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Reload Thread: 2 FI BL 12's.... NEED BOX HELP!!!!!

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    2 FI BL 12's.... NEED BOX HELP!!!!!

    Going on a IA mono 20.1

    2 FI BL 12"s

    slot, square port.

    flush mounted.

    what size port and box? - i though around a 6" wide port and 7 cubes

    should i double baffle and triple baffle the sub mounting side?
    or
    is is bracing all i need?
    if so...
    what type of bracing?

    max dimensions are (this is including the space i need for 3/4 mdf [take into mind the baffeling as it subtracts from the numbers even more]):

    width (driver side to pass side) - 40
    depth (ground to roof) - 23
    length (headlights to tail lights) - 20







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    Re: 2 FI BL 12's.... NEED BOX HELP!!!!!

    If you plan on giving them their RMS wattage, stick to 2.25ft^3 each with a tuning in the lower 30's. Overall volume before sub and port displacements will be about 6ft^3. You may or may not have to double up the mounting baffle, just depends on how you have everything laid out.



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    Re: 2 FI BL 12's.... NEED BOX HELP!!!!!

    how well do those BLs sound in the proper box ported as the OP stated ?



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    Re: 2 FI BL 12's.... NEED BOX HELP!!!!!

    Quote Originally Posted by jrouter76 View Post
    how well do those BLs sound in the proper box ported as the OP stated ?
    You're asking a very generic question lol.




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    Re: 2 FI BL 12's.... NEED BOX HELP!!!!!

    thanks man




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    Re: 2 FI BL 12's.... NEED BOX HELP!!!!!

    lol agreed... but i already drew it up on sketchup... gunna build it tomorrow... well see how it sounds




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    Re: 2 FI BL 12's.... NEED BOX HELP!!!!!

    i put them in 7 cubes at 36 Hz. 6" wide port, triple baffled the mounting layer and doubled all the rest. its going to be a heavy ***** but solid. im going to skip on bracing because oh how my joints are set up. i think i will be fine with wood glue, pressure and a finish nailer. pm me your number and ill send you pics as i build it.




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    Re: 2 FI BL 12's.... NEED BOX HELP!!!!!

    You put two strong 12s in a 7 cube box? Ripple city. Gonna sound like ish and be super boomy with an awful low end peak.



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    Re: 2 FI BL 12's.... NEED BOX HELP!!!!!

    Quote Originally Posted by surreal View Post
    You put two strong 12s in a 7 cube box? Ripple city. Gonna sound like ish and be super boomy with an awful low end peak.
    This. I personally wouldn't go over 4ft^3 for a pair. The thing that ***** about these low Q and Vas woofers is the need for a smaller box and a lot of power to get a decent response curve out of them while keeping output high. Granted, most people aren't looking for a smooth response if they're getting these kinds of subs.
    Last edited by RAM_Designs; 07-19-2011 at 02:23 PM.



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    Re: 2 FI BL 12's.... NEED BOX HELP!!!!!

    4.5 cubes tuned to 30 hz with about 60 square inches of port.



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