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Thread: Ambitious DIY Horn Project

  1. #1
    Member tinnitus's Avatar
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    Ambitious DIY Horn Project

    Good afternoon and happy holidays. I've been kicking around the idea of a fully horn loaded 3 way garage system. From looking through the vintage stuff on the jblpro site I like the look of the 5671 cinema setup. I'd like to change it up a bit based on a few drivers I have laying around.

    HF section wpould be a 2426H on a DIY tractrix horn, 800 Hz flare cutoff, with the HF coming in around 1600 Hz. MF section is a 2123 or M209-8A on a DIY tractrix horn, 175 Hz flare cutoff. The MF driver (whichever I and you help guide towards) would run from say 350 - 1600 Hz. LF ideally would be a 60Hz DIY Tractrix horn running up to 350Hz. The horn's length is about 25" with a 12" x 12" throat. I don't see the throat as the problem so much as the mouth. Plots have it coming in at 55" wide by 35" high (rough numbers). Making bending forms for that horn flare will take a bit of work. I don't have any LF drivers now that I want to use but initial thoughts are Altec 515-8G. The horn mouth could go up to a 15" x 15" throat and run 2245s as the LF horn drivers. Going up to an 18" driver reduces my LF horn length, no relief on the mouth.

    How far off target am I with this and what are the possible pitfalls in building besides LF horn size?

    Thanks in advance, Gary

  2. #2
    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by tinnitus View Post
    I've been kicking around the idea of a fully horn loaded 3 way garage system.
    Does "garage system" imply the primary goal is SPL over finesse?


    Widget

  3. #3
    Member tinnitus's Avatar
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    3 way DIY Tractrix

    I'm going for finesse. I say garage because I think the sheer size will most likely have it relagated to the garage. I'm indifferent to high SPL. It's about the sound, some looks and for a woodworker - THE BUILD.

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by tinnitus View Post
    I'm going for finesse. I say garage because I think the sheer size will most likely have it relagated to the garage.
    If you want bass below 40Hz, it will likely be gigantic. The best horn loaded system I have ever heard would be the Magico Ultimate. It is horn loaded to about 100Hz and is still a beast.


    Widget

  5. #5
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    In a sense Mr Widget is right and will could be labour of love (frustration) lasting a decade.

    http://www.artec-france.com/etudes.p...eaa4dcbbfd1413

    Go here, its all laid out for you.

    One of the pitfalls of such a high efficiency system is proportionally worse signal to noise ratio that can mask the potential gains of such a system.

  6. #6
    Senior Member Eaulive's Avatar
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    According to the calculator I got, a tractrix horn with a 40Hz cutoff and a 900cm² mouth will have a length of 220cm and a mouth of 29150cm² or 171 x 171 cm

    Still maneagable for a garage, unless tou want a stereo pair

  7. #7
    Senior Member timc's Avatar
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    Quote Originally Posted by Eaulive View Post
    According to the calculator I got, a tractrix horn with a 40Hz cutoff and a 900cm² mouth will have a length of 220cm and a mouth of 29150cm² or 171 x 171 cm

    Still maneagable for a garage, unless tou want a stereo pair

    Stereo might not be needed for subs, but Dual mono surely is nice


    -Tim
    2213 + 2435HPL w/aquaplas + H9800 (Matsj edition)

  8. #8
    Member tinnitus's Avatar
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    My horn calc has a 60Hz flare cutoff coming in with these params:
    12" throat x 40.63" high flare x 48.75" wide. I'm assuming the back chamber may be about 3-3.5 cf.

    Thanks for the link to the Magicos. Very inspiring.

  9. #9
    Member Horn Savant's Avatar
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    20 hz Tractrix horn
    [German cinema circa 1951]
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    Maybe you could find something here that would be useful.

    Allan.

    http://photofile.name/users/tda-audio/182333/

  11. #11
    Senior Member Beowulf57's Avatar
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    How about a folded corner horn that uses the walls of the garage?

  12. #12
    Senior Member jcrobso's Avatar
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    Well a "K" horn would work>

    Quote Originally Posted by Beowulf57 View Post
    How about a folded corner horn that uses the walls of the garage?
    The whole idea of the Klispch corner horn was how to get a 8' horn into a corner with a small foot print.

  13. #13
    Senior Member JoMoCo's Avatar
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    Cousin Bjorn's Nowegian Ambitious Horn Project

    Here Is an other example....
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  14. #14
    Senior Member Jan Daugaard's Avatar
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    Where can we read more about cousin Bjørn's horns?

  15. #15
    Senior Member spkrman57's Avatar
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    I second that request....

    Quote Originally Posted by Jan Daugaard View Post
    Where can we read more about cousin Bjørn's horns?

    Pretty cool stuff there!

    Ron sends...
    JBL Pro for home use!

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