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    Need box design please! (2) JBL W12gti MkII

    I was hoping someone could make me a sealed box design for 2 JBL W12Gti MkII subwoofers, they are going in the back of my 2001 tahoe (3rd row removed) and will probably be getting around 600-800 watt rms a piece(depending on which amp i end up going with) I want something reasonably loud, but tight hence the reason im going sealed and not ported. Here is a data page with all the T/S info, and as far as size limitations, i think about 40 inches wide and no more than 16-18 inches tall depth isnt really a concern but if i had to put a cap on it i guess i would say about 30 inches. Thanks in advance!



    2001 Chevy Tahoe
    190a alternator
    Optima Yellow top under the hood Deka Group 31 yellow top in rear
    RD Audio Alpha Comp v2 components up front Tweeters replaced with Infinity Kappa Tweeters
    RD Audio Alpha Comp v2 components in rear
    Rockford Fosgate Punch P400-4
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    3X Jbl W12 Gti MkII's
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    Re: Need box design please! (2) JBL W12gti MkII

    Ok well I went out on my own and did some research and I believe I've came up with a pretty good box, comments suggestions are greatly appreciated!

    Width 30.5"
    Height 17"
    Depth 29 3/4"

    Vent height 15.5"
    Vent Width 4 1/2"
    Vent Length 21 1/2"





    The idea was to make the location of the port provide "bracing" for the box so that no additional bracing would be necessary, is this a good idea?
    Last edited by mrjoeyjiffy; 02-19-2008 at 10:01 AM. Reason: didnt do image tags right



    2001 Chevy Tahoe
    190a alternator
    Optima Yellow top under the hood Deka Group 31 yellow top in rear
    RD Audio Alpha Comp v2 components up front Tweeters replaced with Infinity Kappa Tweeters
    RD Audio Alpha Comp v2 components in rear
    Rockford Fosgate Punch P400-4
    2X Rd Audio 1750.1s
    Pioneer Avic-D3
    3X Jbl W12 Gti MkII's
    REFS: bizflawless, vitveet, Jando86, da box king

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    Re: Need box design please! (2) JBL W12gti MkII

    I got approx 7 cubes after port tuned at ~30 htz. Is this what you wanted it to be?

    The port will add some bracing.



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    Re: Need box design please! (2) JBL W12gti MkII

    yes i might make the box a dat bit shorter in depth, but its pretty close to what i want, should this box work well without any additional bracing?



    2001 Chevy Tahoe
    190a alternator
    Optima Yellow top under the hood Deka Group 31 yellow top in rear
    RD Audio Alpha Comp v2 components up front Tweeters replaced with Infinity Kappa Tweeters
    RD Audio Alpha Comp v2 components in rear
    Rockford Fosgate Punch P400-4
    2X Rd Audio 1750.1s
    Pioneer Avic-D3
    3X Jbl W12 Gti MkII's
    REFS: bizflawless, vitveet, Jando86, da box king

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    Re: Need box design please! (2) JBL W12gti MkII

    With that box bracing shouldnt be needed.



    1994 Toyota Camry
    Pioneer DEHP6400BT
    Rockford Fosgate 1050S
    12" DD 3512C
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    1050wrms@4ohms

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    Re: Need box design please! (2) JBL W12gti MkII

    will that be too much airspace? i want it tuned around 30 hz, the manufacturer says 2.25 cubic feet per sub in a ported box, but im thinking theyre saying the low end because most people are confined for space, would 7 cubic feet(closer to 6 cubic feet after port/driver displacement) be too much?



    2001 Chevy Tahoe
    190a alternator
    Optima Yellow top under the hood Deka Group 31 yellow top in rear
    RD Audio Alpha Comp v2 components up front Tweeters replaced with Infinity Kappa Tweeters
    RD Audio Alpha Comp v2 components in rear
    Rockford Fosgate Punch P400-4
    2X Rd Audio 1750.1s
    Pioneer Avic-D3
    3X Jbl W12 Gti MkII's
    REFS: bizflawless, vitveet, Jando86, da box king

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    Re: Need box design please! (2) JBL W12gti MkII

    Quote Originally Posted by mrjoeyjiffy View Post
    will that be too much airspace? i want it tuned around 30 hz, the manufacturer says 2.25 cubic feet per sub in a ported box, but im thinking theyre saying the low end because most people are confined for space, would 7 cubic feet(closer to 6 cubic feet after port/driver displacement) be too much?
    3 cubes net each, should work, and if you do make it too big you can add stuff to the inside of the box to make it smaller.



    1994 Toyota Camry
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    2.5 cuft, 35hz
    1050wrms@4ohms

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    Re: Need box design please! (2) JBL W12gti MkII

    Quote Originally Posted by mrjoeyjiffy View Post
    will that be too much airspace? i want it tuned around 30 hz, the manufacturer says 2.25 cubic feet per sub in a ported box, but im thinking theyre saying the low end because most people are confined for space, would 7 cubic feet(closer to 6 cubic feet after port/driver displacement) be too much?
    If they recommend 2.25, then I wouldn't make it any bigger than 5-6ft^3 net.




