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    do you see any problem with the box design/port position?

    designing my box for the silverado right now, it will house 3 dd 1508's powered by an IA 20.1. two subs will downfire, 1 will fire up. port is tuned to 39hz, with 48in^2 of port area. box is 3.1 cubic feet after port, sub, and tranny hump displacement. my question is will the location of my port cause any problems? and i have been debating with myself, but will i have to wire the one firing up out of phase with the 2 downfiring? box is 55 x 13.5 x 13 external dimensions using 3/4" MDF. anyone see any problems with this or where i could walk into some?

    Last edited by blackbonnie; 03-26-2008 at 11:10 PM.



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    Re: do you see any problem with the box design/port position?

    ttt



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    Re: do you see any problem with the box design/port position?

    itll make noise, other designs may be more efficient though. you tryin to hide em and say your runnin just 1 or what?



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    Re: do you see any problem with the box design/port position?

    i want them all downfiring but the way there is the hump in the middle i cant have them all downfire



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    Re: do you see any problem with the box design/port position?

    You can't fit two of them on one side?

    Or all three in a pyramid shape on one side?

    I wouldn't want a sub right next to the port opening. Would cause some turbulence issues. I mean, it would probably work ok, but I would try to fit them a different way just to avoid any issues that MIGHT happen.




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    Re: do you see any problem with the box design/port position?

    Quote Originally Posted by tommyk90 View Post
    You can't fit two of them on one side?

    Or all three in a pyramid shape on one side?

    I wouldn't want a sub right next to the port opening. Would cause some turbulence issues. I mean, it would probably work ok, but I would try to fit them a different way just to avoid any issues that MIGHT happen.
    agreed

    i would think you can fit them all on one side, downfiring, and put the port on the opposite side.



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    Re: do you see any problem with the box design/port position?

    are you talking about the one firing up or the one below the port?



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    Re: do you see any problem with the box design/port position?

    Quote Originally Posted by blackbonnie View Post
    are you talking about the one firing up or the one below the port?
    The one firing up is right next to the port opening isn't it?

    That's what i gathered from your pic.




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    Re: do you see any problem with the box design/port position?

    i will try to see if can fit them on one side downing but one side only give me 20" x 11.5" so i think it would not be possible to downfire all 3 on 1 side. maybe 2 down and 1 up



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    Re: do you see any problem with the box design/port position?

    yes it is



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    Re: do you see any problem with the box design/port position?

    Put two on one side and one on the other.




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    Re: do you see any problem with the box design/port position?

    downfiring like that? so all downfiring just 2 on one side and the other below the port? you dont see any problems with it below the port like that? that was my biggest concern due to the port so close the the hump and the little air space



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    Re: do you see any problem with the box design/port position?

    I would rather have all of them downfiring versus one firing up.

    Instead of squaring it off, how about fiberglassing over the hump? That would help out airflow a lot.




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    Re: do you see any problem with the box design/port position?

    yeah i thoguht about that too, but i have never worked with fiberglass on a project that big. the biggest thing i was worried about is air flow getting trapped in the area below the port. it seems to compact. does anyone else think that could happen? i have decided to move the subs, and will prolly do all 3 downfiring with one in the area below the port and 2 on the other side. anyone think that would cause any issues. i might try my hand at fiberglassing later on but right now its just MDF for me. stick to what i know and get some more experience with the glass



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    Re: do you see any problem with the box design/port position?

    any more opinions, im working on a new sketchup to have in a bit. post what you think



    here is the new design/sketchup of it? same dimensions as above. port is tuned to 39hz, with 48in^2 of port area. box is 3.1 cubic feet after port, sub, and tranny hump displacement. box is 55 x 13.5 x 13 external dimensions using 3/4" MDF. anyone got an opinion or more opinions on either of these designs.

    which one is better? why? and do you think i will run into any problems with the sub being underneath the port like that with only about 3 3/4" or airspace for the pressure to exit? just looking for the best possible option. here is the old design that i was going to go with.

    Last edited by blackbonnie; 03-27-2008 at 10:09 AM.



    HU - Pioneer 800prs
    Mids - Peerless HDS nomex 6.5's
    Highs - Seas Prestige Alumi-domes
    Front Stage Amp - Sundown 100.4D
    Sub - SA-12
    Sub Amp - Saz-1000D
    Wire - Knukonceptz, Kicker Hyperflex

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