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Thread: 123A enclosures

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    123A enclosures

    First time post. I'd like to build some ported enclosures for a pair of 123A woofers I have. I was hoping to find the spec sheets JBL put out with their drivers that showed frequency response with specific enclosure and port. I've done some searches here but can only find Theile Perameters for the 123A. Unfortunately, I do not know how to design an enclosure using those perameters. I was wondering if anyone has an enclosure design they are happy with that I could mimic? I read up on the open baffle design but think I'd like to stick with a ported enclosure.

    Thanks for any help.

    Eric M.

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    Senior Member ratitifb's Avatar
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    http://www.jblproservice.com/pdf/thi...parameters.pdf

    look at 123A, 2213 (123A-3 like) TS parameters plus some experiments there

    http://www.audioheritage.org/vbullet...-TS-parameters

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    Thanks,

    I did run across both of those posts. I just don't know how to use those numbers to build an enclosure.
    Maybe a better question might be, where might I look for formulas using TS Perameters to build enclosures?

    Eric M.



    Quote Originally Posted by ratitifb View Post
    http://www.jblproservice.com/pdf/thi...parameters.pdf

    look at 123A, 2213 (123A-3 like) TS parameters plus some experiments there

    http://www.audioheritage.org/vbullet...-TS-parameters

  4. #4
    Senior Member ratitifb's Avatar
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    Quote Originally Posted by Eric M. View Post
    where might I look for formulas using TS Perameters to build enclosures?

    some litterature

    http://diyaudioprojects.com/Technica...xes-Part-I.pdf
    http://diyaudioprojects.com/Technica...es-Part-II.pdf

    http://www.hornlautsprecher.net/Doku...SPRMTRS604.htm

    and free WinISD sim software to download and play with

    http://www.linearteam.dk/?pageid=winisd

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    Thanks,
    Looks like I have some reading to do.

    Eric M.

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    Senior Member Horn Fanatic's Avatar
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    Quote Originally Posted by Eric M. View Post
    First time post. I'd like to build some ported enclosures for a pair of 123A woofers I have. I was hoping to find the spec sheets JBL put out with their drivers that showed frequency response with specific enclosure and port. I've done some searches here but can only find Theile Perameters for the 123A. Unfortunately, I do not know how to design an enclosure using those perameters. I was wondering if anyone has an enclosure design they are happy with that I could mimic? I read up on the open baffle design but think I'd like to stick with a ported enclosure.

    Thanks for any help.

    Eric M.
    Wasn't the 123A the original woofer used in the L100 Century cabinet?

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    Yes, I believe you're right. I read on another post that the L100 was not designed very well, the crossover did not even have a low pass filter. I would have used the cabinet and port dimensions of the L100, but I'm under the impression not much effort went into the design.





    Quote Originally Posted by Horn Fanatic View Post
    Wasn't the 123A the original woofer used in the L100 Century cabinet?

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    Senior Member ratitifb's Avatar
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    Quote Originally Posted by Eric M. View Post
    the crossover did not even have a low pass filter... , but I'm under the impression not much effort went into the design.
    the effort went probably into the driver design (cone profil, aquaplas, ...) allowing for the 123a the "wide open" sounding with respect to the LE5-2 low cutoff frequency at -6dB/oct. ...

    X-over upgrade :

    http://www.troelsgravesen.dk/JBL_L100.htm

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