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Thread: DIY "4345" Project

  1. #16
    Senior Member spkrman57's Avatar
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    Question for 4313B

    I did not want to quote the entire post, but this caught my attention in your thread starter:

    " 2445J/2311/L94 with D8R2452H-SL diaphragms"

    The question I have for you is:

    With the 2452 diaphrams in the 2445 (which I'm guessing are aquaplased), how good can the 2445's sound. I'm sure fellow member "Cosmos" would be interested in that info also!

    Thanks, Ron
    JBL Pro for home use!

  2. #17
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    L-Pad Knobs

    4313B (or anyone else),

    Where are you [guys] obtaining the knobs for the L-Pads. The ones supplied with the L-Pads at Parts Express are certainly not the ones that many of the forums members are using in their DIY 43XX builds.

    Please let me know.

    Thanks,
    Dhar

  3. #18
    Senior Member Fangio's Avatar
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    Quote Originally Posted by dkalsi View Post
    ... Where are you [guys] obtaining the knobs for the L-Pads. The ones supplied with the L-Pads at Parts Express are certainly not the ones that many of the forums members are using in their DIY 43XX builds.
    Got some here, for my networks:

    sign--shop

    http://audioheritage.org/vbulletin/showthread.php?t=18085&page=2


  4. #19
    Junior Member Cosmo's Avatar
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    Those look very nice

    Nice job !!! Very clean looking you do nice work !!!

  5. #20
    Senior Member Fangio's Avatar
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    If you mean the knobs, yes they are pretty but it's another member here who remakes them, rjtimmerman. He owns this sign--shop.
    Quote Originally Posted by Cosmo View Post
    Nice job !!! Very clean looking you do nice work !!!
    But if you were referring to 4313B's craftsmanship I couldn't agree more.

    Quote Originally Posted by boputnam View Post
    ... Can you share a pic of the pair, in their working position?
    , and
    Quote Originally Posted by 4313B View Post
    In any case, I'll be moving on to the 4345 equivalent networks with the 2122H's and 2421B's as well as 2445J's
    please keep us posted about your findings. Thanks

    Happy New Year everyone.

  6. #21
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    Quote Originally Posted by 4313B View Post
    In any case, I'll be moving on to the 4345 equivalent networks with the 2122H's and 2421B's as well as 2445J's in a few weeks after I get the rest of the 4355 networks out the door as promised.
    4313B,

    Have you had any luck finding time to start the new 4345 equivalent networks?

    Thanks,
    Dhar

  7. #22
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    Not yet. It's been a bad 4th quarter (funerals, massive layoffs and illnesses to live through). I've still got two pairs of 3155's sitting here looking at me. I can't believe it is already January 12th. I just lost a whole freakin' week.

  8. #23
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    Quote Originally Posted by 4313B View Post
    Not yet. It's been a bad 4th quarter (funerals, massive layoffs and illnesses to live through). I've still got two pairs of 3155's sitting here looking at me. I can't believe it is already January 12th. I just lost a whole freakin' week.
    Oh I'm sorry to hear that. Hopefully things will turn around with the new year.

    Best of luck :-)

    Dhar

  9. #24
    Senior Member JuniorJBL's Avatar
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    That sir is TOTL!!
    Always fun learning more.......

  10. #25
    Senior Member spkrman57's Avatar
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    Keep you chin up!

    Quote Originally Posted by 4313B View Post
    Not yet. It's been a bad 4th quarter (funerals, massive layoffs and illnesses to live through). I've still got two pairs of 3155's sitting here looking at me. I can't believe it is already January 12th. I just lost a whole freakin' week.
    Things will improve for 2010!

    Regards, Ron
    JBL Pro for home use!

  11. #26
    Senior Member Eaulive's Avatar
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    Quote Originally Posted by spkrman57 View Post
    Things will improve for 2010!

    Regards, Ron
    I hope so, 'cause in my case it could hardly be worse than 2009

  12. #27
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    I quick question about this design

    In this build, I noticed that you used the JBL 2123H driver as oppose to the 2122H driver.

    Now I can't remember which thread this was discussed in, but I believe it was previously discussed that the JBL 2245H does not perform well in the upper end of the 30Hz-300Hz specturm and that the JBL 2122H does a better job than the 2123H in the bottem end of the 300hz-1,200hz spectrum.

    I pulled up the spec sheet for JBL 2123H and found the frequency response of the 2123 to be 80hz to 6Khz. Hence, I see no reason to believe why the 2123H would not perform equally well as the 2122H.

    It could very well be that I may have misread something (or am just confusing myself). My question is: Besides the fact that JBL 2122H was originally used in the JBL 4345s, is there any reason to believe that it is better suited for the 4345 than the 2123?

    Thanks,
    D

  13. #28
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    Quote Originally Posted by dkalsi View Post
    In this build, I noticed that you used the JBL 2123H driver as oppose to the 2122H driver.
    So I could try out the 4344 Mk II network. It works.
    Quote Originally Posted by dkalsi View Post
    Now I can't remember which thread this was discussed in, but I believe it was previously discussed that the JBL 2245H does not perform well in the upper end of the 30Hz-300Hz specturm
    It does just fine. The room is probably the problem with any response in the upper end. You can cross the eighteen and the ten lower. It isn't written in stone that you have to cross over at 290Hz or 340Hz. Anything that works in the 200 to 400 Hz range in your room will do. I'm currently using 200 Hz (because my 4345's are right on the floor) and the 2123H is just slightly thin whereas the 2122H sounds real nice.
    Quote Originally Posted by dkalsi View Post
    and that the JBL 2122H does a better job than the 2123H in the bottem end of the 300hz-1,200hz spectrum.
    Yes it does as far as bandwidth goes. If I remember correctly the 2122H is about 1 dB more efficient at 300 Hz.
    Quote Originally Posted by dkalsi View Post
    I pulled up the spec sheet for JBL 2123H and found the frequency response of the 2123 to be 80hz to 6Khz. Hence, I see no reason to believe why the 2123H would not perform equally well as the 2122H.
    The "80 Hz spec" of the 2123 is based on the ported box. I've posted the response curves of both drivers in the ubiquitous sealed box and the 2122H has more bottom end.
    Quote Originally Posted by dkalsi View Post
    It could very well be that I may have misread something (or am just confusing myself). My question is: Besides the fact that JBL 2122H was originally used in the JBL 4345s, is there any reason to believe that it is better suited for the 4345 than the 2123?
    While I have no doubt at all that some people have swapped out a 2122 with a 2123 in a stock 4345 and proclaimed it a success the short story is "it won't work". And in real life it really doesn't work although I'm sure it is "good enough" for some folks and that's fine. The 2123 is 3 dB more efficient, has more top end and less bottom end than the 2122. Think "tilt". Account for that by reworking the stock 4344/4345 network and you should be good to go.

    Or you could just go digital and quad amp.

    My only beef with the 2122H is the foam surround. It's a very nice termination, arguably better than the 2123H rolled surround, but it will rot over time.

  14. #29
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    Thanks

    Thanks 4313B - for the thorough response.

    Hope all is well.
    D

  15. #30
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    4313B,

    You make a good point that they are not plug and play and the 2123 scores on the foam rot.

    I have heard both on the 4345 ..the 2122H with the stock 3145 network and the 2123 in the 4345 with the 4344mk11 network.

    Its a case of weighing up the bit of extra low end the 2122H has versus the extended response of the 2123 and how that is exploited with the 4344mk11 network.

    Both are really nice when properly setup and its horses for courses.

    Let your ears be the judge.

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