Repair of loudspeakers

Discussion in 'The Projects Forum' started by DER, Mar 9, 2014.

  1. DER

    Thread Starter New Member

    Feb 13, 2014
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    1
    Hello to all forumites! I am engaged in repair of loudspeakers and I want to communicate with you and to exchange knowledge.
    In this subject, I suggest to discuss repair of all types of loudspeakers. Choice of materials, equipment list, and choice of repair parts of loudspeaker.
     
  2. wayneh

    Expert

    Sep 9, 2010
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    Where would you like to begin?

    добро пожаловать, by the way.
     
  3. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    Repair 18" from EAW, the copy Eighteen sounds 18LW1400.
    Here what took in ремон, someone to me it already rewound the sound coil. (Not good idea to use a paper framework).
    [​IMG]
     
  4. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
  5. bertus

    Administrator

    Apr 5, 2008
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  6. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    Winding voice coil.
    [​IMG]
    [​IMG]
    Winding Outside/Inside
     
  7. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    Ready coil!
    [​IMG]
    [​IMG]
    [​IMG]
     
  8. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    Data of "my" coil.
    Outside/inside winding
    Kapton 0,12mm framework
    Diameter 100,2mm
    Winding height 24mm
    Diameter of a wire 0,355mm
    Diameter of a wire with isolation 0,38mm
    Active resistance 6,4Ohm
     
  9. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
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    One Question ?
    Will it hold when the speaker is in use.

    You'll never know until you do.

    Do post back the results
     
  10. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    Yes of course, the speaker works, to work in a loud-hailer from Cerwin vega. After that I took three more pieces on repair of the same loudspeakers.
     
  11. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    Here ready result. Appearance isn't much "shabby". It was possible to paint laying, but time was a little, I left as is.
    [​IMG]
     
  12. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    Here yet big photoreport. Quality of photos the bad. (It is shot long ago with the mobile phone)
    Loudspeaker 100GDN-3 (12" / 8Ohm/100W)

    Here so factory voice coil looked
    [​IMG]
    Then I reeled up the new voice coil and tried on it in cone.
    [​IMG]
    Assembled
    [​IMG]
    On closer
    [​IMG]
    Then it looked here so, without dust cap.
    [​IMG]
    The finished result.
    [​IMG]

    I made a framework not heat-conducting, and owing to it made in it openings. For the best cooling.
     
    THE_RB likes this.
  13. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Awesome thread! Thanks for posting your techniques. :)

    You obviously have a good coil winder that is a big part of your success, can you give more details on it or post a photo of it?
     
  14. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    Thanks, I am very glad that my diligence are pleasant to someone. I am even more glad that it was useful to someone and was useful.

    I am engaged in repair of loudspeakers, from the high school, with far 2001. I had then no computer, and moreover the Internet where I could learn and broaden something the horizons and knowledge. Therefore my way was long and difficult with tamping of cones and acquisition of "invaluable" experience.

    I have the main work where I assemble solar panels of batteries for space satellites (but it only work).

    But dynamic heads are my passion, I rave them, they at me in blood. It can seem nonsense, but I can't without them I 24 hours per day think of them. Mysleno I twist them almost everything in the head of JBL, Electro voice, RCF, Altec... and so indefinitely.
     
  15. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Nice work.

    What did you use for the bobbin. That is the material.
     
  16. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    For voice coil framework I use an aluminum foil, a copper foil, Kapton, paper, fiber glass fabric and sometimes Nomex.
     
  17. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Any glue.
    What are you using to hold the coil to bobbin.

    I am asking cause in high power ones the voice will come off if they are not glued.

    The ones I made before did came off when the darn thing played at full power.

    for 100W it may not be an issue but at 400W +, it will come off.
    You can see that in the originals that you wound
     
  18. DER

    Thread Starter New Member

    Feb 13, 2014
    18
    1
    I have some glues, each glue for each type of a framework. It is impossible to use one glue on all types coil frameworks. Because on one it keeps on others isn't present. Therefore not many different glues.
    To me would be very interestingly what glue (or a type of glue) use on production of dynamic heads, such as JBL or Electro voice.
    That glue which I use is on an epoxy basis and holds temperature according to the passport of 250 degrees Celsius.
     
  19. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Check out voice coil bonder
     
  20. #12

    Expert

    Nov 30, 2010
    16,345
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    Interesting on 2 levels, how speakers are built and how Russian translates into English.
     
    mcgyvr likes this.
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