iirc



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    Re: 4" Flared Ported Enclosure

    isnt chopped stuff usually lower




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    Re: 4" Flared Ported Enclosure

    Quote Originally Posted by Trixter View Post
    i have one that is built to adire's spec that sounds better then my current one and has more spl. i think it has like 28sq" or so. i'm just too lazy to swap them. the one with the 2 4" ports i sold for $50.
    Are flared ports betteR?



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    Re: 4" Flared Ported Enclosure

    personally i think flared ports are better than a slot or straight tube ports.



    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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    Re: 4" Flared Ported Enclosure

    Quote Originally Posted by Trixter View Post
    personally i think flared ports are better than a slot or straight tube ports.
    In what way spl/sq?



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