Optimal Box Sizes

Discussion in 'OT Technology' started by Ronin, Jun 3, 2006.

  1. Ronin

    Ronin Guest

    Well I got an idea for a thread, I was wondering if people could post box sizes and intended application for specific sub boxes.

    ie ngsm or someone who has experience with RL-p subs could post what they think are optimal box size dimensions, I figure this would be good for when we recommend subs we can also recommend what box to use or atleast give them some guidance. SQ application box size, SPL application box size, style, etc.

    Hopefully we can get a good list going and if people are willing to post their custom box sizes I can edit a big list in this original post and maybe it can be another sticky.

    I am aware manufacturers give dimensions but a lot of the time it seems people come up with their own :dunno:

    (edit: ill be redoing my tuts soon 2 as I told some people I would be doing a long time ago, i am a procrastinator)

    cliffs: list box dimensions for certain subs you have found to work well for you and the intended application
     
  2. XR250rdr

    XR250rdr OT Supporter

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    Optimal varies quite a bit from driver to driver. If you want it done right, get the driver you have in hand metered then build the box based on those specs.
     
  3. Ronin

    Ronin Guest

    thats what i mean

    couldnt we post sizes for specific drivers ie 12 inch RL-p ?

    not sure what you mean by getting a driver metered, havent heard that mentioned unless i heard it worded differently. what does this entail?
     
  4. XR250rdr

    XR250rdr OT Supporter

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    T/S parameters vary widely from driver to driver. I dont mean model to model or brand to brand. I mean individual drivers of the same make/model. Its surprising how much too, I've seen variations as much as 200% from manuf. stated specs.

    There are various setups to do the testing, but it can be done with a frequency generator (freeware + soundcard works), a decent amplifier, a multimeter, a few precise resistors and a known mass (nickels work great m = 5.000g). There is some math involved, but nothing that couldnt be put into Excel. I'll have to find the equations to do it.
     
  5. Doc Brown

    Doc Brown Don't make me make you my hobby

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    Yep. It's all about the ts parameters.

    Mostly, box size (vas) is determined by fs and total Q (Qts)

    And of course how low the person wants it to go down.

    The lower frequencies require an exponentially larger
    box.

    And of course a longer peak to peak woofer movement (Xmax).









    .
     
    Last edited: Jun 3, 2006
  6. Ronin

    Ronin Guest

    well it was worth a shot :hs:
     
  7. XR250rdr

    XR250rdr OT Supporter

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    There isnt anything wrong with having a table of boxes that have worked well for others. I just think its also important to make it clear that results may vary and testing one's own drivers is the key to consistent results.
     
  8. ngsm13

    ngsm13 New Member

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    As well as each person's application. Such as the overall goal of the setup, the amount of power on hand, space available.

    Precisely, manufacturers specs are not always correct. Some are exagerrated and some are just plain wrong sometimes.

    It's a good idea, but something I'd rather approach on a case by case basis almost.

    Just an fyi, excellent link... a lot of free designs... ;)
    http://www.caraudio.com/forum/showthread.php?t=137804

    w00t.
     
  9. Doc Brown

    Doc Brown Don't make me make you my hobby

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    I know with home audio speakers, it's fairly well known which
    manufacturers that you can trust the t/s parameters from.
    Is there such information from car audio available?














    .
     
    Last edited: Jun 5, 2006
  10. Ronin

    Ronin Guest

    bookmarked that link, thanks a lot :)
     
  11. ngsm13

    ngsm13 New Member

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    Indeed. QUITE helpful when I get the everday PM about enclosures... a lot fall into the ones supplied in that thread, if not... then I offer a custom design ;).
     
  12. Ronin

    Ronin Guest

    when i eventually get a sub for my car i may just send you a pm then :x:
     
  13. JRock10

    JRock10 Active Member

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    i just build the box exactly how the manufacturer says to. this is the BEST way. because they built the sub, so they should know how it will sound best!
















    :ugh:




















    :mamoru:
     
  14. JRock10

    JRock10 Active Member

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    oh and transmission line FTL. and when i say FTL, i mean for the LOUD. (and clean)
     
  15. ngsm13

    ngsm13 New Member

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    Lawl. You made me giggle. ;)
     

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