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Thread: 4312A clones.

  1. #1
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    4312A clones.

    Hi all.

    I have plans to build 4312A clones.
    I have a comlete setup of 035ti tweeters, 104h-2 midranges and 2213H woofers.

    I need to know dimensions of the enclosures and the port tubes.

    All info would be most appreciated.

    Best regards John.

  2. #2
    Senior Member spirou38's Avatar
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    4312A clone

    Hi John,

    Happy new year 🎈🎆🧨🎉

    I just made a drawing with Excel, all dimensions are in millimeters.

    Here is the front side :
    Name:  JBL 4312a dimensions 1 Front.jpg
Views: 286
Size:  54.0 KB

    The back side :
    Name:  JBL 4312a dimensions 2 Back.jpg
Views: 289
Size:  50.4 KB

    And the top view of AB cut :
    Name:  JBL 4312a dimensions 3 Top view of AB cut.jpg
Views: 284
Size:  43.3 KB

    I cant measure the thickness of the walls ...
    The inside diameter of the port is about 70.8 mm but it is impossible to measure it because it is an angled port 😥 .

    I hope it will help you,
    Best regards from France,
    Pascal
    Spirou38 JBL 4344MKII 4333A 4312MKII L80T L40 L20T Ti2000

  3. #3
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    Thank you Pascal.

    This will help me alot.

    Are the measurements from your 4312 Mk 2? I used to have a pair of the Mk 2´s that is why i am doing this project.

    I have another question. I would be happy if you could provide the measures 1- 10 on my picture.
    Name:  4312Frontmeasurements.jpg
Views: 284
Size:  78.1 KB

    Best regards John J.


    Quote Originally Posted by spirou38 View Post
    Hi John,

    Happy new year 🎈🎆🧨🎉

    I just made a drawing with Excel, all dimensions are in millimeters.

    Here is the front side :
    Name:  JBL 4312a dimensions 1 Front.jpg
Views: 286
Size:  54.0 KB

    The back side :
    Name:  JBL 4312a dimensions 2 Back.jpg
Views: 289
Size:  50.4 KB

    And the top view of AB cut :
    Name:  JBL 4312a dimensions 3 Top view of AB cut.jpg
Views: 284
Size:  43.3 KB

    I cant measure the thickness of the walls ...
    The inside diameter of the port is about 70.8 mm but it is impossible to measure it because it is an angled port 😥 .

    I hope it will help you,
    Best regards from France,
    Pascal

  4. #4
    Senior Member spirou38's Avatar
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    Hi John,
    Here are my measurements in millimeters:
    1 = 133 for the midrange speaker that is roughly a square
    2 = 72 the diameter of the hole is 75
    3 = 127
    4 = 77 from the inner side of the right wall to the center of the left potentiometer knob
    5 = 32 from the inner side of the right wall to the center of the right potentiometer knob
    6 =29 from the inner side of the upper wall to the center of the potentiometer knobs
    7 = 30 for the midrange speaker that is roughly a square
    8 = 122
    9 = 20 for the tweeter
    10 = 20
    Don't forget that the front walls are mirrored !
    For the tube port, according to the JBL Component Exploded View, the part number is 52211 and it seems to be symetrical so I will try to make a drawing with the supposed dimensions.
    Rgds,
    Pascal
    Spirou38 JBL 4344MKII 4333A 4312MKII L80T L40 L20T Ti2000

  5. #5
    Senior Member spirou38's Avatar
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    Quote Originally Posted by TiGgR View Post
    This will help me alot.

    Are the measurements from your 4312 Mk 2? I used to have a pair of the Mk 2´s that is why i am doing this project.

    I have another question. I would be happy if you could provide the measures 1- 10 on my picture.

    Best regards John J.
    Here is the port drawing with estimated dimensions.
    Name:  JBL 4312a dimensions 4 The port tube.jpg
Views: 241
Size:  31.9 KB

    Pascal
    Spirou38 JBL 4344MKII 4333A 4312MKII L80T L40 L20T Ti2000

  6. #6
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    Thanks alot Pascal.

    This will defenetly help me build speakers close to original.
    Now i can start to draw the buildplans.

    This project will take time but i will post pictures of my progress here.

    Thanks again for the help.

    Best regards John.

  7. #7
    Junior Member
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    Sarasota, Florida
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    20

    4312A clones

    Are you going to use a crossover similar to the original or something like the 4412?

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