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Reload Thread: What kind of material for box? And how about air space?

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    hogger's Avatar
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    What kind of material for box? And how about air space?

    Hey whats up. Ive decided to go with two JL w3 12's and a 500s punch amp in my car. I am about to start building my box but IO am not sure what kind of wood to get. What is the right typed of wood to get and about how much is it a sheet? Also how much airspace should there be per speaker?? Thanks guys.







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    Hogger,

    The box should be built out of 3/4" Medium Density Fiberboard. It can be found at your local Home Depot. The box for the two JL W3's should be 2-3 cubic feet. If you have plenty of power, put them in the 2 cubic foot box. If you are running <450 watts in all, and have the space, put the subs in a 3 cu. ft. box.

    It should sound good. :p




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    Oh, I forgot you said that you were using the 500s. Go with a 2 - 2.5 cubic foot box.




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    A 4' by 4' sheet of 3/4 MDF (what they call it at Home Depot) is around $11.00. that should be plenty for your box, maybe some left over for an amp rack.




    '94 Dodge Ram Std. Cab Sport Red

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    Is that 2-2.5 cubic feet per sub or is that 1-1.25 cubic feet for each one. When I build my box should I make a seperate chamber for each sub?? Thanks yall




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    That really depends on the sound/outcome you want.




    '94 Dodge Ram Std. Cab Sport Red

    100' Sound Deading
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    ID & Adire Front Stage
    Adire Audio 12" Shiva Mk. III

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    2.0 - 2.5 for BOTH subs. I am copying this straight from JL's site. You might want to try looking there for some more info.




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    I'm not exactly sure how JL decides on how much air space they should use. I know that I use a method to arrive at a Qtc value. The lower the Qtc (to a certain point) the better. I've tried out the same sub in varying Qtc systems. At .8 Qtc, it sounded like butt, the low end dropped off severely and the sound was boomy and not tight. I put the same sub in a .65 Qtc system, and it sounded sweet and low and tight. I'm sure if the Qtc got too low, it wouldn't sound right and not handle much power. Basically, the larger the box, the lower the Qtc. The Qtc values that a 2.5 box on the JLs should be around .75 or .8

    I'm sure is sounds good, but wouldn't it sound better in a lower Qtc system? I'm sure every subwoofer has its own characteristics, but I"m just tossing this info as something to think about when deciding on how big of an enclosure you want. Every time I've built a sub, I went just a tad larger than manufacturers specs and been very happy every time.



    DEX-P9 (headunit)
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    Scan-Speak 7" 18W/5535A midbasses
    Subs still pending.

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