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  1. #1
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    Building a 4343 Clone

    Hi there
    I am starting out to build a pair of 4343 speakers.
    My thoughts are, that wether or not to build the 4343B or the 4343A, depends on what kind of 10" I source(2121A or 2121H - I would prefer Ferrit magnets as I do not have remag capabilities on hand).

    I am of course aiming towards sourcing the following:
    2405
    2121
    2231

    2420 + horn + lens (I have these already)

    And then build the 3143 network (Or the Charged coupled network, before I can source the original).

    I would very much like the speakers to look and sound as the 4343 speaker, as they were built "back then" - not doing something different that makes them something else.

    Just to be clear, (Because I have possibility to buy both 2122H and 2235H speakers) How different are these, in terms of the final product?
    Would you, knowledgeable people here, consider that to be wrong, or are they compatible replacements for the 2121 and 2231 drivers.

    It could be a point of "getting going" in the project, to buy 2122h and 2235H for now, build the speaker and then keep watch for 2121 and 2231 drivers along the way. But not if they are sonically "wrong".

  2. #2
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    Quote Originally Posted by santashooter View Post
    Hi there
    I am starting out to build a pair of 4343 speakers.
    My thoughts are, that wether or not to build the 4343B or the 4343A, depends on what kind of 10" I source(2121A or 2121H - I would prefer Ferrit magnets as I do not have remag capabilities on hand).

    Just to be clear, (Because I have possibility to buy both 2122H and 2235H speakers) How different are these, in terms of the final product?
    Would you, knowledgeable people here, consider that to be wrong, or are they compatible replacements for the 2121 and 2231 drivers.

    It could be a point of "getting going" in the project, to buy 2122h and 2235H for now, build the speaker and then keep watch for 2121 and 2231 drivers along the way. But not if they are sonically "wrong".
    Okay

    I will go first

    The short answer is if you can obtain a 2122H use it as in a 4344 at a later date or put it on ice.

    I Will gladly buy it off you later. These are now impossible to obtain

    The 2122 is a smoother driver than the 2121 with somewhat different frequency response

    It has a somewhat different passive crossover as a result

    The devil is in the detail

    It’s a good upgrade path if you have a clapped out old 4343.

    The 2235 is the full SF conversion from alnico. The Vc has a higher power rating and the spider if l am not wrong is progressive. But it’s tuning and everything else make it interchangeable with a 2231a

    My suggestion is acquire the 2122H now along with the 2235H to get you going.

    Build the baffle as a 4343 and use a new equivalent 3145 passive crossover for now.

    Buy a DR162425 diaphragm and put in the 2420 or buy a 2425 compression driver as the 3145 crossover is optimised for this driver.

    When you later acquire a 2121 then use it with a clone 3143 network for the purposes of authenticity

    You could then decide what to do with the 2122. I would build a 4345 authentically

    This is my rational.

  3. #3
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    Thanks Ian - that goes well along the lines of my thoughts!

    I don't think I will change the diaphragms in my 2420's though as these are with red wax seals, and sounds amazing as is.
    Would putting foam surround on a pair of LE10A be a better option, in terms of matching the 2121 frequency response, so I can use the 3143 crossover and keep the 2420 diapragms?

  4. #4
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    No leave the existing surround


    The LE 10a and the 2121 are 10 inch drivers
    That is where the similarities end

    The reference efficiency of the LE10a is 0.6%
    The reference efficiency of the 2121 is 2.7%

    That won’t stop you trying the LE10a

    The crossover won’t be optimised but you can try it.

    The sensitivity of the 2420 and the 2405 will be way higher so the Lpads will need turning back -10 dB or more.

    The LE10a will go lower

    You can build a 2121 using after market recone kits and finding a suitable 10 inch basket

    See the 4343 reference thread

    I would not trash the LE10a. In fact l would look at building a 4313

  5. #5
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    Quote Originally Posted by Ian Mackenzie View Post
    You can build a 2121 using after market recone kits and finding a suitable 10 inch basket
    I would normally look away from ever using an aftermarket kit, but this sounds interesting - I can't find the post/thread though?

  6. #6
    Senior Member Odd's Avatar
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    Using Google, the search feature in the forum is not very good.

    http://www.audioheritage.org/vbullet...erences-Thread
    43XX (2235-2123-2450-2405-CC 3155)5235-4412-4406-4401-L250-18Ti-L40-S109 Aquarius lV-C38 (030) 305P MkII

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    Thanks a lot

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