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Thread: 4333 / S300 / L300 equivalent bandbass circuit

  1. #16
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    "it also has a resistor in parallel with the woofer with a higher resistance than the resistor in parallel with the woofer in the S3100. What is the consequence of this other than a lower sensitivity in the latter case?"

    It helps to reduce the motional impedance of the transducer making the load a bit easier on a driving amplifier.

  2. #17
    Dang. Amateur speakerdave's Avatar
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    This is a very important thread for those interested in this group of speakers.
    Is it possible to change the title?
    Written as it is the search engine does not pick it up for the individual model numbers, and nowhere in the thread are any of those three model numbers mentioned individually. I think hyphens in place of the slashes would do it, or a space on each side of each slash. As it is now it is buried.

    Thanks

    David

  3. #18
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    Thumbs up

    Yea, I agree with Dave. Also, it could be entered into the reference section .

    And , the "S300" in the title ought to be fixed to read S3100 .

    Giskard, did you ever get a DCR value for the 1.0 mh coil in the highpass circuit for the S3100 ?

    Maybe Jan D ( or Bernard ) could measure it for us .
    - It should be quite high or else that series LC(r) across the driver , will create a huge notch filter.

    regards <. Earl K

  4. #19
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    I've asked Don to fix the title using spaces between the slashes.
    The S300 is the LCS version of the L300.

  5. #20
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    Originally posted by Earl K
    Giskard, did you ever get a DCR value for the 1.0 mh coil in the highpass circuit for the S3100 ?
    I want to say it's on the order of 6 to 8 ohms.

  6. #21
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    Originally posted by GordonW
    Whoa, man, Giskard... is that big HF notch filter/impedence "compensation" network connected to the input terminals of the cabinet there? What exactly does that do for the effective impedence of the whole cabinet?
    I believe it is supposed to "fix" it so one doesn't blow up an amp.

  7. #22
    Dang. Amateur speakerdave's Avatar
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    Originally posted by Giskard
    I've asked Don to fix the title using spaces between the slashes.
    Cool!

    Thanks,

    David

  8. #23
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    Originally posted by Earl K
    It should be quite high or else that series LC(r) across the driver , will create a huge notch filter.
    Did you try 6 to 8 ohms in your modelling software?

  9. #24
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    Modelling Software ?

    Hi Giskard,

    No, I haven't tried those dcr values.

    I don''t have any modelling software for designing "passives" . I'm not aware of any (spice) packages that run on Macs . Perhaps I just haven't looked hard enough.

    When one of G.T.s advanced designs tweaks my interest, I mockup the new circuit portion, measure it, audition it and dismantle the "project" .

    As to the real world implementation of series LCR traps, I have yet to pursue acquiring a practical/working knowledge . I'm still studying the effects of "broadband" damping from resistors and/or shunted inductors. So, LCR traps are a type of finessed tweak that I have yet to explore .

    <. Earl K

  10. #25
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    Series Capacitor Values in CC version of 3133 (MF)

    I've been pricing out a charge-coupled crossover for the 4333A and so have been looking closely at the component values for the first time. The charge-coupled pair for the series/blocking capacitor in the MF section is not symmetrical. Is this intentional? The original value is 16.5 uF, so a pair of 33's would do it, but one is labelled 39.

    (If someone can get in touch with Giskard on this, I'd appreciate it.)


    David

  11. #26
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    Hi Dave

    Quote Originally Posted by speakerdave
    (If someone can get in touch with Giskard on this, I'd appreciate it.)
    Sorry, can't help you there but ,,,,
    Quote Originally Posted by speakerdave
    I've been pricing out a charge-coupled crossover for the 4333A and so have been looking closely at the component values for the first time. The charge-coupled pair for the series/blocking capacitor in the MF section is not symmetrical. Is this intentional?
    - Symmetrical pairing of the two caps is not important. What is important, is the final net capacitance of the biased pair . In this case the series pair ( 33 uf & 39 uf ) equate to 17.875 uf which fullfill the 18 uf spec.. This value ( 18 uf ) is what Giskard worked out for his "Equivalent Bandpass" ( or ; lacking the autoformer ) .
    - By the looks of those values speced ; they were included because of their availability ( instead of two 36 uf caps ) .
    Quote Originally Posted by speakerdave
    The original value is 16.5 uF, so a pair of 33's would do it, but one is labelled 39.
    - You're correct ; to equate back to the original value of 16.5 uf as found in your original N3133 network ( with autoformer ) / a pair of biased 33uf caps would be used .


    Earl K
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  12. #27
    Dang. Amateur speakerdave's Avatar
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    OK, I was comparing it to the wrong circuit. Thanks, Earl.

    David

  13. #28
    Senior Member John W's Avatar
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    I built the tweeter/mid charge-coupled version for a 3-way project, it is working out very well.

    The capacitors are Axon, from http://www.zalytron.com. For the 36uf I used a 12uf and a 24uf in parallel.
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  14. #29
    Dang. Amateur speakerdave's Avatar
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    Cool. Thanks, John.

    David

  15. #30
    RIP 2011 Zilch's Avatar
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    O.K., so who's got the schematic for S3100 MkII?

    [This seems to be a dual-topic thread.]

    Gonna build a mini-Everest here....

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