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    changable tuning.. port questions

    im shooting for a Tunable port for my DC LV5.. i need help with my design.. its gonna be sub up/ port back around 3.2 after wood/port/bracing displacement

    External
    36w X 14t X 17d

    Internal
    34.5w X 12.5t X 15.5d = 3.87cuft minus .68cuft port disp = 3.19cuft

    Im going to divide the port into 2 horizontal sections using sanded and rounded .75MDF. directly in half so the port height will be 11.75H or 2 5.87h X 6w sections.. port displacement is .68cuft

    If my calculations are right tuning will change if i plug the bottom port..

    Unplugged
    11.75h X 6w X 17.3L = 45hz

    Plugged
    5.87h X 6w X 17.3L = 33-34Hz


    Will the 35.3sqin of port work for daily on the DC LV5? unplugged it is 70.6 SQin of port



    [CENTER]07 Dodge Magnum SXT- 2toned
    Wire: 0ga Memphis, Big 3
    Box: 4cuft at 38hz
    Subs: 1 American Bass HD D2
    Amp: Audio pipe 1500d
    Batts: Odyssey pc925




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    Re: changable tuning.. port questions

    Your daily plugged low tune port needs more area. Do interchangeable ports. Much easier




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    Re: changable tuning.. port questions

    its 11sqin per cube.. how is it much easier? i dont understand interchangable ports very well



    [CENTER]07 Dodge Magnum SXT- 2toned
    Wire: 0ga Memphis, Big 3
    Box: 4cuft at 38hz
    Subs: 1 American Bass HD D2
    Amp: Audio pipe 1500d
    Batts: Odyssey pc925

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    Re: changable tuning.. port questions

    what if i change the port

    5.87t X 7w X 21L = 33hz and 41sqin port. nearly 14sqin port per cuft.

    port displacement is 1cuft 3.87-1= 2.87cuft

    or

    5.87t X 8w X 24.3L = 33hz and 46.4sqin port. 18.2 sqin port per cuft

    port disp is 1.32. 3.87-1.32 = 2.55cuft



    [CENTER]07 Dodge Magnum SXT- 2toned
    Wire: 0ga Memphis, Big 3
    Box: 4cuft at 38hz
    Subs: 1 American Bass HD D2
    Amp: Audio pipe 1500d
    Batts: Odyssey pc925

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    Re: changable tuning.. port questions

    I would try to stay as close to the DD calc as possible and that is 16" per CuFt. But I think your 14"er will work good...



    A 10 that thinks it's a 15!
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    http://www.caraudio.com/forum/showthread.php?t=394806"]http://www.caraudio.com/forum/showthread.php?t=394806

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    Re: changable tuning.. port questions

    yeah imma go with the 14sqin. unless sumthin comes up



    [CENTER]07 Dodge Magnum SXT- 2toned
    Wire: 0ga Memphis, Big 3
    Box: 4cuft at 38hz
    Subs: 1 American Bass HD D2
    Amp: Audio pipe 1500d
    Batts: Odyssey pc925

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    Re: changable tuning.. port questions

    bump for opinions?



    [CENTER]07 Dodge Magnum SXT- 2toned
    Wire: 0ga Memphis, Big 3
    Box: 4cuft at 38hz
    Subs: 1 American Bass HD D2
    Amp: Audio pipe 1500d
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    Re: changable tuning.. port questions

    Did you actually calculate the tuning using 2 ports or did you just calculate it for one then plan on dividing the port? Because you can't just divide a port and keep the same length, it will affect the tuning. Also, for when the one is plugged, did you take into account the fact that one of your ports is now part of the net volume? That also will affect the tuning.

    I think this is more complicated than you think...interchangeable ports would be better.




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    Re: changable tuning.. port questions

    Good point....



