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Thread: Anyone know of a reasonably acurate sealed box volume calculator?

  1. Back To Top    #1

    Anyone know of a reasonably acurate sealed box volume calculator?

    I've tried a couple and when I input identical driver parameters I get different enclosure alignments on the different calculators. I want to play a Scan 18W/4434G-00 down to circa 90hz in a not overly large enclosure...can anyone recommend a program?

    Thanks.18w-4434g00.pdf


    http://www.mh-audio.nl/Calculators/CBCQ.html

    http://sbp.softica.dk/2.0/en/

  2. Back To Top    #2

    Re: Anyone know of a reasonably acurate sealed box volume calculator?

    10 litres is pretty good for most drivers that size, and some want smaller... why do you think you’ll really notice a huge difference in 6l vs 10l for example... I would build it big and make it smaller with blocks inside ���� In reality you won’t hear any difference if you heard them in a double blind... it will only effect your mind as to which sounds different...

    sure if you put it in 1litre it will sound a bit boomy, but even then in a car it’s very hard to tell (I lived with some sb acoustics mfc17 in 0.8l test enclosures for 4-5 months and it wasn’t offensive... the Q of a driver/enclosure combination only effects the sound at or near resonance... the mid range doesn’t change very much (The speakers characteristics change that more than anything), so 90hz and up won’t be very different

    the slight differences are likely down to how the calculators take losses/damping materials into account (or not as the case may be)

  3. Back To Top    #3

    Re: Anyone know of a reasonably acurate sealed box volume calculator?

    Quote Originally Posted by Donanon View Post
    I've tried a couple and when I input identical driver parameters I get different enclosure alignments on the different calculators. I want to play a Scan 18W/4434G-00 down to circa 90hz in a not overly large enclosure...can anyone recommend a program?

    Thanks.18w-4434g00.pdf


    http://www.mh-audio.nl/Calculators/CBCQ.html

    http://sbp.softica.dk/2.0/en/
    WinISD.

  4. Back To Top    #4

    Re: Anyone know of a reasonably acurate sealed box volume calculator?

    Quote Originally Posted by dumdum View Post
    the slight differences are likely down to how the calculators take losses/damping materials into account (or not as the case may be)
    I like dumdum's reply overall. This part above is good about simulators too.

    The two sim websites the OP linked have very similar results. The difference is one website inserts a 0.2Ω resistance for what I assume is speaker wire, by default. If you turn this "off" by changing the default value to 0Ω then the results are almost identical.

    Both of those websites also agree pretty good with the sim I created too.



    http://www.mh-audio.nl/Calculators/CBCQ.html
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    http://sbp.softica.dk/2.0/en/
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    mine:
    (first graph is supposed to read spl and displacement)


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    but the most simple way is offered to you in the user manual:

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    Last edited by Justin Zazzi; 1 Week Ago at 03:07 AM. Reason: fixing my graphs
    Measure with mics, mark with chalk, cut with torch, grind to fit, sand to finish, paint to match.
    Do it for them.

  5. Back To Top    #5

    Re: Anyone know of a reasonably acurate sealed box volume calculator?

    Thanks for all the replies.

    My hope was that there would be a way to get the f3 I wanted in a small box but there is no getting around science. I'm going to go with the user manual recommended alignment and make it fit in the space I have.

    BTW. Justin, thanks for the detailed and very informative post.
    Last edited by Donanon; 1 Week Ago at 03:39 PM. Reason: Added thanks to Justin.

  6. Back To Top    #6

    Re: Anyone know of a reasonably acurate sealed box volume calculator?

    Quote Originally Posted by Donanon View Post
    My hope was that there would be a way to get the f3 I wanted in a small box but there is no getting around science. I'm going to go with the user manual recommended alignment and make it fit in the space I have.
    I really enjoy your practical approach to this problem.
    I wish this kind of common sense was more common.
    Measure with mics, mark with chalk, cut with torch, grind to fit, sand to finish, paint to match.
    Do it for them.

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