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  1. #441
    Founding Wammer jonjin's Avatar
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    Post imported post

    10uF Mundorf Supreme... exactly the same as before... I seem to be happy with 1uf on my tweets, haven't yet played with a 2uF.

  2. #442
    . murray johnson's Avatar
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    10uF is more like it for 1kHz


    & this is with the Stereolab horns?

    what are you having to use to attenuate the S2 & tweeter? Wirewounds do slug the hf. I was quite shocked by traces I ran with & without L-Pad attenuation

  3. #443
    Founding Wammer jonjin's Avatar
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    murray johnson wrote:
    10uF is more like it for 1kHz


    & this is with the Stereolab horns?

    what are you having to use to attenuate the S2 & tweeter? Wirewounds do slug the hf. I was quite shocked by traces I ran with & without L-Pad attenuation
    On the S2 - 9dB l-pad with Duelunds. Standard resistors on the tweeter. I'm deaf above 14kHz anyways

    edit-you'll just have to come and listen!

    edit2-Sterelabs as the Azuras won't fit... unfortunately. The Azuras do blend better.

  4. #444
    Wannabe dealer i_should_coco's Avatar
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    Post imported post

    Is it the source impedance of the LPAD? Or just the inductance? Have you measured how inductive they are?
    CD players - computer audio for dummies.

  5. #445
    Founding Wammer jonjin's Avatar
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    I post this here as it parallel's my experience and provides a recipe for people wanting to build a horn system using modern drivers at a very reasonable cost. Also very well written with all the technical measurements.

    http://www.audiodesignguide.com/HiEff/HiEff.html

  6. #446
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    Dismantling? What happened?

  7. #447
    Super Wammer paulf-2007's Avatar
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    Hi JJ, very useful link. I put together some open baffles and at present run 15" woofers with a 130w rotel amp and 8" full range drivers with 2A3 mono's. At JVS ( jims ) bake off it was agreed that there was cone break up from the 8" drivers and adam ( amdismal ) suggested limiting the 8" drivers frequency range to give it less to do. I decided to cut it off at 3000hz and have been looking at compression drivers and horns to cover from 3000hz upwards. It looks like there is an affordable way forward with the BMS drivers and tractrix horns on the stereo labs site.
    Quote Originally Posted by jonjin View Post
    I post this here as it parallel's my experience and provides a recipe for people wanting to build a horn system using modern drivers at a very reasonable cost. Also very well written with all the technical measurements.

    http://www.audiodesignguide.com/HiEff/HiEff.html

  8. #448
    Founding Wammer jonjin's Avatar
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    Exploring options for 150Hz horns. Not many people make them. I'll update very slowly...

    http://www.autotech.pl/pdf/audio_en.pdf
    http://www.bentwoodhorns.com/
    http://www.stereo-lab.de/EN/spheric-...rns/index.html
    and Azura of course (where this all started)

    http://www.bcae1.com/xoorder.htm
    http://sound.westhost.com/lr-passive.htm
    Last edited by jonjin; 13-11-2010 at 11:04 PM.

  9. #449
    Founding Wammer jonjin's Avatar
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    Talking Christmas comes early to chez JJ

    RCA 9448 - 1.4" throat











    Last edited by jonjin; 30-10-2010 at 09:07 AM.

  10. #450
    Wannabe dealer i_should_coco's Avatar
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    Ooooh! Either that's a "children's" size cigar, or them are very big.
    CD players - computer audio for dummies.

  11. #451
    . murray johnson's Avatar
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    Can't wait to hear how that goes. What's the plan re horns to attach to them?

  12. #452
    Founding Wammer jonjin's Avatar
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    Quote Originally Posted by i_should_coco View Post
    Ooooh! Either that's a "children's" size cigar, or them are very big.
    Them are big mama Cohiba cigar!

    Quote Originally Posted by murray johnson View Post
    Can't wait to hear how that goes. What's the plan re horns to attach to them?
    No definitely plans yet. Still trying to find a 150Hz horn. Coco might have one spare
    But this will be a far in the future project as the room is too small. It will be a 4-way:

    tweeter
    S2 down to 1kHz
    9448 200-1kHz
    probly folded bass horn

    JJ

  13. #453
    Leper Wammer AmDismal's Avatar
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    WTF - a cigar?!?! Jeez man, haven't you got something that is actually a practical way of illustrating scale - like a ruler?!? A CD?!?!? You're a doctor, for crying out loud!?!?

    Cool though
    Compression drivers twerk my eardrums

  14. #454
    . murray johnson's Avatar
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    Quote Originally Posted by jonjin View Post
    Them are big mama Cohiba cigar!



    No definitely plans yet. Still trying to find a 150Hz horn. Coco might have one spare
    But this will be a far in the future project as the room is too small. It will be a 4-way:

    tweeter
    S2 down to 1kHz
    9448 200-1kHz
    probly folded bass horn
    JJ
    Poof!

  15. #455
    Founding Wammer jonjin's Avatar
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    Quote Originally Posted by murray johnson View Post
    Poof!
    LOLOLOLOLOLOLOLOL



    Just tested the pair and thank gd they both sound clean and healthy.

    edit, Adam, cigar is 18 cm long...
    Last edited by jonjin; 30-10-2010 at 02:33 PM.

  16. #456
    Wannabe dealer i_should_coco's Avatar
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    Quote Originally Posted by jonjin View Post
    edit, Adam, my cigar is 18 cm long...
    No need to brag.
    CD players - computer audio for dummies.

  17. #457
    Up the hammers ADPully's Avatar
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    Nice one JJ with the RCA's and the hamlet moment - Hopefully I will have something 7" diameter to show you in a few weeks.
    Ipod Pure I-20; Jolida DAC, Transcendent SE OTL; Ultracurve digital cross over and disco amp for bass, Speakers DIY 3 way Open Baffle, Hawthorne 15"Augie, Audio Nirvana, PHY 8"er or Fostex FF225K and RAAL 140-15D and a DIY deck Trans-fi based

  18. #458
    Wannabe dealer i_should_coco's Avatar
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    So, you wanna get some 1.4" to 1.5" throat adapter made up then?
    CD players - computer audio for dummies.

  19. #459
    Founding Wammer jonjin's Avatar
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    Quote Originally Posted by i_should_coco View Post
    So, you wanna get some 1.4" to 1.5" throat adapter made up then?
    Ok boss

    edit to add spiel from ebay...
    Here we have a rare pair of RCA MI-9448 permanent magnet theatre compression drivers. As I understand the RCA models, the 9448 was produced from immediately after World War II until approximately 1950 when it was replaced by the MI-9458. I do not know what the differences are between the 9448 and 9458; the examples I have seen of both feature the same diaphragm and drilled hole pepper pot phasing plug. These units, like the WWII-era drivers produced by RCA for the U.S. Navy, featured a larger, heavier magnet structure compared to the later 9458 series. In the mid or late 1950s the 9458 series debuted, and carried the RCA theatre systems through the 1970s in A, B and C versions.
    Last edited by jonjin; 27-12-2010 at 09:48 PM.

  20. #460
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    Jonjin
    You "box" is full and cant be sent messages. Please empty so I can send you a message about 9448's thanks

    cheers
    Alan

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