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Eminence Grise

Discussion in 'Electronic Repair' started by N_Cook, Jul 10, 2013.

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  1. N_Cook

    N_Cook Guest

    well noire rather than grise
    I'm not geting a consistent story from the recording studio where these
    2 Marshall MG250DFX came from, with Eminence 2x12 in each. One amp , one
    of the headers was partially disconnected for the power and signal to
    one TDA7293 PA. Would this be a possible scenario. TDA o/p driven to DC
    with loss of one rail and burns out one of the speakers but as music
    still coming from the other, not much thought about it at the time,
    perhaps reporting smoke/loss of power to someone at the studio. Then
    someone with the studio jumpers back-to-back that amp to the speakers of
    an exactly similar amp, and blows the mirror-handedness speaker of that
    combo.?
    First one seriously burnt up including part of the spider, but the
    second one barely had time to get warm before the wiring of the VC fused
    o/c so not even any scorching on the VC former , but a neat split. The
    first blown speaker due to intermittant DC and then the second full on
    DC drive?
     
  2. N_Cook

    N_Cook Guest

    I deconed the second speaker and the magnetic/DC current force was so
    great it axially split the former of the VC, beyond the inertia of the
    cone, tearing the VC tails and so fast that not the slightest trace of
    any heating anywhere
     
  3. Guest

    It's an eminence front, it's a put-on.

    I'll get my coat.

    Matt Roberds
     
  4. N_Cook

    N_Cook Guest

    I wonder if there was no real bang if the cone had no chance to move any
    air, and there was little more than a ripping noise
     
  5. Phil Allison

    Phil Allison Guest

    "Nutcase Kook"

    ** If I have de-coded Kook's tortured English correctly - what happened
    was the voice coil separated from the cone and this instantly broke the tiny
    copper feed wires that carry current to the coil from the tinsel leads, so
    precluding the chance of a fire.

    Strongly suspect the VC to cone attachment was already weak or damaged for
    this to happen.



    .... Phil
     
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