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Thread: JBL 035Ti repair

  1. #31
    Senior Member
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    Quote Originally Posted by Bart
    EarlK: That waterfall plot is great. What software and measurement system are you using?
    - You're looking at some results as captured and dispalyed by ARTA .

    - Author of this software is : Ivo Mateljan , Electroacoustic Laboratory, Faculty of Electrical Engineering, 21000 Split, Croatia.

    - Download his shareware Here !

    - I use an M-Audio USB card. This is it ( it has more input channels than necessary / most people should look at the Fast Track Pro instead ) >

    - My test mic is this Audix TR40. >


    Quote Originally Posted by Bart
    Do you have plots which extend the Frequency (X-axis) marking back to the Zero time mark so that it is easier to see where the resonance ripples and troughs are located?
    - Sorry , but I don't have that file saved ( so, I have no ability to reprocess without retesting ) .

    - I agree that these semi 3D perspective makes it quite hard to precisely connect a frequency to "some big bulge in the color" .

    - It's easier to make the connection using the "sonogram" layout which is 2D ( and makes no bones about it ) .


    >< cheers

  2. #32
    Senior Member spirou38's Avatar
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    Quote Originally Posted by Earl K View Post
    Pascal, I'm very impressed when someone executes a successful repair such as you have . Good Show !
    Hello Earl K,

    ... But it should have been better with some pictures ...

    Quote Originally Posted by Earl K View Post
    - At the bottom is the response for one of my 035Ti(s) . This was taken a few months back . It was either 20 or 25 degrees off-axis .

    - Previous to these ARTA measurements, just listening to the "crest-factor" of pink noise being run through this tweet led me to the conclusion that it was a nice tweeter .
    - My CSD would seem to support that view .



    >< cheers
    ARTA seems very interesting.
    I think I will soon try but I should have to enter my Earthworks M30BX mike calibration file first.
    Here is a scan of the response curve on the Earthworks document :
    I have 2 files on a CD : a .TXT and a .MIC.
    Here are the beginning and the end of the .TXT and the .MIC files converted in .doc. The .MIC was specially made for the TACT RCS 2.2 digital preamp.


    Sorry but I never succeed in inserting the pics and links where they should be
    Attached Images Attached Images  
    Attached Files Attached Files
    Spirou38 JBL 4344MKII 4333A 4312MKII L80T L40 L20T Ti2000

  3. #33
    Senior Member spirou38's Avatar
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    Quote Originally Posted by mech986 View Post
    Spirou: Great job on the repair. Excellent engineering of the solution, and certainly a good technique. For your information, the tool you pictured is called a Vernier Caliper and it is very handy to have.

    See this reference:
    http://en.wikipedia.org/wiki/Caliper
    Hello Mech986,

    Thank you for the free English lesson .

    My 2 vernier calipers were very helpful for the repair but one of them was very dificult to use because it is not made of a good stainless steel
    Spirou38 JBL 4344MKII 4333A 4312MKII L80T L40 L20T Ti2000

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