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Thread: 4345 4355 networks

  1. #16
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    I thought I'd posted my final 4355 equivalent schematic. I'll have to look through my LEAP files and find it again.

  2. #17
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    Quote Originally Posted by 4313B View Post
    I thought I'd posted my final 4355 equivalent schematic. I'll have to look through my LEAP files and find it again.
    Thank you VERY much!
    2ch: Oppo, JoLida 502CRC, JBL L212, 18ti,240ti; Heath AS101, Von Schweikert VR4
    7.1: Oppo BDP103D, B&K, UREI 809A, JBL B460

  3. #18
    Senior Member Uncle Paul's Avatar
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    Quote Originally Posted by 4313B View Post
    I thought I'd posted my final 4355 equivalent schematic. I'll have to look through my LEAP files and find it again.

    This is by any chance? http://www.audioheritage.org/vbullet...l=1#post292188

    Dammit, reading through that thread again gives me crazy ideas...
    "Zobel is as zobel does"

  4. #19
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    > Hmm, forgot about that thread ( thanks Paul ) ~

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



    Some Voltage Drives ;



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

    Quote Originally Posted by Giskard
    The second photo shows the L-Pad board with the 3.5 mH 7.5 ohm and 1.0 mH 7.5 ohm inductors.
    16 ohm L-Pad in front of the 376/2441/2445J (instead of the R13, R14, R15 sim)
    8 ohm L-Pad in front of the 077/2405 (instead of the R10, R11, R12 sim)





  5. #20
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    impedance stabilizing coils

    How does an impedance stabilizing coil work when connects to the L-Pad?
    What value do you use?
    How do you connect to the L-Pad?

  6. #21
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    How does an impedance stabilizing coil work when connects to the L-Pad?
    What value do you use?
    How do you connect to the L-Pad?
    > Think of it as a reverse Zobel circuit .

    > So rather than flattening an impedance curve as frequency increases / it flattens ( an impedance curve ) as the frequency decreases .

    > I believe Giskard has them wired directly across the drivers' 2 terminals .

    > The Lpad was most likely just a convenient "standin" for the drivers own terminals ( "parallel is still parallel" , at either end of the wire ) .

    > Values are dictated in the same manner that a Zobels values are dictated .


  7. #22
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    So I am confused what print is the right one ?

  8. #23
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    "what print is the right one ?"

    > I'd go with a build-up of the 2010 version ( including the previously mentioned Lpads ) .


  9. #24
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    Yep, that's the one. Thanks for finding it.

    R10, R11, R12 and R13, R14, R15 simulate real L-Pads. Just use L-Pads instead of those resistors. 16 ohm L-Pad on the 2441 and 8 ohm L-Pad on the 2405.


    The L-Pad board in the photo above was for the 4344 MkII network that I also tried. The compression driver has the 1.0 mH 7.5 ohm DCR coil across its terminals and the 2123H has the 3.5 mH 7.5 ohm DCR coil across its terminals as per Greg's schematic.

    Listening to the 4344 Mk II network side by side with the 4355 network I personally preferred the 4355 network, greater power and dynamics, which is what I expect from such a large loudspeaker.

    The 4344 MK II networks are now in saeman's personal pair of 4344's. They really were intended for the single fifteen-inch based system. Turning all the L-Pads up 2 dB for the 2245H or 3 dB for the dual 2235H's didn't really cut it.

  10. #25
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    Those voltage drives are from Greg's designs in the early 80's. One is of the stock 4345 (April 1981), the other two are from the two different versions of the 4355 (May 1981 and September 1981, reshape of the 2441 drive).

  11. #26
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    > This is the network I believe you should build up, if you want to copy Giskards super build ( just be aware that it was biamp only ).
    Interestingly, most people want full passive networks rather than bi-amp only networks. It is more convenient I suppose.

  12. #27
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    Just checking before ordering parts L4 470u is the same as .47mh ?

  13. #28
    Senior Member Baron030's Avatar
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    Hi Kartsmart
    470u is 470 micro-henries, which is equal to 0.47 milli-henries.
    So, you are correct. Good luck with your project.
    Baron030

  14. #29
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    Yes. They should all be standard Solen parts orderable from their website. I usually just shoot them an email and then call Dominique with my credit card number after she responds that everything is in stock.

  15. #30
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    Shipping ??

    Went to order part from solen everything seemed good until the shipping charges was applied, $163.00 can this be right ? E-mailed them but no reply. This will sure put this project over budget

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