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  1. #1
    Senior Member Ralf's Avatar
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    New Monitor Project : DIY 4438 Dual 18"

    I think at present about a possibility of achieving deepest frequencies, max. pressure and natural sound .
    I could be inspired from the 4435.

    Here is a first study with two 2242H, one 2234H and the 2344A/2426...
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    16 Hz can not be substituted

  2. #2
    dancing-dave
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    I can just hear that speaker going "WHUMP!"

  3. #3
    Super Moderator Hofmannhp's Avatar
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    4438

    Quote Originally Posted by Ralf
    ....with two 2242H, one 2234H and the 2344A/2426...
    Hi Ralf,

    nice idea.....but what's the job for the 2234? When crossing the woofer section to the 2344 with about 1 kHz, for my opinion the problem may be the 800 - 1kHz. I would prefer a 10" or 12" for the lower mids, with less cone distortion in this frequency area... think about to use a 2441 with a good horn and try to set the crossover frequency to the woofers to 700-800 Hz. An additional 2405 maybe also give a fine and "crispy" sound.

    (only my "1 cent")

    HP
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  4. #4
    Senior Member Ralf's Avatar
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    Quote Originally Posted by Hofmannhp
    Hi Ralf,

    nice idea.....but what's the job for the 2234? When crossing the woofer section to the 2344 with about 1 kHz, for my opinion the problem may be the 800 - 1kHz. I would prefer a 10" or 12" for the lower mids, with less cone distortion in this frequency area... think about to use a 2441 with a good horn and try to set the crossover frequency to the woofers to 700-800 Hz. An additional 2405 maybe also give a fine and "crispy" sound.

    (only my "1 cent")

    HP
    Hi Hans-Peter,

    I would cut off the both 2242 at 100 Hz or less. So it makes sense with an additional driver for the lower mids. Why you thing it`s a problem to cut the 2234H at 1k? it`s the same situation as in your 4435...
    16 Hz can not be substituted

  5. #5
    Senior Member Ralf's Avatar
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    What Horn????

    The 2344 isn`t available on the market. I have only one at the moment.

    Is it possible to get the new OASR horn? Driver should be 2417???

    Or what is with the 2451H? What horn could be used? Questions over questions...




    16 Hz can not be substituted

  6. #6
    TimG
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    I'm currently waiting for an adapter so I can measure the P Audio pseudo clone of the 2344 with a 2426H and should have results in about a week. I'll simulate a modified 4430 crossover to use it with my 2234H and I can post a schematic. The 2451 has a 1.5" throat so any of the horns used with the 2430 could be used with this driver. You can get a 2381 or 2383 horn directly from JBL to use with this driver http://www.jblproservice.com/pdf/Hor...%20List%20.pdf but it does not have response all the way to 20kHz. You would probably want to add a supertweeter above 10kHz. I also know where you can buy some barely used 2451s for $450.

  7. #7
    Senior Member Ralf's Avatar
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    Considerations

    ok. what we have now:

    2 x 2242H
    active Network for the 2242: modified 5235A with BX6 tuning

    1 x mid bass driver ??? Guido has suggested the 2123H?

    1 x 1,5" horn ??? maybe with 2451 neodymium driver

    1 x 2405 passive network starting from 10kHz


    @TimG: isn`t it that the 2344 clone is a 1,5" horn?

    @all: has anybody hear the OASR horn?
    What you think about this idea?
    16 Hz can not be substituted

  8. #8
    Super Moderator Hofmannhp's Avatar
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    4438

    [QUOTE=Ralf]...... Guido has suggested the 2123H?
    ......1 x 2405 passive network starting from 10kHz ....
    QUOTE]

    Hi Ralf,

    that sounds fine to me.....

    for my opinion the 2234 in your first assy has not very much to do in the frequency range it is built for and the 2123 can handle the lower mids a lot better. Congratulations for your decision to take an additional 2405 (in this frequency range also the 4435 needs assistance)

    HP

    (PS: next weekend (sat 7:00pm and sun from 2:00pm )we celebrate a small xmas fest in my garage, opened for all to come .....if you like, ...and please tell it to Guido)
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  9. #9
    RIP 2011 Zilch's Avatar
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    Mid-bass? 2206, of course. Gotta keep up with those dual 18's.

    I, too, am hoping Tim will find opportunity to try the 2344A clone with a 1.5" driver like the 2451 suggested. Does it provide any VHF extension?

    It is, indeed, 1.5", but adapts down to 1" for 2426.

    I KNOW y'all like the 2405 for UHF, but 2404 would be a better match for 2344 mids, no? The one occasion I have seen 4435 "enhanced" with a supplemental UHF drivers, that's what was used....

  10. #10
    Senior Member Guido's Avatar
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    Quote Originally Posted by Ralf
    ok. what we have now:

    2 x 2242H
    active Network for the 2242: modified 5235A with BX6 tuning

    1 x mid bass driver ??? Guido has suggested the 2123H?

    1 x 1,5" horn ??? maybe with 2451 neodymium driver

    1 x 2405 passive network starting from 10kHz


    @TimG: isn`t it that the 2344 clone is a 1,5" horn?

    @all: has anybody hear the OASR horn?
    What you think about this idea?
    Low Mid 2123H or 2012H

    1,5" PAudio PH-316 (2344 clone), see:
    http://www.audioheritage.org/vbullet...&highlight=316
    I would go with the 2430

    I would suggest only on active xover. Low mid, mid and high should be passive!

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