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Reload Thread: Best sub and port placement? **PICS**

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    Best sub and port placement? **PICS**

    Im planning on building a new box for my DD 9515 In my 1999 Honda CR-V, Right now i have both sub and port facing back, box is tuned to 50-55 hrtz I would like to build a box that is tuned a bit lower somewhere around 32-34 hrtz. What would be the best sub and port placement

    box needs to be 31 1/4" wide and no taller than 18" can go all the way back to the back hatch dont know the measurement on that right now



    Last edited by bumpincrv; 02-05-2008 at 01:57 AM.





    DD 9515 (dual 1.5 Ohm)
    American Bass VFL 200.1
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    CDT crossovers and tweeters
    Alpine mrp F250 4 channel
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    Refs: Etznova, FLOSSINON24S, BigBowtie, DDshredder, Jeremydanza90, Btnhfan, Yunvme666




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    Re: Best sub and port placement? **PICS**

    Anybody?





    DD 9515 (dual 1.5 Ohm)
    American Bass VFL 200.1
    Imigage Dynamics mids
    CDT crossovers and tweeters
    Alpine mrp F250 4 channel
    Panasonic HU
    Custom Built Box
    145.5 DBs




    Refs: Etznova, FLOSSINON24S, BigBowtie, DDshredder, Jeremydanza90, Btnhfan, Yunvme666

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    Re: Best sub and port placement? **PICS**

    Common for an SUV is sub up port back, but "best" can only be determined by trial and error.

    Why the 50-55Hz tuning???




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    Re: Best sub and port placement? **PICS**

    no thats what the box is tuned at now i would like to drop to 32-34





    DD 9515 (dual 1.5 Ohm)
    American Bass VFL 200.1
    Imigage Dynamics mids
    CDT crossovers and tweeters
    Alpine mrp F250 4 channel
    Panasonic HU
    Custom Built Box
    145.5 DBs




    Refs: Etznova, FLOSSINON24S, BigBowtie, DDshredder, Jeremydanza90, Btnhfan, Yunvme666

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    Re: Best sub and port placement? **PICS**

    see but i would also like to go bigger in box size so the box may be aginst the back hatch im not sure





    DD 9515 (dual 1.5 Ohm)
    American Bass VFL 200.1
    Imigage Dynamics mids
    CDT crossovers and tweeters
    Alpine mrp F250 4 channel
    Panasonic HU
    Custom Built Box
    145.5 DBs




    Refs: Etznova, FLOSSINON24S, BigBowtie, DDshredder, Jeremydanza90, Btnhfan, Yunvme666

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    Re: Best sub and port placement? **PICS**

    I vote sub up port back



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    Re: Best sub and port placement? **PICS**

    I was questioning why the original box was tuned so high....

    Around 4-4 1/2 cubes should work for that sub if it's like a 9515.




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    Re: Best sub and port placement? **PICS**

    Ttt





    DD 9515 (dual 1.5 Ohm)
    American Bass VFL 200.1
    Imigage Dynamics mids
    CDT crossovers and tweeters
    Alpine mrp F250 4 channel
    Panasonic HU
    Custom Built Box
    145.5 DBs




    Refs: Etznova, FLOSSINON24S, BigBowtie, DDshredder, Jeremydanza90, Btnhfan, Yunvme666

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    Re: Best sub and port placement? **PICS**

    you can lower your tuning a few ways. one is to lessen the net volume of the box by putting wood blocks or extra bracing inside (but not within the port). another thing you could do is break the port into separate sections so its not just one port, but 2 or 3 or 4



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    Re: Best sub and port placement? **PICS**

    Quote Originally Posted by thegreatestpenn View Post
    you can lower your tuning a few ways. one is to lessen the net volume of the box by putting wood blocks or extra bracing inside (but not within the port). another thing you could do is break the port into separate sections so its not just one port, but 2 or 3 or 4
    Wrong.

    If you reduce net volume of the enclosure while maintaining port length and port area you will increase tuning.

    If you reduce port area while maintaining port length you will lower tuning.




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    Re: Best sub and port placement? **PICS**

    Quote Originally Posted by BrianChia View Post
    Wrong.

    If you reduce net volume of the enclosure while maintaining port length and port area you will increase tuning.

    If you reduce port area while maintaining port length you will lower tuning.
    And as we all know, the changes aren't exactly linear. I tried to make a linear plot for algebra I in high school about port tuning vs. port area, and it just doesn't work without taking Vb and length into account (contrary to what I was told back then).




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    Re: Best sub and port placement? **PICS**

    Hey CR_V your box is not tuned to 50-55 its tuned to about 40 i should now i built the box



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    Re: Best sub and port placement? **PICS**

    We are not concerned about reusing the existing box guys

    he was asking which configuration generaly yeilds the best results in an SUV and i figured it was sub up port back, like stated above

    and i think a net vol. of 4.5 to 5.2 cubes



    99 Ext. Cab Sonoma
    Sub: 2- DD 9515 in 10cubes no wall
    Sub Amp:Stetsom 4K2D
    Midbass: AA carbon fiber mid
    midrange: 4" Tang Band
    Tweet: Seas
    Powered by: Memphis 3004

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    Re: Best sub and port placement? **PICS**

    Quote Originally Posted by etznova View Post
    We are not concerned about reusing the existing box guys

    he was asking which configuration generaly yeilds the best results in an SUV and i figured it was sub up port back, like stated above

    and i think a net vol. of 4.5 to 5.2 cubes

    Excatly





    DD 9515 (dual 1.5 Ohm)
    American Bass VFL 200.1
    Imigage Dynamics mids
    CDT crossovers and tweeters
    Alpine mrp F250 4 channel
    Panasonic HU
    Custom Built Box
    145.5 DBs




    Refs: Etznova, FLOSSINON24S, BigBowtie, DDshredder, Jeremydanza90, Btnhfan, Yunvme666

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    Re: Best sub and port placement? **PICS**

    Ttt





    DD 9515 (dual 1.5 Ohm)
    American Bass VFL 200.1
    Imigage Dynamics mids
    CDT crossovers and tweeters
    Alpine mrp F250 4 channel
    Panasonic HU
    Custom Built Box
    145.5 DBs




    Refs: Etznova, FLOSSINON24S, BigBowtie, DDshredder, Jeremydanza90, Btnhfan, Yunvme666

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