    A 10 that thinks it's a 15!
    I build and design boxes! PM me for details..
    bballstarx124x Quote: Got it running today. Sounds amazing! I'm getting a lil windshield flex on only 500 watts!
    Refs: MTX9515, M@nJo, MSW Danny, 95Prober
    http://www.caraudio.com/forum/showthread.php?t=395576"]http://www.caraudio.com/forum/showthread.php?t=395576
    http://www.caraudio.com/forum/showthread.php?t=394806"]http://www.caraudio.com/forum/showthread.php?t=394806

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    Re: changable tuning.. port questions

    yes, i accounted the port displacement into both of my designs.. the one with 7in port width is 2.87 cuft after port displacement.. and YES i calculated both ports in the12volt port calculator..

    in a 36w X 14t x 17d box it is 3.87cuft before port displacement

    port (account for .75 brace/separator) 11.75t X 7w X 21L = 45hz
    half the port height (bc its plugged) 5.88t X 7w X 21L = 33hz

    thats what my calculations came up with. Subwoofer Enclosure Calculators, Fraction to Decimal, Parallel, Series, Port Length and Volume Calculators



    [CENTER]07 Dodge Magnum SXT- 2toned
    Wire: 0ga Memphis, Big 3
    Box: 4cuft at 38hz
    Subs: 1 American Bass HD D2
    Amp: Audio pipe 1500d
    Batts: Odyssey pc925

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    Re: changable tuning.. port questions

    if thats incorrect, plz help me understand. i crunched numbers for an hour comin up with this



    [CENTER]07 Dodge Magnum SXT- 2toned
    Wire: 0ga Memphis, Big 3
    Box: 4cuft at 38hz
    Subs: 1 American Bass HD D2
    Amp: Audio pipe 1500d
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    Re: changable tuning.. port questions

    Quote Originally Posted by abrhino View Post
    yes, i accounted the port displacement into both of my designs.. the one with 7in port width is 2.87 cuft after port displacement.. and YES i calculated both ports in the12volt port calculator..

    in a 36w X 14t x 17d box it is 3.87cuft before port displacement

    port (account for .75 brace/separator) 11.75t X 7w X 21L = 45hz
    half the port height (bc its plugged) 5.88t X 7w X 21L = 33hz

    thats what my calculations came up with. Subwoofer Enclosure Calculators, Fraction to Decimal, Parallel, Series, Port Length and Volume Calculators
    That's not what I'm talking about. All your calculations for when you have both ports open say that the port is 11.75H, which it's not, you have two ports that equal 11.75H. You can't just take a port and divide the height in half, it will affect the tuning. And I know for a fact you didn't do this because the12volt calculators don't allow you to enter that you have more than one port.




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    Re: changable tuning.. port questions

    Use the carstereo.com calc, you can enter as many ports as you'd like.



    1,400+ designs since March 2011...
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    Re: changable tuning.. port questions

    Quote Originally Posted by bubbagumper6 View Post
    That's not what I'm talking about. All your calculations for when you have both ports open say that the port is 11.75H, which it's not, you have two ports that equal 11.75H. You can't just take a port and divide the height in half, it will affect the tuning. And I know for a fact you didn't do this because the12volt calculators don't allow you to enter that you have more than one port.
    you're right. thanks

    Quote Originally Posted by RyanM923 View Post
    Use the carstereo.com calc, you can enter as many ports as you'd like.
    will do man, thank you



    [CENTER]07 Dodge Magnum SXT- 2toned
    Wire: 0ga Memphis, Big 3
    Box: 4cuft at 38hz
    Subs: 1 American Bass HD D2
    Amp: Audio pipe 1500d
    Batts: Odyssey pc925

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    Re: changable tuning.. port questions

    why is the12volt and carstereo.com port calculators so far off? I pluged in my current box on the12v and it it was 3hz off of carstereo's calculations

    current box

    is 4.99cuft before port displacement.. port is 14.5h X 5.5w x 16.75d which equals 40hz on Carstereo and 43hz on 12v



    [CENTER]07 Dodge Magnum SXT- 2toned
    Wire: 0ga Memphis, Big 3
    Box: 4cuft at 38hz
    Subs: 1 American Bass HD D2
    Amp: Audio pipe 1500d
    Batts: Odyssey pc925

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