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Thread: 4345 4355 networks

  1. #31
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    I never use their automated ordering process. I think a few others have tried and gotten the same outrageous shipping amounts. Just email them with your order and your shipping address. They should respond with a quote in a day or two.

  2. #32
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    4345 network

    Hi all, and many thanks for your great job in this forum.

    regarding this post
    http://www.audioheritage.org/vbullet...1&d=1146736401

    external crossover should really have a 18db/oct slope? sometimes I've found sometimes a 12db/oct value .....

    thanks,

    ago

  3. #33
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    im back

    Been in hospital for the last 3 months looking forward to get back to this project when I'm able !

  4. #34
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    Help

    Quote Originally Posted by Earl K View Post
    > Hmm, forgot about that thread ( thanks Paul ) ~

    > Here's the network from that thread ( maybe it's not final / it is missing the Lpads );

    I

    Some Voltage Drives ;



    Pic with Lpads in place ( showing impedance stabilizing coils ) ;







    I am finishing up my 3155 cc networks \ I have 2 questions \ 1 hooking up the Lpads does the terminal 3 go to crossover and terminal 2 go to the driver and terminal 1 go ground / as in the 4344 MK ll networks ? question 2 - is the EQ for the 2202-2441-2405 used [ N4 N5 N6 K4 K5 K6 } if so is it both the K and N - and what would the value be ? the 2202 is replaced with the 2123H as what 4313B did .... thanks for any help

  5. #35
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    Quote Originally Posted by kartsmart View Post
    I am finishing up my 3155 cc networks \ I have 2 questions \ 1 hooking up the Lpads does the terminal 3 go to crossover and terminal 2 go to the driver and terminal 1 go ground / as in the 4344 MK ll networks ?
    Yes.

    Quote Originally Posted by kartsmart View Post
    question 2 - is the EQ for the 2202-2441-2405 used [ N4 N5 N6 K4 K5 K6 } if so is it both the K and N - and what would the value be ?
    Those are just labels. They mean nothing. EQ was my notation for "Equivalent". N4, N5, N6 are nodes for voltage drives in LEAP.

    Everything in that schematic including and to the right of S6 and S8 is nothing to concern yourself with. Just replace all that stuff with normal L-Pads. It looks like the L-Pad on the 2441 is supposed to be 16 ohms and the L-Pad on the 2405 is supposed to be 8 ohms.

  6. #36
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    Thank You thank you

    Thanks for your time to answer my questions , hopefully i will get these done , I had one of the worst years of my life !!! once again Thanks !!!

  7. #37
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    polarity question

    Quote Originally Posted by 4313B View Post
    Yes.

    Those are just labels. They mean nothing. EQ was my notation for "Equivalent". N4, N5, N6 are nodes for voltage drives in LEAP.

    Everything in that schematic including and to the right of S6 and S8 is nothing to concern yourself with. Just replace all that stuff with normal L-Pads. It looks like the L-Pad on the 2441 is supposed to be 16 ohms and the L-Pad on the 2405 is supposed to be 8 ohms.

    just would like to check - what would the the polarity connections be for the drivers / 2123H 2441 2405 / and biamped 2245

  8. #38
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    not sure ?

    Im guessing + to black for 2123 2241 2404 ?

  9. #39
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    I give up

    i give . please what is the answer

  10. #40
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    Quote Originally Posted by kartsmart View Post
    Im guessing + to black for 2123 2241 2404 ?
    I Googled 'JBL 3145', went to their website and it looks like they did just that on the top three transducers.

    http://www.jblproservice.com/pdf/net...45 network.pdf

  11. #41
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    Old thread but might help people building these nowdays, I have build both networks, the one with and the one without coils, The one without did every thing perfect except that it has some harsness in the vocal range ÷n the 2" driver if you have a huge choir . On the other hand the non coiled version seems a litle bit more dynamic and open to me. So I personaly feel, for slam take the non coil'd and for accuracy the coiled.

  12. #42
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    Yes Hans, it's still very helpful. A thread may be old but as long as there are people using big vintage 43's any info is appreciated
    I bought a pair of 2123H (Sorry, no more stock looking 4343 ) which I hope to receive at the end of this week and thus with the 2123H and 2441's I won't be able to use Giskard's 4344MkII networks but instead I need the 4355 ones.

    What kind of "2 did you use, the 2446 with Ti dia's?
    Currently: JBL 4343 (4353?) with 2235H/2123H/2441/2405 and 4312MKII (for sale)
    The Dutch JBL fanatic

  13. #43
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    2445 with Aquaplas , 2446 somehow doesn't fit in, I cant explain why but 2445 is way better sounding in this combination. Doesnt matter what membames I use btw, Ribd Flat or Aqua, aways the same difference.

  14. #44
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    Quote Originally Posted by Hans Bleeker View Post
    Old thread but might help people building these nowdays, I have build both networks, the one with and the one without coils, The one without did every thing perfect except that it has some harsness in the vocal range ÷n the 2" driver if you have a huge choir . On the other hand the non coiled version seems a litle bit more dynamic and open to me. So I personaly feel, for slam take the non coil'd and for accuracy the coiled.


    2445 with Aquaplas , 2446 somehow doesn't fit in, I cant explain why but 2445 is way better sounding in this combination. Doesnt matter what membames I use btw, Ribd Flat or Aqua, aways the same difference.
    Hi Hans Bleeker,
    You said "coils", are there "Zobel impedance compensating coils" or something else?
    Can you show the networks schematics?

    Do you use 2311/2308 horn-lenses combo, or some others?...

    As I have remembered 2445 driver with some other horns, not 2311 can produce narrow, but deep notch around 10kHz.

    http://www.audioheritage.org/vbullet...l=1#post345210

    http://www.audioheritage.org/vbullet...l=1#post350117

    while 2450 (I think very very similar to 2446) has not such behavior

    http://www.audioheritage.org/vbullet...l=1#post353522


    Regards
    Ivica

  15. #45
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    Quote Originally Posted by ivica View Post
    Hi Hans Bleeker,
    You said "coils", are there "Zobel impedance compensating coils" or something else?
    Can you show the networks schematics?

    Do you use 2311/2308 horn-lenses combo, or some others?...

    As I have remembered 2445 driver with some other horns, not 2311 can produce narrow, but deep notch around 10kHz.


    Regards
    Ivica
    I ment the inductors as you can see in one of the schematics in this post, 4313 made that network without the replacement inductors for the tapped transformer, I use the drivers as in these schematics as in this post, so with a 2405 on top from 10Khz.
    Its not the frequentie response, it has to do with soundstage, the soundstage is what ever horn I use , deeper and more coherent with the 2445 then with the 2446, its a small difference but noticable. Sinds the 46 has a different phase plug I'm not even that amazed about that happening.
    Although the 2446 is more cleaner , so im now in the position where I change every week between them because I cant choose

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