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Thread: 4301B Crossover Rebuild

  1. #31
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    BTW, anyone ever compared the L19/19A and 4301/4301B directly and what about changing over the L19 to the 4301B crossover? Even though they have a slightly different crossover and cabinet dimensions, I recall JBL stated the L19 was an acoustic equivalent to the 4301.

    Can anyone confirm these thoughts?
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

  2. #32
    Senior Member grumpy's Avatar
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    I have L19 and 4301B examples... main diff is cabinet depth (greater on 4301B) and height (shorter on 4301B).
    I mostly like the way the 4301 sized cab -looks- especially on a stand (chunkier, lower center of mass looking)...
    L19 might fit better on a shallow shelf or closer to a wall. 4301 looks nice all around (IMO). Quite likely typical placement
    and usage were taken into consideration for each design. I've not done a direct comparison... I'm thinking this would
    not be particularly helpful unless the intended environment were included. I can fire them both up if you'd
    like to give them a listen some time...

  3. #33
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    So here I am doing some research on my L16's and wanting to know the difference between them and the L19's and 4301's that I enjoyed so much when I borrowed them. Who's going to run it all down for me? Zilch that's who.

    My god I miss that guy.

  4. #34
    Junior Member fabrice11's Avatar
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    here is the update of my crossover with replacement L-PAD chemical polypropylene capacitors with SCR and Mundorf LE26 biased and also ceramic resistors by MOX
    Attached Images Attached Images  
    - JBL- Westlake Audio -

  5. #35
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    Anyone knows complete part number ot this?

    This project looks really interesting. I want to build a new crossover.
    Anyone knows the complete part list? I'm a newbie in electric engineering.

    Have some basic soldering skill but yeah...

    I'm searching Dayton capacitors, but I don't have any idea what I need.
    All links are dead because they're too old.

    After reading this post, it seems I'll need a 4.3 uF, 2.7 uF, 15 uF, 1.5 uF, and 2 of AudioCap Theta 0.01 uF 600v for building one crossover, total 6. But I don't have know spec of L-pad(?). I'll need a new breadboard and 3 things I don't know the name. Two are inductor(coil) I guess?

    Anyone knows more specific information?
    Capacitor shows several options such as voltage rating and tolerance.
    Which one is the correct part? 250v with 5% tolerance?

  6. #36
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    Quote Originally Posted by bbug View Post
    This project looks really interesting. I want to build a new crossover.
    Anyone knows the complete part list? I'm a newbie in electric engineering.

    Have some basic soldering skill but yeah...

    I'm searching Dayton capacitors, but I don't have any idea what I need.
    All links are dead because they're too old.

    After reading this post, it seems I'll need a 4.3 uF, 2.7 uF, 15 uF, 1.5 uF, and 2 of AudioCap Theta 0.01 uF 600v for building one crossover, total 6. But I don't have know spec of L-pad(?). I'll need a new breadboard and 3 things I don't know the name. Two are inductor(coil) I guess?

    Anyone knows more specific information?
    Capacitor shows several options such as voltage rating and tolerance.
    Which one is the correct part? 250v with 5% tolerance?
    For what model?
    What's wrong with the L-pads you have? The inductors?

    Thomas

  7. #37
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    Need a information for making a new JBL 4301B crossover.

    Still can't find spec of coils (inductors).

    I want to make a new crossover because I want to keep the original crossover.

    My L-pad is fine but just looking for a new replacement for the job.

  8. #38
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    Quote Originally Posted by bbug View Post
    Need a information about making a new JBL 4301B crossover.

    Still can't find spec of coils (inductors).

    I want to make a new crossover because I want to keep the original crossover.

    My L-pad is fine but just looking for a new replacement for the job.
    The original circuit diagram in the first post indicates 1.2mH and 0.4mH inductors. If you have the original crossovers, it would be a simple matter of determining which is which, then lift one end from circuit and measure the DC resistance of each inductor. That pretty much gives you the parameters of each coil, aside from maximum power. But you should then be able to find from the various speaker parts suppliers some options in air core, ferrite/metal cored inductors from US or UK sources that match the DCR and mH values. Practically all of them will probably handle at least 50W or more power. The only issue with air core will be size constraints which may not be an issue if you're building on a new board.

    Good luck!
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

  9. #39
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    Quote Originally Posted by mech986 View Post
    The original circuit diagram in the first post indicates 1.2mH and 0.4mH inductors. If you have the original crossovers, it would be a simple matter of determining which is which, then lift one end from circuit and measure the DC resistance of each inductor. That pretty much gives you the parameters of each coil, aside from maximum power. But you should then be able to find from the various speaker parts suppliers some options in air core, ferrite/metal cored inductors from US or UK sources that match the DCR and mH values. Practically all of them will probably handle at least 50W or more power. The only issue with air core will be size constraints which may not be an issue if you're building on a new board.

    Good luck!
    Thanks for the explanation! Now I can see something. haha.
    (Actually I didn't know anything about rebuilding a crossover, just a brief idea. I just gathered information and read them a lot.)

    I have extra crossover so I believe I can test and play with it.
    If I have just one more crossover, I might be happy with replacing the caps but..mmm.

    Air core, ferrite/metal cored inductors? Okay, I believe I need to study about them too.
    I don't know where but I read warning about replacing inductors. Mmm. And size of the inductor doesn't matter. Got it.

    Thanks again! I'll do more research.

  10. #40
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    bbug, you're welcome. If for some reason you needed another 4301 or L19 crossover, let me know, I've a couple extra I think.

    Also, if you live in The Angeles, like Los Angeles, we're not far apart, I'm in northern Orange County. Lots of LH members in the SoCal area.
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

  11. #41
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    Might need a crossover.

    Quote Originally Posted by mech986 View Post
    bbug, you're welcome. If for some reason you needed another 4301 or L19 crossover, let me know, I've a couple extra I think.

    Also, if you live in The Angeles, like Los Angeles, we're not far apart, I'm in northern Orange County. Lots of LH members in the SoCal area.
    SoCal area? Wow, I live near Los Angeles too. Don't know much about the SoCal area, though.

    My two 4301Bs are in shop for checking and refoaming.
    For now, I'm not sure, but I might need one of your 4301B crossover soon. =)

    I'll let you know.

    Thanks!

  12. #42
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    no problem, let me know.

    Which city or locale do you live in? If not from the area, where did you move from or spent the most time in?
    When faced with another JBL find, Good mech986 says , JBL Fan mech986 says

  13. #43
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    Want to buy a 4301B crossover.

    Quote Originally Posted by mech986 View Post
    no problem, let me know.

    Which city or locale do you live in? If not from the area, where did you move from or spent the most time in?
    I need a 4301B crossover asap. Let me know the price.

  14. #44
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    im sorry to butt in, im from temecula! and i need help building a 3 way network maybe 4333...please help the newbie out...does Zilch make crossovers?
    Semper Fidelis

  15. #45
    Senior Member grumpy's Avatar
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    Zilch will be unlikely to provide any physical help. It has been some years since his passing.

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