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Thread: JBL 4355 Replica

  1. #1
    Senior Member berga12's Avatar
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    JBL 4355 Replica

    Dear JBL lovers,
    I would like to share with you my JBL4355 replica, from Italy!

    first of all this is a really expensive project, and it's really difficult to find components in good condition...
    I was coming from a Setup build up with JBL4560 with Altec 416-8A and 2441 in 2350 plus fostex Ft65h (i'm still owner of box and horn )
    so...2441 was present...lets start.

    I decided since beginning to avoid a FULL replica with Classic blue and classic walnut veneer, not because i don't like, but to avoid drastic mistakes and reduce a bit enclosure cost (i'm not expert in veneer and i've no skills to do it). A carpenteer friend of mine help me in the construction than i'm finishing in house the internal furniture.

    we used 24mm birch (really heavy strong and dense) for full structure, at the end is something like double the weight and rigidity of a normal playwood (a 24mm thickness count something like 14-16 layers)

    we decided for a removable back to help working inside, maybe later on, this back panel will be fixed and glued together with the box, let see how it sound...

    I decided to try with a normal filtering without Charge coupled variant, but i will try also the equivalent schematic simulating the autotrasformer.
    I Re-use some material coming from previous setup, so expense was not huge, and i'm also thinking to try a full passive variant.

    for the moment I just found an UREI 5235 and I'm going to build 290hz 18db board for him.

    I'll start with a couple of UCD400H&R for woofers and MC2120 alternate with Uesugi 211 tube amplifier for mid-high.

    At the moment I miss 4-2235h, I found them in USA but I'm thinking about the huge expense to bring them to Italy (i just bought a mint 2202h couple from USA...sigh!) but I have 4 E140 basket empty and 4 2226h that i want to try (setting the tune to 35hz), simulation show not far away response, even if i suppose 2235 sound far much lower and better (maybe)...

    so, come on and Kill me with suggestions/opinions!
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  2. #2
    Senior Member berga12's Avatar
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  3. #3
    Senior Member berga12's Avatar
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    againName:  09_RearBraceBackopen.jpg
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    Senior Member berga12's Avatar
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  5. #5
    Senior Member berga12's Avatar
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    I found nice 077 Alnico, so i will go with them...

    2405 i've on a pair of JBL4315 original, also Alnico version but yellw diaphagram, i suppose they sound similar.


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  6. #6
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    WOW!

    Very Very nice!!!

    If I may, If it's not too late! I would use a bigger gauge for the wiring.
    And I would make sure that the back panel is very well attached to the back of the 2202 chamber.
    Vibration from the bass could give you some parasite sound.

    I want to build an other pair...
    C

  7. #7
    Senior Member berga12's Avatar
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    Thanks!

    wire is 1,3mmq teflon insulate mil spec, OFC copper silver plated.

    i can duplicate the size on the woofer (up to 2,3mmq each conductor +/-)

    for mid-high should be enough.


    i still need to compensate 6-7mm between MID box and back panel,but i've two solution:

    - Just a Neoprene gasket to avoid any kind of vibration plus 2 screw on the back of the box
    - compensate the 6-7mm with solid wod panel and add 5 screw on the back of the box ( one in the center one on each corner)

    you think 1,3mmq is not enough as wiring? it should easily handle 6-7Amp (not common for an house usage...)

  8. #8
    Senior Member berga12's Avatar
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    Filter progress, for the moment i will use a 2,2mH Jantzen toroidal coil (i've those ones at home ), let see, in case i will buy some Mundorf L200 air core 2,4 (i've some 3.3mH and don't want to un-wire them...)

    i will also place 0.01uF bypass capacitors, 2441 attenuation i will try with Autotrasformer if needed.

    All Series component are Mid-high quality, parallel one a bit less but still nice level.

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  9. #9
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    Quote Originally Posted by berga12 View Post
    Thanks!

    wire is 1,3mmq teflon insulate mil spec, OFC copper silver plated.

    i can duplicate the size on the woofer (up to 2,3mmq each conductor +/-)

    for mid-high should be enough.


    i still need to compensate 6-7mm between MID box and back panel,but i've two solution:

    - Just a Neoprene gasket to avoid any kind of vibration plus 2 screw on the back of the box
    - compensate the 6-7mm with solid wod panel and add 5 screw on the back of the box ( one in the center one on each corner)

    you think 1,3mmq is not enough as wiring? it should easily handle 6-7Amp (not common for an house usage...)
    I would increase to 1.63 to the high and 2.06 to the bass. That's what I would do.
    The conductibility quality is of course important but the quantity also.

    Here is the conversion table: http://www.firemountaingems.com/reso...ia/charts/6404

    And I would recommend for your speaker wires, 12 guage, 2,06 mm... At least...

    I would go with the wood and screws...

    Cheers!
    C

  10. #10
    Senior Member srm51555's Avatar
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    Those are looking awesome, nice work.

  11. #11
    Senior Member berga12's Avatar
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    ok let say, for woofers i will double the cable up to 2,6mmq (c.a. 10AWg)

    for 2202h and 2441 & 077 i would keep 1,3 (16 Awg), i will not give them never more than 100W, way to much...

    i can mybe think to double the section on 2202h... even if his cable is quite short.


    Main cable will be something like 4x4mmq, so no problem.


  12. #12
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    Quote Originally Posted by berga12 View Post
    ok let say, for woofers i will double the cable up to 2,6mmq (c.a. 10AWg)

    for 2202h and 2441 & 077 i would keep 1,3 (16 Awg), i will not give them never more than 100W, way to much...

    i can mybe think to double the section on 2202h... even if his cable is quite short.


    Main cable will be something like 4x4mmq, so no problem.

    Up to you! 16 is too small. You won't even go to 100 Watts. If you go that far, you will destroy your hearing. They are soooo efficient!
    You don't need 10 guage below 50 feet. If you bring 10 to the terminal and you don't have anything to follow, whats the point??
    14 for the high is what I would do...
    Cheers!
    C

  13. #13
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    Water hose!

    i can mybe think to double the section on 2202h... even if his cable is quite short.


    If the hose section is small, even a short hose will not give you a lot of water...
    Do you see what I mean? I would do the same to the 2405 and 2441...
    But it is just me...
    C

  14. #14
    Senior Member berga12's Avatar
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    i'm Just speaking about internal Wiring

    lenght are something like:

    25" for every woofer

    30" for Mid 2202

    35" for both 2441 & 077


    External wiring from Amp to SPeakers will be something like 10-15feet, not more.

  15. #15
    Senior Member berga12's Avatar
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    Thumbs up

    Quote Originally Posted by Challenger604 View Post
    i can mybe think to double the section on 2202h... even if his cable is quite short.


    If the hose section is small, even a short hose will not give you a lot of water...
    Do you see what I mean? I would do the same to the 2405 and 2441...
    But it is just me...
    C

    i get your point and i'll take this suggestion.

    those speakers can be driven in any case with Few watts for home listening.

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