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    soldiermedic's Avatar
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    Numbers are weird or I'm retarded.

    Win ISD gave me some numbers on a ported box, but I don't understand how the port length is so high...got a vent length of 102.62 in. How does that work? I'm new at this...How do I read this?







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    Re: Numbers are weird or I'm retarded.

    what size port? 12 inch? change the port size see what happens



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    Re: Numbers are weird or I'm retarded.

    you must've used the wrong units somewhere. recheck your units of measurement



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    Re: Numbers are weird or I'm retarded.

    Port is 3 inch by 11.5 inch. When I decrease the vent diameter, the required port length decreases, which makes no sense to me...unless I am reading things wrong.




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    Re: Numbers are weird or I'm retarded.

    I redid the port measurements...the original ones were the speaker manufacturers specs. A little editing, I got .7 cubic ft box, 1.5x12" port with 53.83 inches in length. Why is it when I make the port narrower, the length gets shorter?




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    Re: Numbers are weird or I'm retarded.

    because the lower sq in of port area, the shorter port you need for the same tuning, its basic box design

    ps a .7 cubic ft PORTED box is tiny, i hope its for an 8 or somethin, and even then thats too small




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    Re: Numbers are weird or I'm retarded.

    It's for a 10, but I am looking to create a flatter response. when I increase the box size, I get a huge discrepancy with a difference of 6 db's both ways at whatever frequency I set it at. But when I decreased the size of the box, I got the balance back. I know this makes the box abnormally small for a ported box, but I am willing to risk it unless someone can talk me out of it.




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    Re: Numbers are weird or I'm retarded.

    P.S. winISD models never EVER duplicate real world results in a vehicle




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    Re: Numbers are weird or I'm retarded.

    Quote Originally Posted by soldiermedic View Post
    It's for a 10, but I am looking to create a flatter response. when I increase the box size, I get a huge discrepancy with a difference of 6 db's both ways at whatever frequency I set it at. But when I decreased the size of the box, I got the balance back. I know this makes the box abnormally small for a ported box, but I am willing to risk it unless someone can talk me out of it.

    If you want a flat response, you want a larger, ESB style box tuned really low. Smaller boxes are for tuning higher and being boomy at a very specific frequency for SPL purposes. If you want a super flat response, get something like 1.5 cubes with the port volume already subtracted and go for like 25 square inches of port area. For example, a port that is 2 inches wide and 12 inches tall would be 24 sq. in of port area and would be fine for a 10, large enough to not get port noise. Then you make the port longer or shorter length wise to set the tuning. Just use the RE Box calculator if you're going for a simple slot-port design. You can tweak each aspect of the box and it'll even give you a cut-sheet to build the box with.

    Best of luck



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    Re: Numbers are weird or I'm retarded.

    What is an ESB style box? (noob)




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    Re: Numbers are weird or I'm retarded.

    Quote Originally Posted by soldiermedic View Post
    What is an ESB style box? (noob)
    Sorry, mis-typed that. I meant "EBS".

    EBS boxes are purposely built larger and lower tuned than recommended. This makes for a box that doesn't have any extremely high peaks at certain frequencies. It keeps a very even response at most frequencies with really really good low end extension.

    These boxes are pretty big though, you've gotta have some space to spare.

    If you were originally planning to do like a single 12" in say 1.5-2 cubic feet, and EBS box would be like 2.5 cubic feet tuned under 25 Hz.



    ----My Two 10's Flexin' ----
    http://www.youtube.com/watch?v=hLrj5PmrKVM
    Quote Originally Posted by mossberg385t View Post
    im calling goob greedy because the ad revenue was suppost to go to site maintenance and upkeep, i havent seen anything but a slow *** server, a virus, self centered mods, and excuses to be expected from steve meade. I just hope the money is going to a good cause such as a heroin addiction

    I design and build boxes.
    References
    http://www.caraudio.com/forum/showthread.php?t=404022


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    Re: Numbers are weird or I'm retarded.

    Quote Originally Posted by DNick454 View Post
    Sorry, mis-typed that. I meant "EBS".

    EBS boxes are purposely built larger and lower tuned than recommended. This makes for a box that doesn't have any extremely high peaks at certain frequencies. It keeps a very even response at most frequencies with really really good low end extension.

    These boxes are pretty big though, you've gotta have some space to spare.

    If you were originally planning to do like a single 12" in say 1.5-2 cubic feet, and EBS box would be like 2.5 cubic feet tuned under 25 Hz.
    Thanks, you just clarified 10 hours of looking at my computer in 20 minutes.




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    Re: Numbers are weird or I'm retarded.

    so what do you think of BassBoxPro 6 DNick454 ??
    ive tried winisd and never had good results.




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    Re: Numbers are weird or I'm retarded.

    Quote Originally Posted by SicAudio View Post
    so what do you think of BassBoxPro 6 DNick454 ??
    ive tried winisd and never had good results.
    I've never heard of them, I'll check it out.




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    Re: Numbers are weird or I'm retarded.

    Quote Originally Posted by SicAudio View Post
    so what do you think of BassBoxPro 6 DNick454 ??
    ive tried winisd and never had good results.
    I'd say the easiest, and most accurate, box calc's are the ones offered by RE Audio and the one on www.bcae1.com

    The easiest is the RE Audio one, but that only for slot ports. The bcae one you can adjust for all different sizes and dimensions for ports including round ports but you need to know a little more information. The bcae one also can't do curved ports, so you have to do some figuring out on your own there.


    EDIT: If you're looking for the one on bcae1.com It can be a bit hard to find, it is a rather large database. There is the main page for viewing, then there is like a little tiny scroll-down page on the right with the directory of information. The one you are looking for with all the box building calculators is number 110. It's a ways down. Good luck



    ----My Two 10's Flexin' ----
    http://www.youtube.com/watch?v=hLrj5PmrKVM
    Quote Originally Posted by mossberg385t View Post
    im calling goob greedy because the ad revenue was suppost to go to site maintenance and upkeep, i havent seen anything but a slow *** server, a virus, self centered mods, and excuses to be expected from steve meade. I just hope the money is going to a good cause such as a heroin addiction

    I design and build boxes.
    References
    http://www.caraudio.com/forum/showthread.php?t=404022


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