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Thread: Ditton 66 problem

  1. #1
    Join Date: May 2020

    Location: Croatia

    Posts: 6
    I'm Vuk.

    Default Ditton 66 problem

    Two days ago I noticed that both bass drivers have a slight distortion, or is it some kind of resonance, exclusively at 250hz.
    Does anybody encountered a similar problem?

    I excluded the signal source as a possible cause, or cabinet itself, crossover, cables.
    I'll check the amplifier tomorrow, that's the only thing left.
    For now, I've solved the problem by reducing the input level on power amp (luxman m03).
    That distortion, if I can call it distortion, is virtually inaudible when listening to music, I only noticed it when I tested the speakers with those samples of frequencies, but I was shocked to hear it on both bass drivers.

    Thanks in advance for any idea.
    Sorry for my bad english.

  2. #2
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,861
    I'm Dennis.

    Default

    First guess, coil binding in gap.

  3. #3
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

    Default

    Quote Originally Posted by Pharos View Post
    First guess, coil binding in gap.
    Likely. The weight of the cones may have caused the suspension to sag slightly, resulting in the coils being at a slight angle relative to the magnet pole piece permitting rubbing. A simple 180 degree rotation of the drivers can sometimes cure this, but there are other options.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  4. #4
    Join Date: May 2020

    Location: Croatia

    Posts: 6
    I'm Vuk.

    Default

    That's it. When I gently push the cone outward distortion stops.
    Somebody told me that 180 rotation can not give result immediately, is that true?

  5. #5
    Audio Al is offline Pishanto Specialist & Super-Daftee
    Join Date: May 2012

    Location: Dagenham Essex

    Posts: 11,215
    I'm Allen.

    Default

    It wont happen instantly and will take time to sag the other way , Give it some time and see what happens
    [

  6. #6
    Join Date: Oct 2015

    Location: Woodmancote, West Sussex

    Posts: 1,629
    I'm Ian.

    Default

    I had a similar problem with my MS Signifer's 12" drivers. I turned them 180 degrees and the distortion stopped after a day or two.
    Turntable
    Toshiba SR-370/Mission 774/Van Damme cable with MS Starline plugs/Ortofon Quintet Black
    CD
    Cambridge CXC transport/modified Musical Fidelity X-DAC/modified Musical Fidelity X-10 V3 tube buffer
    Network Player
    Cambridge NP30
    Amplifier
    Denon HA-500 head amp/Nakamichi CA-5E pre-amp/Chinese passive RVC/Proton AA-1150 DMC power amp
    Speakers
    Mordaunt Short Signifer on original factory stands
    Cables
    Mogami with Rean Neutrik plugs/NVA LS5
    Headphones
    Sennheiser HD600/Sennheiser HD650/Koss Pro4 AA

  7. #7
    Join Date: May 2020

    Location: Croatia

    Posts: 6
    I'm Vuk.

    Default

    Ok, 180 degree rotation done, now I have to wait.
    Thank you all.
    I will let you know how it turned out, it might be useful to someone.

  8. #8
    Join Date: May 2020

    Location: Croatia

    Posts: 6
    I'm Vuk.

    Default

    Guys, is there any other way to speed up this thing?

  9. #9
    Join Date: May 2008

    Location: Surrey

    Posts: 7,103
    I'm Rob.

    Default

    Buy Bose...And get your parking validated!.

    https://youtu.be/ZCBe7-6rw4M

    No Highs...No Lows....It Must Be Bose!

  10. #10
    Join Date: May 2020

    Location: Croatia

    Posts: 6
    I'm Vuk.

    Default

    Nice system you have there

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