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Thread: JBL LN3 Project, *Official Thread

  1. #1
    Nightbrace
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    JBL LN3 Project, *Official Thread

    http://www.oldhifi.com/jblln3.jpg

    Here is a picture of the cabinets, they currently have quality Allied drivers in them right now. I have no way of finding out what drivers were originally in them, no one seems to know anything about these cabinets, so I have to come up with the best possible drivers for these cabinets from scratch.

    Tentatively I have decided to go with the LE25 tweeters and LE5-6 mids from a set of L-36's.

    For woofers, I have been told to go with 12" 2202H Professional Series woofers, but it has been brought to my attention that using the 12" 2203H Professional Series woofers would be a better choice.

    If neither of these drivers are suitable, what other JBL 12" driver would be an acceptable alternative to go with the tweeters and mids I am planning to use.

    Or to complicate things even further for me, would there be even better tweeters and mids that will fit in these cabinets than the ones I am considering??

    They are true floorstanding speakers, and the internal volume is around 2.0 Cu. Ft.

    Any and all comments would be greatly appreciated as this is my first JBL "project".

  2. #2
    Senior Member Lancer's Avatar
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    Those kind of look like old JBL EN3 enclosures...

    Standard complement was:
    124A / 124H / 2203A / 2203H
    LE5-2 / LE5H / 2105 / 2105H
    077 / 2405 / 2405H
    LX30

    What are the outside dimensions?

  3. #3
    Senior Member Lancer's Avatar
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    These drivers are no longer serviceable with parts from JBL.
    Too bad, because they were mighty fine drivers.
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  4. #4
    Nightbrace
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    Those 2203H's look like just what I need, but where to get them??

    The dimensions are 34T x 20L x 13D. They are LN3's for sure..

  5. #5
    dblaxter
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    need to ask a question

    hi lancer,
    i wonder if you could answer a question , in previous threads it was posted that the difference in the 2203h and the 121a/h(either or) was the mass ring , i beleive i found a source of a few 2203h kits which i want to recone a butchered 121a, done with an aftermaket kit , what a crime , if i do get the kit would you sell me the proper wieght mass ring , it would be a great help,

    if you or anyone else that might need a kit reads this, p.m. and i can discuss a possible package deal to maybe get a better deal , they are expensive , 300.00+ ea.

    lancer also maybe you would p.m me , i believe i may owe you something, funds , favor , etc.

  6. #6
    Senior Member Lancer's Avatar
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    Quote Originally Posted by Nightbrace
    Those 2203H's look like just what I need, but where to get them??

    The dimensions are 34T x 20L x 13D. They are LN3's for sure..
    They are hard to find. The 124H is the exact same driver as the 2203H, only the cosmetics are different. There are more 2203H's out there than 124H's.
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  7. #7
    Senior Member Lancer's Avatar
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    Quote Originally Posted by dblaxter
    hi lancer,
    i wonder if you could answer a question , in previous threads it was posted that the difference in the 2203h and the 121a/h(either or) was the mass ring , i beleive i found a source of a few 2203h kits which i want to recone a butchered 121a, done with an aftermaket kit , what a crime , if i do get the kit would you sell me the proper wieght mass ring , it would be a great help,

    if you or anyone else that might need a kit reads this, p.m. and i can discuss a possible package deal to maybe get a better deal , they are expensive , 300.00+ ea.

    lancer also maybe you would p.m me , i believe i may owe you something, funds , favor , etc.
    The C8R2203 recone kit is used to build a 124A/124H/2203A/2203H driver. That driver can be built from any 121A/121H/124A/124H/2202A/2202H/2203A/2203H/2204H core. NEVER use a C8R2203 kit to build a 121A or 121H. That would be wasting a great cone kit. The C8R2203 should only be used to build a 124A/124H/2203A/2203H. A 121A or 121H can be built with the C8R121A recone kit (still available) using any 121A/121H/124A/124H/2202A/2202H/2203A/2203H/2204H core. The C8R121A recone kit differs from the C8R2203 kit in two ways.

    1. The C8R121A kit contains a "100 gram" mass ring (~ 95 grams) while the C8R2203 kit contains the usual 124/2203/136/2231/2235 "50 gram" mass ring (~ 35 grams).

    2. The C8R121A kit has a much stiffer spider.

    Cones, surrounds, and voice coils are the same.

    The C8R2203 is NLA from JBL while the C8R121A kit is still available. I believe the C8R121A recone kit is ~ $172. The C8R2203 kit is not worth $300. Rarity means absolutely nothing to me. I would buy a brand new LE14H-3 before I would put $300 into a 124 or 2203 rebuild.

