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Thread: Walnut H9800

  1. #1
    Senior Member John W's Avatar
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    Walnut H9800

    I recently finished constructing a pair of walnut h9800 horn copies based on the drawings put together for project May. Unfortunately I don’t have the computer automated machinery they used for the prototype horn, so had to go a little less hi-tech.

    Basically the method was:
    • reproduce one half of the horn profile in a sweeping 40 inch arc
    • cut these blanks to shape with the secondary profile
    • integrate in the horn mouth

    I don’t have a lot of pictures of the actual construction, but the key piece of machinery was an overhead router fashioned from a sturdy old 12 inch industrial radial arm saw. With a little extension of the travel for the overhead arm, this gave an easy way to adjust vertically, backwards and forwards, and the proper arc.
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  2. #2
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    Wow ! Staggeringly Beautiful !

    As always John , you impress me to no end

    Keep up the great work !


  3. #3
    Senior Member John W's Avatar
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    Here are the “plans” and a couple construction pictures.

    Check out the pile of sawdust. The material removed weighs more than the finished horns.
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  4. #4
    Senior Member John W's Avatar
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    I haven’t built the compensation network yet, the first step was to hook them up and produce some plots. These look fairly close to the plots previously posted for the 2435 on an h9800.

    Zilch, any last minute pointers on modifying a compensation network to this measured response?
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  5. #5
    Senior Member edgewound's Avatar
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    **wolfwhistle**

    Man o man....that's purty.

    You got skills, dude.
    Edgewound...JBL Pro Authorized...since 1988
    Upland Loudspeaker Service, Upland, CA

  6. #6
    Moderator hjames's Avatar
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    You have such a beautiful way with wood!
    Please - keep sharing your projects with us - I love seeing what you do!

    Gorgeous stuff!


    Quote Originally Posted by John W View Post
    I recently finished constructing a pair of walnut h9800 horn copies based on the drawings put together for project May.
    2ch: WiiM Pro; Topping E30 II DAC; Oppo, Acurus RL-11, Acurus A200, JBL Dynamics Project - Offline: L212-TwinStack, VonSchweikert VR-4
    7: TIVO, Oppo BDP103D, B&K, 2pr UREI 809A, TF600, JBL B460

  7. #7
    Administrator Robh3606's Avatar
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    Very nice looking horns you got there

    Rob

  8. #8
    Senior Member Hoerninger's Avatar
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    Very beautiful work!
    And thank you for the pictures.
    ___________
    Peter

  9. #9
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    They look really really good. Very good job.

    mats

  10. #10
    Senior Member jbljfan's Avatar
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    Ohmigosh!

    Great work John. Absolutely gorgeous horns (unlike my tag line below).

    It may be time to change that.

    Mike
    Vertical horn kind of guy

  11. #11
    Senior Member rs237's Avatar
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    very good work, congratulation.
    I build the straight A300 horn for my 2441 and I hope and would be glad if it becomes as good as yours.

    regards
    juergen

  12. #12
    Senior Member grumpy's Avatar
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    Nice job. I like the entry plate too.
    -grumpy

  13. #13
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    Is there any difference in sound if you lay them down in horisontal position ?

    mats

  14. #14
    Senior Member John W's Avatar
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    Thanks everyone.
    Next step is to get the compensation network together, work out the crossover and build a dedicated woofer section for the 2-way.
    I'm looking for a pair of LE14H-3 if anyone knows where I can get some.

  15. #15
    Senior Member John W's Avatar
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    Quote Originally Posted by matsj View Post
    Is there any difference in sound if you lay them down in horisontal position ?

    mats
    I tried that, but it's a little too early to tell. All the details on the crossover haven't been worked out. I'll keep you posted.

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