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Thread: DIY JBL 4344 project

  1. #151
    Member JBLP's Avatar
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    Terminals

    Fixed the terminals on the insulation board; ready to screw on the cabinet back panel (from the inside).
    Progress is slowed down due to temperature and humidity in the shed/workshop. I put the cabinets in my house to wait for the better season

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  2. #152
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    Terminals-2

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  3. #153
    Senior Member pos's Avatar
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    Hi Paul

    Why not use 8 pole speakons? That would have been simpler and sturdier.
    Nicely done anyway!

  4. #154
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    Terminals

    Hi Pos,
    My thoughts were: I will be bi-amping the woofers, so to bring the cable back to the 8 pole Speakons is more of a hassle then just go from Amp-2 with speaker cables straight to the woofer terminals.
    For the passive part I wanted to make a sort of plug & play system. Also when I'm not happy with the results of the passive network of one driver, I can just take it (one) out and alter.
    I don't know if I will make (two times) three little boxes or one box for the passive crossover.
    I'm not there yet.......

    This one I like; very nicely made!!!!:

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  5. #155
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    Status

    No further progress

    Too many projects!

    - found old L80T's and another pair of cabinets,
    - found a set S119, mint cabinets, broken tweeters,
    - put a new kitchen in my house:

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  6. #156
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    L80T's

    These are the nice cabinets, need only oil:

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    And this is the set I found on Internet; badly shape cabinets, glossy repainted. But good hardware.

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  7. #157
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    S119

    These I also found on the Internet. Perfect mint cabinets, but only broken tweeters.

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  8. #158
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    What to do with the S119?

    Not much good to be found on the Internet.

    This guy is very negative:
    http://www.thevintageknob.org/jbl-S119.html

    BUT:
    I think the cabinet is really special, original from 1974! It makes a nice piece of art in the living room.

    SO:
    My idea is to make them more JBL. It looks like the woofer is borrowed from another brand, the tweeters also don't indicate JBL.
    I have a set woofers from the L3 and found in Germany replacement tweeter (same size as the "control one" monitors).
    I can also use the network from the L3.

    The "audio-database.com" indicates following:
    A magnetic-shield design for the woofer and only low cut for the crossover.
    What does this mean?

    Steps:
    - built in the L3 woofer; small adjustment with the router,
    - built 4 replacement tweeters in. Don't know the Ohm. Originals are 2 Ohm and connected in series,
    - built the L3 network in,
    - the L3 has a bass vent. The S119 not. Do I have to put in the (tuned) bass vent?,
    - built proper connectors on the back of the cabinet (don't like the bottom in the original),

    Pictures of the S119 hardware:

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  9. #159
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    What to do with the S119?

    Pictures of the L3 hardware and the replacement tweeter:

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  10. #160
    Senior Member martin2395's Avatar
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    Hi Paul,

    It's amazing to see S119's in such shape!
    Sadly i think that I have to agree with the TVK guy, looking at the units and filters JBL used my guess is that they will probably sound mediocre at best.
    The tweeters are most probably Audax TW010 with some variation of the mounting plate, also the woofer looks ok to me.

    The L3 woofer will most probably won't fit due it's rectangular shaped chassis not to even mention the different size of the boxes, different crossover point, tuning

    Also, as you can see the old woofer has a kind of metal can around it's magnet - that is the magnetic shield.
    With it you can place the speaker close to your TV without it causing interference like a purple glow on the screen for example, afaik it's only visible on CRT TV's.

    The low-pass filter means that your tweeters will start playing at a certain frequency (in the S119 - at 3KHz) and will not have to reproduce the bass as that would destroy them very fast.

    Btw, the japanese version of audio-database is called audio-heritage.jp and is still being updated with new info while the english one stopped in 2010.
    http://audio-heritage.jp/JBL/speaker/s119.html

  11. #161
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    S119

    Hey Martin,

    Thanks.
    I can make the woofer fit, and if the crossover is better I will change it also.
    Bas reflex can be made if necessary and calculated to tune it.
    I feel it's worth the effort.

    "Low cut only".
    Yes, the low is cut for the tweeters. And normally, the high is cut for the woofers within the same speaker.
    Don't they mean with "low cut only" that the low is cut for the tweeters and the full signal is send to the woofer? So no "high cut"!

  12. #162
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    I just found this thread today. I read through the entire length of it. Very impressive work. Have you made any further progress on the 4344?

    Andy

  13. #163
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    Progress

    Hey Andy, thanks.
    No progress!!! I had some distraction.
    Got a 4688 from internet; big m...f.... and I'm repairing the drivers. the spiders where deformed (to hot?)
    Got the spiders from reconekits.com. They are not for sale in the Netherlands, apparently no market.....
    Here some pictures:
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  14. #164
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    Progress

    Picture:
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    I like to make this one...... two and maybe mirror imaged:

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  15. #165
    Senior Member martin2395's Avatar
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    You are one mad engineer Paul Now I know where that nice TCB that I wanted to buy went to!
    I almost contacted the seller but my mum said no

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