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Reload Thread: Schematics for 15'' Top Firing, Rear Ported Enclosure

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    Icon32 Schematics for 15'' Top Firing, Rear Ported Enclosure

    This enclosure is being designed for a Adire Audio Brahma 15dr4 MkIV being powered by a Hifonics 1606d amp. I mostly listen to rap/hip hop, but theres a little bit of everything on my ipod. I'm planning to install it in the back of my '03 Tralblazer, so space isn't much of an issue.

    The only thing I've decided on so far is that I want it to be top-firing and rear ported; other than that I'm pretty much in the dark as far as design goes. Right now I'm leaning towards somewhere around 30-35hz @ 3-4 cubic feet.

    Here are the specs on the driver:
    Fs 24hz
    Qes 0.59
    Qms 8.2
    Qts .056
    Vas 152 liters
    Re 2 x 3.3 Ohms
    Le 2 x 0.34 mH
    BL 19.0 N/A
    Xmax 28.5mm
    Sd 740 cm^2
    SPL 87.4 dB
    Pmax 600W


    If anyone can help me design/knows of a schematic that will suit my needs I will much appreciate a point in the right direction. Any help at all is appreciated, thanks beforehand.







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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    i dont know the driver displacement on that sub or your max width and height, so i used .2, try some of these, see if they work...

    1

    2



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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    Here are my designs for a 15" Fi BL. 4cu ft @ 32hz w/ 66" of port each.

    Model #1



    Model #2




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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    Quote Originally Posted by kicker06 View Post
    Here are my designs for a 15" Fi BL. 4cu ft @ 32hz w/ 66" of port each.

    Model #1



    Model #2

    what is the widthxdepthxheight on that box???



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    Hifonics 1206d



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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    When making top-firing, rear ported box, would it be a good/bad idea to double the baffle?




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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    It will never hurt to double the baffle. When you're dealing with high wattage systems like a Brahma + ~1500 watts, I'd double it without thinking.

    Inner bracing is very important also.




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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    Quote Originally Posted by kicker06 View Post
    Here are my designs for a 15" Fi BL. 4cu ft @ 32hz w/ 66" of port each.

    Model #1



    Model #2

    Do you happen to have the dimensions for the 2nd model?

    Also, when double baffling, do you use 2 identical size pieces of MDF, or do you make one that is 3/4'' smaller all the way around (centered on the top board), so that the inner piece would fit securely into the box (effectively doubling the surface area for gluing) this is assuming taking in to account the inner piece for volume calculations.....

    Any help is appreciated, thanks beforehand.




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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    Do 2 same size if you have the height, so you have to add 3/4" to your total height.

    Box 27wx28dx14h

    Port 25.5w x 2.5 h x 22.5 d

    For model #2, and those are ext dims.



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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    Yea, height isn't an issue at all, I'm not trying to keep it under a cargo cover or anything. On the 2nd design, does the placement of the sub matter at all? Aesthetically I would like to place it in the center, but would having it closer to the edges help support it?




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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    try to keep the sub away from the port opening inside the box



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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    Quote Originally Posted by mazdakid View Post
    try to keep the sub away from the port opening inside the box
    You want it near the front, because the port opens at the back.



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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    when you say near the front do you mean near the port or side opposite the port.



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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    I'd assume close to the port as illustrated by the picture.




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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    is there any disadvantage to mounting the sub directly in the middle...



    2008 TBSS
    Current Build:
    HU: DEH-80PRS
    Front Stage: ID CTX65CS
    Amplifier: Memphis Big Belle
    Subwoofer: TC Sounds LMS-R 12 in a High Output Enclosure 2.5 @ 30

    Too many CA.com transactions to list.

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    Re: Schematics for 15'' Top Firing, Rear Ported Enclosure

    Quote Originally Posted by dvrmstrng View Post
    is there any disadvantage to mounting the sub directly in the middle...
    I have no clue, but if I had to guess I would have to guess it had something to do with the port and airflow....




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