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Thread: A JBL L300 DIY Project

  1. #1
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    A JBL L300 DIY Project

    Hello friends,

    I am currently working on building an L300 speaker using Nelson Pass xo. I have already ordered the cross-over parts from the Madisound online. I am want to make a cabinet like this:

    https://www.yoycart.com/Product/534163460324/

    And install the tweeter on top of it. I am going the make an 5 cubic feet volume for the 2235H's and tune it to 30Hz (by two 4" x 11" ports).

    The only problemI have is the horn. I have the short 2307 horn (which works for the 4-way version). Is there any other horn (like the one in the picture above) that works fine with the xo using the 2420 driver. I cannot find the 2312 anyway... Is there any solution for this?

    Any help is greatly appreciated, as I am kinda excited and want to build this speaker as soon as possible.
    I will post photos as I start building the speaker cabinets.

    thanks

  2. #2
    Senior Member SEAWOLF97's Avatar
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    Quote Originally Posted by Thomee View Post
    I am want to make a cabinet like this:

    https://www.yoycart.com/Product/534163460324/
    Speaker type:
    Front

    Sensitivity:
    93dB mW

    Power:
    200W

    Brand:
    I love you.


    Model number:
    HORN-2 15

    Impedance:
    8.


    Those are great speakers you have, what kind are they ??

    I love you

    yes,yes..we'll talk about that later....but what kind are they ??


    sorry, sometimes the Chinese forays into English are funny.
    “If you think that’s the dumbest thing you’ve ever heard,
    just wait a couple minutes!”

  3. #3
    Administrator Mr. Widget's Avatar
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    Thanks for sharing.

    I have been looking for "Front Type" loudspeakers. They have been very difficult to find.


    Widget

  4. #4
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    Well Thomee, the good news that passive components are flexible ( from the perspective that one can alter their values by adding additional parts to them ).

    So ( no matter what ) you really won't be out of pocket if it takes forever to locate a pair of 2312 horns.

    As you likely guessed, the Nelson Pass network is unique and only usable on a real L300 ( as is any custom network ).

    My recommendation would be to buy a pair of Altec 811 or 511 horns ( on the used market ).

    The 2420/le85 plays nicely on those horns ( according to Zilch ).



    At least the Altec are deep horns ( compared to all the latest crop of wave-guides that are at the very most, half the depth ).

    A similar depth horn means the values of the passive components have a better chance of being useful in a working crossover for those radials/sectoral.

    Also, I'm also pretty bullish on this ZXPC BiRadial sold here ( click the pic ).
    - though it requires some modelling-clay work to fix it's flare-rate problems.


    They need about a 1/2 lb of plumbers putty smoothed into the throat section to be usable > but once that's done a person can get a solid 750hz out of this horn when driven by a JBL 2425/6/7 driver.



    Your 2420 would need an adapter to make it into screw-on to mate to the ZXPC ( which wouldn't be the end of the world sonically ).

    Getting an Altec Radial ( or the ZXPC mentioned above ) would put you a step closer to the setup seen in your pic ( which was meant to be a TAD 4001 on a TH4001 > or should be ).

    Name:  TB2fzsLqFXXXXaHXpXXXXXXXXXX_!!109709525.jpg
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  5. #5
    Senior Member macaroonie's Avatar
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    My 50c worth.

    You propose to use 2235 h woofer for your project. JBL did in fact spec the 2235h as a suitable drop in replacement for the original driver (2231 from fading memory ) .
    Please be aware that the 2235 is pretty much a sub woofer with a good response down to 20 Hz. This is achieved with the addition of a mass ring of 30 gms installed under the dust cap internal to the voice coil former.
    While this achieves it's aims as always it comes at a price, a drop in efficiency and a loss of useable response at the top end.
    The sonic signature in the 400 to 800 Hz octave becomes somewhat dark / muddy / thick. etc. It is of course unreasonable to expect 30g of dead weight on the speaker cone to be as clear and agile as a hf diaphragm weighing considerably less.
    From personal experience a X/O in the 600 Hz region yields much greater clarity and solid imaging.
    This of course can not be done with 2420 etc
    on the conical horn . 800 is pretty much as low as you can go.
    The solution is to aim for 500hz if you can find a horn +driver combo that will play well in that region. To that end you will need a large format driver and a suitable horn.
    In my homebrew I opted for a B&C 2inch exit driver on a JBL 2380 horn
    Using an active network it quickly becomes apparent that the 2235 just will not play well at 800

