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Thread: 1200Hz Smith horns for 1" driver

  1. #16
    Super Moderator yggdrasil's Avatar
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    I run this test on my laptop with a demo-version of WINAIRDD.

    The titanium dia's are rolling off earlier than the phenolics?

    The results were checked on a Klark Teknik real time analyzer with a test microphone, showing the same results, but actually they were readable.

    Phenolics -3 to 0 db from 800 to 8000.
    Titaniums -4 to +3 db from 800 to 8000. (-5db from 400...).

    Tried the signal generator on another software, but with that software the resulting curve was only flat from 1.6K to 4K measuring on the Klark Teknik. Did not have the cables etc. to use the Klark Teknik as a signal source.
    Johnny Haugen Sørgård

  2. #17
    Administrator Mr. Widget's Avatar
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    Did you ever get a calibrated mic? I would bet it is the mic and not the horn that is HF limited and perhaps even affecting the frequency response curve as there really should be a radically different curve between these two above 8KHz.

    Widget

  3. #18
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    Johnny,

    I use this program...but user beware.

    Did you make a calibration curve with the cables and everthing in the loop ie from the souncard out to the amp and then back to the input of the card?

    Second, I always Gate the time response to get rid of the room effects and measure at 1 metre, any closer and you get proximity effects off the mouth of the wave guide and will lead to false readings, and use 44.1 khz sample rate and 2048 or 4096 sample length...your response about 10Khz is chopped.


    Below is an example

    Hope this helps.

    Talk some more on the weekend.

    Ian

    T
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  4. #19
    Super Moderator yggdrasil's Avatar
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    No calibrated mic in the computer setup.

    I saw a Behringer mic at parts express, think maybe its time to order this one, and upgrade to the full version winairr.

    In the mean time I can just have fun playing
    Johnny Haugen Sørgård

  5. #20
    Senior Member spkrman57's Avatar
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    Impressive work

    Is someone going to document the plans and add them to the technical library on this site?
    Ron

  6. #21
    Super Moderator yggdrasil's Avatar
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    I tried measuring on a 2441 on 2380 (in store for a future project..).

    This unit cut of earlier in both ends than the LE85 on the smith horn.

    Conclusion: serious amount of erroneus information in test setup. Will be back with more info when this is sorted out.
    Johnny Haugen Sørgård

  7. #22
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    I use a Panasonic capsule mounted in the end of 1/4 inch diameter tube and a small battery powered pre amp...the sound card preamps will be too noisy with the pc internals . The Beringher mic is a good buy.

    The above curve is the 2307 without the lense using the 2425 dias incl th crossover function of 3145 network.

    Ian

  8. #23
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    Quote Originally Posted by yggdrasil
    I tried measuring on a 2441 on 2380 (in store for a future project..).

    This unit cut of earlier in both ends than the LE85 on the smith horn.

    Conclusion: serious amount of erroneus information in test setup. Will be back with more info when this is sorted out.
    Why not invite The Widget for a visit and holiday and bring Clio to help measure your horns.

    But lock up your woman! Trust me. Muhhahahaahahahahahahaha.

    Macka
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  9. #24
    Super Moderator yggdrasil's Avatar
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    Widget are you ready for some serious fishing. In this picture, the kids got 16 pounds of cod in one throw...... DAD!!!! FISH!!!!


    The fishing season / summer is coming fast now. Midnight sun - YOU WON'T BELIEVE IT. Have to be experienced.
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    Johnny Haugen Sørgård

  10. #25
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    This is what Westlake uses to mount a 1" driver to there small wood horn in the SM-1 studio moniter. The hole is a straight 1" bore. The aluminum plate is 1/2" thick.
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  11. #26
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    Here is some more.
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  12. #27
    Senior Member John W's Avatar
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    I have a pair of 1" drivers also, so am following this thread with great interest.
    While looking through the previous threads regarding these type of horns it seems apparent the 2397 horns sound better with 2" drivers rather than 1". I also ran across an interesting statement from Earl K in this thread:
    http://audioheritage.org/vbulletin/s...highlight=2397
    that one possible reason is the height between the bells may need to be about .5 of the horn mouth.
    Has anyone tried retaining the original 2397 dimensions, but reducing the gap to 5/8 or so? Could this retain the 800hz size, but still give good results?

  13. #28
    Super Moderator yggdrasil's Avatar
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    Reducing the gap, keeping all other dimensions, will increase the crossover frequency. At least according to Smith's formulas.
    Johnny Haugen Sørgård

  14. #29
    Super Moderator yggdrasil's Avatar
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    Smith calculations.
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    Johnny Haugen Sørgård

  15. #30
    Senior Member Michael Smith's Avatar
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    Smith-Johnny Horns

    Well done I'm in.
    Will be starting my prototypes next week and I will post pics of my progress,wooden horns have always had a sensual simpatico for me, getting alittle wood just thinking about it.

    Michael

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