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    Re: Need box design please! (2) JBL W12gti MkII

    yeah they actually reccomend 2.25 including sub and port displacement, back to the drawing board...



    2001 Chevy Tahoe
    190a alternator
    Optima Yellow top under the hood Deka Group 31 yellow top in rear
    RD Audio Alpha Comp v2 components up front Tweeters replaced with Infinity Kappa Tweeters
    RD Audio Alpha Comp v2 components in rear
    Rockford Fosgate Punch P400-4
    2X Rd Audio 1750.1s
    Pioneer Avic-D3
    3X Jbl W12 Gti MkII's
    REFS: bizflawless, vitveet, Jando86, da box king

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    Re: Need box design please! (2) JBL W12gti MkII

    Alright I think I have this down, JBL calls for 2.25 cubic feet per sub gross, which would be 4.5 cubic feet for 2 subs, this box should have a gross volume of 4.7 cubic feet.

    Box:
    Width 28"
    Height 14"
    Depth 26"

    Vent:
    Height 12.5"
    Width 3"
    Length 18.4"

    Should be tuned to right at about 30 hz, I think this should work well, any suggestions/comments/criticisms are welcome.




    2001 Chevy Tahoe
    190a alternator
    Optima Yellow top under the hood Deka Group 31 yellow top in rear
    RD Audio Alpha Comp v2 components up front Tweeters replaced with Infinity Kappa Tweeters
    RD Audio Alpha Comp v2 components in rear
    Rockford Fosgate Punch P400-4
    2X Rd Audio 1750.1s
    Pioneer Avic-D3
    3X Jbl W12 Gti MkII's
    REFS: bizflawless, vitveet, Jando86, da box king

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    Re: Need box design please! (2) JBL W12gti MkII

    stick with the recomended internal volume (2.25cf3) per sub plus
    sub and port displacement and give it lots of port area



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    Re: Need box design please! (2) JBL W12gti MkII

    will the 3/4 inch of space around the smallest parts around the edge of the subwoofer be enough to support it?



    2001 Chevy Tahoe
    190a alternator
    Optima Yellow top under the hood Deka Group 31 yellow top in rear
    RD Audio Alpha Comp v2 components up front Tweeters replaced with Infinity Kappa Tweeters
    RD Audio Alpha Comp v2 components in rear
    Rockford Fosgate Punch P400-4
    2X Rd Audio 1750.1s
    Pioneer Avic-D3
    3X Jbl W12 Gti MkII's
    REFS: bizflawless, vitveet, Jando86, da box king

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    Re: Need box design please! (2) JBL W12gti MkII

    for anyone who cares im nearly done with the box, just a few more things to do, here are some photos. Note to anyone who lets the guy at lowe's cut your mdf watch them, this lazy piece of **** would cut through it then come back through it with THE SAW STILL RUNNING, 2 belts on a belt sander and a half an hour later and i have them close enough to fit together but definitely not perfect. Anywho here are some pics



    2001 Chevy Tahoe
    190a alternator
    Optima Yellow top under the hood Deka Group 31 yellow top in rear
    RD Audio Alpha Comp v2 components up front Tweeters replaced with Infinity Kappa Tweeters
    RD Audio Alpha Comp v2 components in rear
    Rockford Fosgate Punch P400-4
    2X Rd Audio 1750.1s
    Pioneer Avic-D3
    3X Jbl W12 Gti MkII's
    REFS: bizflawless, vitveet, Jando86, da box king

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    Re: Need box design please! (2) JBL W12gti MkII

    That looks good post the pics when all done i want to see.
    By any chance how should i do a box for 3 w12gti subs at 2.25 tuned for 30hz i am trying to figure out where do i put the port since its 3 subs?




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    Re: Need box design please! (2) JBL W12gti MkII

    ttt i have another question.


    I've since decided on building a new box with that same design just a bit taller and a bit wider so i can achieve nearly perfect (at least to the manufacturer's specs) airspace, port, etc. And also because everytime i look at it i get pissed at ol ******* will at my local lowe's for cutting it so terribly.

    ANYWAYS, my question is without a double baffle and these subs being as heavy as they are(nearly 40 lbs from what i understand) should i build some sort of support for the back of the woofer? thanks in advance.



    2001 Chevy Tahoe
    190a alternator
    Optima Yellow top under the hood Deka Group 31 yellow top in rear
    RD Audio Alpha Comp v2 components up front Tweeters replaced with Infinity Kappa Tweeters
    RD Audio Alpha Comp v2 components in rear
    Rockford Fosgate Punch P400-4
    2X Rd Audio 1750.1s
    Pioneer Avic-D3
    3X Jbl W12 Gti MkII's
    REFS: bizflawless, vitveet, Jando86, da box king

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