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Reload Thread: is my box design equation right? 3qf for 2 15l7?

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    SQ is the SQUAD's Avatar
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    is my box design equation right? 3qf for 2 15l7?

    car: 2001 chevy impala (big trunk)
    subs: 2 kicker 15l7
    amp: kicker 1200/1

    i am trying to make my own box and i want to make sure i got everything correct before i start cutting my materals
    i measures my trunk space as H=17.5" w=37" d=14" so i figured to make my box with everything 1 ince smaller (will assembel in trunk)

    these are the measurement i am planning on using
    h=16" w=36" d=12"

    using this equaiton is my cubic feet correct?

    (h-2*.75)*(w-2*.75)*(d-2*.75)/1728

    (14.5)*(34.5)*(10.5)= 52526.25/172 = 3.039

    does this make my box a 3 cubic ft box?


    my next big question is this is going to be a ported sql box, am i supposed to be using seperate chambers or one open chamber? most likely the speakers will be wired in together through one output so i would guess just one chamber.

    i really dident understand the info i found for calculating the port size so i am gonna need some help with that. dont know much about ports so i am open to any ideas







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    fo0manchu's Avatar
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    Re: is my box design equation right? 3qf for 2 15l7?

    i got the same numbers for volume. good luck




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    Re: is my box design equation right? 3qf for 2 15l7?

    just a lil more info

    i picked up to big sheets (about 4x10) sheets of 3/4 MDF, i got a big bottle of gorilla glue (already had it) i also hot somt little square wood pegs in 3ft lenghts to use as supports for insode my box. i am not sure if i am going to need the peg supports but i brought them anyways. the screws that i got where 8*2, i couldent find any 8*1 3/4, i shouldent run into any problems should i? i also stopped by autozone to pick up a fibreglass repait kit. i work at circuit city and a kid who works in the 12volt told me to fiderglass that inside seems to make them stronger. is this a good idea? i never heard of anyone else doing this. i am still searching the forum ti find alont of my answerrs, just trying to get a lil help on the way




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    Re: is my box design equation right? 3qf for 2 15l7?

    Quote Originally Posted by Jmac
    Your calculations are correct, but it's readily apparent that you have absolutely no idea what you're doing ...

    y dont you tell me what i am doing wrong insted of just leaving me in the air




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    Re: is my box design equation right? 3qf for 2 15l7?

    ok thanks,
    so the only way to really get more displacement is to add more depth i can come out more if needed but i can add any more to the with or hight. let me try to recalclate with more depth, how many cubes should i be aming for?




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    Re: is my box design equation right? 3qf for 2 15l7?

    here are my new calculations after a million searches

    h=16"
    w=36"
    d=20"
    3/4 mdf
    2 4" ports @9" long

    5.36 CF before
    4.65 CF after
    port tuning hertz = 33
    port area in square inches = 25.13

    am i getting closser

    still trying to find the suggested Cf for a ported 2 15l7 enclosure




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    Re: is my box design equation right? 3qf for 2 15l7?

    i might just splurge the $10 to have you design the box, eventhout i am almost there. i am just not sure how about making the slotted port. anyways let me looking into it a lil more and ill get back to you.

    thanks alot for all the help, its really appreciated




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    Re: is my box design equation right? 3qf for 2 15l7?

    I would say two of those subs need around 7 cu ft intotal to get the best preformance out of them. I experimented alot with my L7's before I decided on a box. I hated how they sounded in a small enclosure.




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    Re: is my box design equation right? 3qf for 2 15l7?

    and what is everyone opininon on filling the box with the cotton ploy stuff




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