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Thread: Wood Horn 3-way

  1. #1
    Senior Member John W's Avatar
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    Wood Horn 3-way

    I am putting together a driver lineup for a 3-way.

    Here is what I have:

    E145 15in Woofer

    1200hz Smith Horn

    076 like tweeter



    The 1200hz horn is from this thread:

    http://audioheritage.org/vbulletin/showthread.php?t=5454



    The 076 horn is something I have been working on. I have a 076 in my 222 disco and like the sound of them. I wanted something to mate nicely with the walnut smith horn, so I decided to copy these in walnut. I doubted my ability to match the oval, so I carefully measured and copied the inside and outside curves from my 076. I then reproduced these two profiles and mitered together a rectangular horn of the same dimensions.

    This is built on a 2402 driver so I also had to turn out a phase plug and housing on the lathe.

    I was fairly careful in my measurements of the original.

    I have tested them out on top of the L222, and they sound the same from what I can tell.



    I have located a place where I can take these and the smith horns and have them measured in a professional facility. But it is a little bit of a drive so I want to get a crossover together and test everything at once.
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  2. #2
    Senior Member John W's Avatar
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    I am currently planning to bi-amp the speakers, with a charge-coupled n333 for just the mid and tweeter. I have a variable active crossover for the woofer, and plan on cutting this in an 850hz. The crossover also has a high pass section that consists of a switchable bank of 4 .027uf capacitors that together with the impedance of the amplifier give a nice low-noise cutoff.



    The box design is around 4.25 ft3 with curved sides, roughly 20 x 40.



    I am just getting started on the box and the passive crossover.

    Does anyone have any recommendations, or see any problems in the design. Critical comments would be greatly appreciated.

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  3. #3
    Senior Member John W's Avatar
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    Also, should the tweeter go vertical or horizontal? I have made it square just in case I need to experiment.

  4. #4
    RIP 2011 Zilch's Avatar
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    Quote Originally Posted by John W
    Also, should the tweeter go vertical or horizontal? I have made it square just in case I need to experiment.
    Not sure, probably vertical. What I DO know is that it is very beautiful.

    You could run some measurements with an SPL meter to see what the polar dispersion pattern is....

  5. #5
    Super Moderator yggdrasil's Avatar
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    John that is a fantastic work you have done.

    Just a comment on placing the Smith horns. I had mine lying on top, for some days. At that time my wife and I had an understanding that this would last a while. After 6 days that while was over (my plan was 2-3 months) and I immediately had to rebuild the baffle on my speakers to make place for the Smith horns. I have not had the time to make it look at all presentable, but I have been listening. They sound even better when mounted inside the cabinet. Probably less vibrations.
    Johnny Haugen Sørgård

  6. #6
    Senior Member pmakres1's Avatar
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    VERY nice!!!

    IMHO, the tweeter should go vertical to mimic the dispersion pattern of the 076.

    This is extremely beautiful work!!!!!!!

    Very best regards,

    Peter

  7. #7
    Senior Member spkrman57's Avatar
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    Great design

    Can't wait to see the finished product and hear your evaluations on it.

    Ron

  8. #8
    Senior Member John W's Avatar
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    Thanks for all the input. I will get busy on the cabinets and crossovers and keep you posted.

  9. #9
    paragon
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    Wow !!!

    Fantastic good looking wood horns and phase plug !!
    Excellent drivers !! Very good work.



    Eckhard

    K145 (black)+ E145(red) in 150 L Reflex with same duct.
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  10. #10
    MatthiasA
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    very good
    very good
    very good

    what kind of wood is it ?

    walnut oder something else ?

    greeting Matthias

  11. #11
    Obsolete
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    Outstanding!

  12. #12
    Senior Member John W's Avatar
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    Yes, the horns are walnut.

    I am still considering different ways to make the box. I want to curve the sides. Has anyone kerf bent mdf (a bunch of vertical kerfs all but about 3/16 of the way thru), then back filled the kerfs with bondo, like for cars, perhaps reinforced with fiberglass cloth?

  13. #13
    Steve Gonzales
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    WOW!!

    That is some beautiful work, WELL DONE!!!!!

  14. #14
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    Have a look at this thread:

    http://audioheritage.org/vbulletin/s...ead.php?t=4229

    He is making an S2600, and is kerfing a bunch of mdf for the horn.

  15. #15
    MatthiasA
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    Quote Originally Posted by bbrown
    Have a look at this thread:

    http://audioheritage.org/vbulletin/s...ead.php?t=4229

    He is making an S2600, and is kerfing a bunch of mdf for the horn.

    yes that's me!
    you get it on better selected wood stores!
    in Germany "geschlitzes MDF"

    i do every round things with it!

    then back filled the kerfs with bondo, like for cars, perhaps reinforced with fiberglass cloth?
    what is bondo ?
    is it like 2 component putty mass?
    i prefer without fiberglass because you can better sharp it

    fiberglass in putty mass is you cannot good sharp


    greetings Matthias Asselborn
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