    Best of luck with your project

  6. #6
    Senior Member SEAWOLF97's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    Thanks for sharing.

    I have been looking for "Front Type" loudspeakers. They have been very difficult to find.


    Widget
    looks like they are sold out Mabye Mr. W bought the last 4 units. ??

    Sorry ,this product is not sell anymore.
    (It is out of date or link error. Most likely, the seller no longer sells this product .)


    when I looked at the page yesterday, the price was approx $4,500US EACH . for the price of a single, you could have bought a pair of real JBL L-300's


    Quote Originally Posted by macaroonie View Post
    In my homebrew I opted for a ....
    would like to hear them someday.
    “If you think that’s the dumbest thing you’ve ever heard,
    just wait a couple minutes!”

  7. #7
    Senior Member DavidF's Avatar
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    Discount of $1.81 each if 11 or more units are purchased. Group buy! Anyone?
    David F
    San Jose

  8. #8
    Senior Member SEAWOLF97's Avatar
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    Quote Originally Posted by DavidF View Post
    Discount of $1.81 each if 11 or more units are purchased. Group buy! Anyone?
    back to 99 available.

    I'm no expert , but this is a 2235h ?

    HIEND high-end fever 15-inch rotorcraft horn speaker imported JBL original driver 2235h bass genuine
    Attached Images Attached Images  
    “If you think that’s the dumbest thing you’ve ever heard,
    just wait a couple minutes!”

  9. #9
    Senior Member ivica's Avatar
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    Quote Originally Posted by Thomee View Post
    Hello friends,

    I am currently working on building an L300 speaker using Nelson Pass xo.

    The only problemI have is the horn. I have the short 2307 horn (which works for the 4-way version). Is there any other horn (like the one in the picture above) that works fine with the xo using the 2420 driver. I cannot find the 2312 anyway... Is there any solution for this?

    Any help is greatly appreciated, as I am kinda excited and want to build this speaker as soon as possible.
    I will post photos as I start building the speaker cabinets.

    thanks
    Hi Thomee,

    Have You tried SELENIUM HL-14-25 (1"-throat horn), seems very similar to the JBL 2312, You are looking for

    https://www.jblpro.com/ProductAttach..._SpecSheet.pdf

    regards
    ivica

  10. #10
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    Quote Originally Posted by SEAWOLF97 View Post
    back to 99 available.

    I'm no expert , but this is a 2235h ?

    HIEND high-end fever 15-inch rotorcraft horn speaker imported JBL original driver 2235h bass genuine

    LOL!! You’re kidding don’t you!!!

  11. #11
    Senior Member martin_wu99's Avatar
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    Quote Originally Posted by SEAWOLF97 View Post
    Speaker type:
    Front

    Sensitivity:
    93dB mW

    Power:
    200W

    Brand:
    I love you.


    Model number:
    HORN-2 15

    Impedance:
    8.


    Those are great speakers you have, what kind are they ??

    I love you

    yes,yes..we'll talk about that later....but what kind are they ??


    sorry, sometimes the Chinese forays into English are funny.
    Bond,LOL!you are kidding
    They said they developed woofer by themselves directly from JBL 2235H and ATC SB100-375,the tweeter is SELENIUM 408Ti,cab is TAD 2402,brand is NBM(nothing but music)
    Not bad,but i think the price is too expensive
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    46 lover

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