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Reload Thread: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

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    SSS 18734's Avatar
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    Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    Here is a design requested by kfx450r. The box turned out to be 2.65 cubic feet (per chamber) after all displacements, tuned to 35.3 hz. There are 72.5 cubic inches of port. I made this one pretty quickly, so anyone is welcome to chime in with improvements/comments.

    Final Dimensions are:
    W 50"
    D 16"
    T 18 1/4"

    Start off by constructing the base, sides, back, double baffle, and the ports, in that order.





    You should make these double baffles before you put the port in. Sorry about the confusing order of these pics. Simply mark an "x" from corner to corner to get the center of the baffles. Make sure to get these cuts and the ports very precise. Also, "diameter" should read "radius."



    Finally, make sure the box is nice and sealed, then attach the front.



    If you use this, post a build log for me, please!
    -SSS
    Last edited by SSS 18734; 02-26-2009 at 11:25 AM.



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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    Subs up, ports up?




    Ben Hemp
    1992 GMC Sonoma Ext Cab NEW BUILD
    2008 MECA S1 KY State Champion, 151.0 dB
    2008 MECA S1 WorldChampion, 151.8 dB
    2010 MECA scores: 150.9 dB S2, 151.6 dB S3
    Refs: smd4life, Subst4nce, wccoug21, dacheatham, thegreatestpenn, jshak07

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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    Put a divider in the port. Also on assembly it would be easier to go Base > Back> Front/Ports > Top > Sides (front meaning the sides the subs are mounted to.) It is not fun squeezing a baffle between two pieces that are already attached. The tolerance may be tight, and your glue can get pushed or scraped away squeezing a piece in like that.
    Last edited by Moe Lester; 02-26-2009 at 12:12 PM.




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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    Thanks alot for the box layout. As for the other posts, would it be better to face subs forward and port up? Or subs up port forward? Either way wouldnt make a diff to me. Im not TOO worried about glue getting squeezed or pushed away, I usually screw a box down real good then put some silicone/caulking around every joint and smooth it out for maximum air tightness.




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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    how much do you charge, or is it free

    My box program is on my comp 100 miles away and I need a box design for 2 15" hdc3's



    2003 Chevy Trailblazer LT
    (2) 15" AQ HDC3 7.25 cubes tuned to 35 hz
    Rear Fill: Pioneer Premier TS-D602P
    Front doors: ID ctx65
    Kick: ID ctx65cs
    Sub amp: Crossfire VR4000D
    Interior amps: SAX 100.4, PPI pc4400.2 (ACTIVE)

    PM ME: I BUILD BOXES FOR LOCALS OR ANYONE AROUND MICHIGAN

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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    There is really no way to tell which firing direction will be best for you. The current design will work fine and if you are not planning on competing in all out SPL competitions i would not worry about it. The glue is what holds the box together, not the screws. However if you do assemble it in the order he has listed it will be much more of a pain piecing it together. If your cuts are straight and you lay a nice glue bead there is no need for caulking.

    I still stress putting a divider between the ports. Alot of turbulence will be created at the intersection without one.




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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    Quote Originally Posted by Moe Lester View Post
    There is really no way to tell which firing direction will be best for you. The current design will work fine and if you are not planning on competing in all out SPL competitions i would not worry about it. The glue is what holds the box together, not the screws. However if you do assemble it in the order he has listed it will be much more of a pain piecing it together. If your cuts are straight and you lay a nice glue bead there is no need for caulking.

    I still stress putting a divider between the ports. Alot of turbulence will be created at the intersection without one.
    What do you mean a divider between the ports? Like a sheet of MDF going down the middle of the port all the way making it 2 chambers? Or like a brace.




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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    Okay, thanks for the tip Moe. I'll fix this when I get back from class.

    I'm doing these for free when I have spare time. As long as people post their builds if they use my design, I'm happy! I'm trying to get better at sketchup
    Last edited by SSS 18734; 02-26-2009 at 04:05 PM.



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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    I would at least fire the subs forward. Firing the subs up is a good loss in my truck.




    Ben Hemp
    1992 GMC Sonoma Ext Cab NEW BUILD
    2008 MECA S1 KY State Champion, 151.0 dB
    2008 MECA S1 WorldChampion, 151.8 dB
    2010 MECA scores: 150.9 dB S2, 151.6 dB S3
    Refs: smd4life, Subst4nce, wccoug21, dacheatham, thegreatestpenn, jshak07

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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    Here is a revision. After all displacements, this box will be:
    2.43 cubic feet
    34.3 hz
    Ports are each (14.5" x 2.5") x 27.25" long, for a total port area of 72.5 square inches.





    Moe Lester brings up a good point. You'll want to start by assembling the base, the back, and one of the sides. Then assemble the double baffles and the ports. Lastly, attach the front, followed up by the remaining side. Make sure your cuts, especially your baffles, port divider, and port walls are very precise, as this type of box is easier to mess up than others.
    Last edited by SSS 18734; 02-26-2009 at 04:10 PM.



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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    I've also had 2 Type R 12's in my truck. They did a 150.0 @ the headrest and 151.x in the kick




    Ben Hemp
    1992 GMC Sonoma Ext Cab NEW BUILD
    2008 MECA S1 KY State Champion, 151.0 dB
    2008 MECA S1 WorldChampion, 151.8 dB
    2010 MECA scores: 150.9 dB S2, 151.6 dB S3
    Refs: smd4life, Subst4nce, wccoug21, dacheatham, thegreatestpenn, jshak07

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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    Sweet thanks for the revision, even brought the tuning down a little which i was wanting but not enuff to have you revise the layout.




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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    Yeah, I figured I might as well fix that since I was already redoing the ports.



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    Tw1st3d13 (2 Fi BL 15's)

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    Re: Ext. Cab Box Design: 2.5 cuft @ 34hz (2 12" Alpine Type R's)

    mind me asking what program you are useing to draw?




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