  8. #8
    RIP 2011 Zilch's Avatar
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    If Nightbrace can't locate 2203 or 124A, what other JBL 12" woofer options might be worthy of consideration?

    LE14x looks like a good fit, but that'll require enlarging the woofer cutout.

    2214H, 128H, or ME120HS, possibly?

    EN3 dimensions somewhat match what Nightbrace measures, so it's more like 3 cuft. than the 2 cuft he originally supposed....

  9. #9
    Senior Member edgewound's Avatar
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    Quote Originally Posted by Lancer
    The C8R2203 recone kit is used to build a 124A/124H/2203A/2203H driver. That driver can be built from any 121A/121H/124A/124H/2202A/2202H/2203A/2203H/2204H core. NEVER use a C8R2203 kit to build a 121A or 121H. That would be wasting a great cone kit. The C8R2203 should only be used to build a 124A/124H/2203A/2203H. A 121A or 121H can be built with the C8R121A recone kit (still available) using any 121A/121H/124A/124H/2202A/2202H/2203A/2203H/2204H core. The C8R121A recone kit differs from the C8R2203 kit in two ways.

    1. The C8R121A kit contains a "100 gram" mass ring (~ 95 grams) while the C8R2203 kit contains the usual 124/2203/136/2231/2235 "50 gram" mass ring (~ 35 grams).

    2. The C8R121A kit has a much stiffer spider.

    Cones, surrounds, and voice coils are the same.

    The C8R2203 is NLA from JBL while the C8R121A kit is still available. I believe the C8R121A recone kit is ~ $172. The C8R2203 kit is not worth $300. Rarity means absolutely nothing to me. I would buy a brand new LE14H-3 before I would put $300 into a 124 or 2203 rebuild.
    Sir Lancer,

    At first inspection, the 2203 cone kit looks virtually identical to a 2235, yet in a 12" version...is the cone thickness and voicecoil identical? I have some removed 2235 cone kits with rotted surround and cut spider. My question is...would it be feasible to cut down the 2235 cone to 2203 12" diameter and install the correct size foam surround and replace the spider to make a 2203 from a correct core? I know...it's not a complete factory kit...but it could still make a decent imitation if assembled with care. I have an old 121H kit removed from a recone that I could use to make a template to cut down the old 2235 cone with a router and template bit. This could lead to new life for 2203's from recycled 2231/5 cone/coil assemblies....at a reasonable cost.

    Thanks for your input.
    Edgewound...JBL Pro Authorized...since 1988
    Upland Loudspeaker Service, Upland, CA

  10. #10
    dblaxter
    Guest

    121a

    hi lancer ,
    i have tried a few places to get the kit or of send it out to be reconed , i get the same answer , its not available , but if you have the source or can tell me where to send it , or send it to you , etc , it would be great , and thanks for all the info ,
    some same that the 121a has its limits but for me it will work , my house is not huge so ....
    thank you once again ,p,ease let me know

  11. #11
    Nightbrace
    Guest
    How do you guys feel about my tweeter and midrange selections?? I am trying to think BANG for the BUCK here. I have maybe another $200-$300 to spend on both woofers assuming I can get these drivers for around $150 for all 4 of them. Would it be considered "okay" to get AlNiCo woofers to go with the LE25's and LE5-6's? Given my price restriction, are the 2203H woofers even an option??

  12. #12
    Alex Lancaster
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    With the mids and tweets You are planning on, why not L100 or L166 woofers?, I think the 2203īs are overkill.

  13. #13
    Nightbrace
    Guest
    They are probably closest to 2.5 than anything as far as internal volume goes. I was guessing at 2.0, but thats only because thats what the owner of them now claimed them to be. For all I know he may be right, as the wood is very thick.

  14. #14
    Nightbrace
    Guest
    well then what tweets and mids would go well with the 2003H's? Or for that matter what drivers would work BEST in these cabinets??? Thats really what I am after, I do not have any drivers yet, I am merely making a couple suggestions based on my great results with the Decade 36's I have./

    For midranges I personally like the LE5-6, 8's, 10's and 12's best. They sound identical to me. Am I correct in this assumption?? I was amazed to see how close the specs are, my ears must be getting really good . And are there any mids that will exceed the sound quality produced by these drivers??

    I was advised not to go with the LE5-2 drivers compared to the LE5-6's-12's, is there any truth to that. I have not directly heard the LE5-2's in a comaparison with the 6-12's. The efficiency is higher, but what makes the difference, the AlNiCo magent compared to ferritte?

  15. #15
    Nightbrace
    Guest
    What about the 104H-2 mids?? How will these compare?L 104H-2

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