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Thread: Building a 4343 Clone

  1. #16
    Senior Member Ian Mackenzie's Avatar
    Join Date
    Apr 2003
    The Tardis
    Quote Originally Posted by macaroonie View Post
    Lets not do the MDF thing , OP is in Denmark , Baltic Birch ply is commonplace and the dust won't kill you.
    From memory baffle is 25mm and the sides and back are 18mm with substantial. bracing.

    Just as a second thought , why not DSP the whole shebang. M4 !!
    In the other thread Authenticate a 4343 the poster wants authenticity period.

  2. #17
    Join Date
    Jan 2010
    I am trying to hit authenticity where possible - I know there are easier, and even better materials to choose from, but in the end, I want my clone to be a JBL 4343 reproduction, not something that looks like it.
    The first hurdle is going from imperial to metric measurements in available sheet thinknesses.

    From what I have been able to gather from seeing pictures of 4343 baffles, it seems the baffle is also made of particle board, at least the square upper part, together with the mid-box.
    The back is also Particle board.
    The bracing seems to be pine or Birch bracing, based on the pictures alone.
    I'll need to verify baffle, back and side thicknesses before I can order sheets.

  3. #18
    Join Date
    Jan 2010
    i have been looking at the parts list from Solen - Wowza, that is a hefty price tag!
    and then more than 300 in shipping alone + import taxes.
    Been looking at local Jantzen components instead, but some values are impossible to find (take for example 160uF caps) - is it crucial for the crossover, that we are hitting exact values here?
    What is the rule for combining caps and resistors to match the values in the diagram?
    and do anyone have good input on somewhere in Europe, from where I can order this stuff?

  4. #19
    Senior Member Ian Mackenzie's Avatar
    Join Date
    Apr 2003
    The Tardis

    I will try and frame this area with some economic rationalism.

    Imagine you were in production like Jbl.

    What they did was evaluate alternatives.

    The parts in that list are the ideal choices and because it’s charge coupled you need four times as many capacitors so it’s not an inexpensive aspect of the project

    Secondly, you can Biamp which avoids building the woofer filter and some parts of the 2122 filter

    Biamping is where a high level active filter splits the frequency range into two halves after the preamp so you have low and high outputs that go into a a power amp then the woofer (low) and the mid+horn+slot (high)

    In general terms it’s the preferred way to run this kind of loudspeaker
    You will need an active crossover and two Stereo power amps.

    Looking at the parts some areas there options in terms of capacitors.
    For example in the very early systems Jbl used Mylar capacitors (green caps these days).

    What Jbl did in the last iteration of this system the 4344mk11 was to select some cost effective alternatives to expensive polypropylene capacitors in key areas which made a lot of sense. The woofer filter capacitors are non polarised electrolytes types (NPE) bypassed with small value polypropylene capacitors like 0.01. The woofer filter was not charge coupled in production.

    So you can save a heap of money there.

    Next the 2122 high pass mid filter capacitors Jbl selected non polarised electrolyte (NPE) bypassed with small value polypropylene capacitors like 0.01. These capacitors are charge coupled.

    The low pass section of the 2122 filter and the high and uhf filters use polypropylene charge coupled capacitors. Basically all the capacitors in red on that list could be non polarised electrolyte (NPE). The rational is cost. You will probably not use this aspect of the crossover once you Biamp and after that you probably won’t go back to full passive operation.

    Don’t worry about working out a list right now. I am just relaying you an approach

    It will do exactly what the other list does but in a far more cost effective manner.
    I can draw it up for you if you like.

    In the diy space of course people don’t have cost limitations only the depth of their pockets.
    To get you up and going the above is being smart. Later on once you sort out the drivers you can go for broke if that’s your plan.

    Send me a PM and l will go through it in more detail.

    In the diy space crossovers and in particular capacitors attracts a lot of conversations so beware

    Finally, check out Parts Express. Their shipping cost might be lower

    Edited for clarity 5.14 pm ESAT

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