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    The horn you're showing ( links to ) is a...

    The horn you're showing ( links to ) is a "Back-Loaded-Horn" ( aka; BLH ).

    The back wave combines with the front wave at around 300hz ( so above 300hz the output is all about what comes directly...
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    Eric, 300 to 400hz is about the top-end extent...

    Eric,

    300 to 400hz is about the top-end extent of what you can expect from a 15" woofer working within a folded horn.

    Also, the le15a was never known to be a good horn driver ( merely adequate...
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    I don't see the difference between the 416z and...

    I don't see the difference between the 416z and the 515b as a show stopper.

    Here's a comparison of these two woofers ( the pics originate from a Japanese blogger who noted his repair efforts while...
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    The bolts you seek have a "Fillister...

    The bolts you seek have a "Fillister" head.

    I'm not sure what the thread size is.

    :)

    PS; Here's an older post of mine responding to the same question.
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    It's been mentioned ( & it makes sense to me )...

    It's been mentioned ( & it makes sense to me ) that those numbers indicate just how much ( likely in microns or some very small unit ) that quadrant of the phase plug is out of spec. to the exact...
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    Sorry, no idea what 4320's are worth . :)

    Sorry, no idea what 4320's are worth .

    :)
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    I'd only pursue the 4320's if you are going to...

    I'd only pursue the 4320's if you are going to swap the woofs for 2216nds and do something similar to the HF (like you did in your current speakers ) .

    IOW, gut the 4320's and start again ( using...
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    The Studio 5 Series is still finding a lot of ...

    The Studio 5 Series is still finding a lot of love from recent buyers ( many testimonials are found over at AK ).

    See this thread ( one of a handful )!

    Here's one beefy little driver from...
  9. 4313B & Harvey Gerst have now been re-classified into "Guest" status?

    When ex-members are reclassified to "guest" status all their posts become un-searchable.

    That's a real shame ( and a form of revisionist history that I don't agree with ).

    Can this be undone ?...
  10. Here's a thread worth reading ( with some very...

    Here's a thread worth reading ( with some very detailed 4344 plans in pdf form ).

    4344 plans, as drawn by ayaboh

    As far as I can remember there are no detailed build plans for the 4340/1 or...
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    I'd recommend that you now stop fiddlin with...

    I'd recommend that you now stop fiddlin with diaphragm fitment ( those 2 are as matched as anyone else might achieve ). So, Congratulations!

    Distortion specs won't be reliable until measurements...
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    FWIW, (Speaker) Dave does instruct the OP to...

    FWIW, (Speaker) Dave does instruct the OP to place the bagged woofer on top of masonite or 1/4" plywood which in-turn rests on and is cushioned by, 3/4" - 1" styro-foam sheet ( or foam peanuts in...
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    Yes, R3 modifies the 8 ohm Lpad down to a working...

    Yes, R3 modifies the 8 ohm Lpad down to a working circuit impedance ( for the HF leg ) of @ 5.7 ohms.

    :)
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    RL1 + RL2 represents the DC resistance of the...

    RL1 + RL2 represents the DC resistance of the coils ( inductors ) that Zilch used in his design ( IOW, they are not separate resistors ).

    :)
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    IMHO you are just asking for trouble shipping...

    IMHO you are just asking for trouble shipping both woofers mounted onto a single piece of plywood.

    It becomes harder for the shipper ( + the guy in the truck ) to manage such an unwieldy ( & heavy...
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    By measuring FR response ( before & after ). ...

    By measuring FR response ( before & after ).

    One can make and use paper shims .

    :)
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    It's impossible to answer your question since (...

    It's impossible to answer your question since ( IME + I'm in Pro-Audio ) a good 25% of JBL's over-the-counter replacement diaphragms had ( in the past before production was shifted to Mexico )...
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    http://www.audioheritage.org/vbulletin/attachment....

    http://www.audioheritage.org/vbulletin/attachment.php?attachmentid=84317&d=1559565537

    This photo of yours ( of 2x 2441 diaphragms ) shows that each diaphragm indeed has 8 shims evenly spaced...
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    The response of your "good" 2441 diaphragm looks...

    The response of your "good" 2441 diaphragm looks to be normal.

    Its rising response will flatten out somewhat when you put the 2308 ( slant-plate ) in front of the 2311 horn.

    You might want to...
  20. Excepting when positive was actually the Black...

    Excepting when positive was actually the Black Terminal ( which is the case in virtually all the legacy drivers made pre mid-1990's ).

    :)
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    A great way to get familiar ( + intimate ) with...

    A great way to get familiar ( + intimate ) with the sound of your le14 is to ( indeed ) listen to it full range with a "smidge" of UHF ( mostly above 10K ) filling in the "air" .

    This setup will...
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    S3900 Technical ( spec ) Sheet pdf...

    S3900 Technical ( spec ) Sheet pdf
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    Hi, I don't think the internal volume for...

    Hi,

    I don't think the internal volume for sub-enclosure housing the 2123H ( within the 4344mkii ) was ever specifically revealed ( though 4313B used that mid in a 4345 creation of his ).

    If you...
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    Keep Searching the site! The info is out there....

    Keep Searching the site! The info is out there.

    Use Techbot ( or 4313B as the thread author ) and L110 in the text field that needs to be discovered.

    - There's very detailed info available for...
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    The Radians are likely your best choice > they'll...

    The Radians are likely your best choice > they'll mostly work, though the plastic surround makes them sound closer to the original 2440 ( IOW + IME, sounding "softer in the top-end" than an actual...
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