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Determining power handling of a speaker ?

Discussion in 'Electronic Repair' started by N Cook, Jan 11, 2007.

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  1. Eeyore

    Eeyore Guest

    That'll change the resistance won't it ?

    Graham
     

  2. Really? How do they maintain the impedance? The resistance would go
    up quite a bit, and the insulation wouldn't last very long. It sounds
    like another audiofools dream.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  3. I seem to recall some manufacturer in the 1980s demonstrating something like
    this, touting the durability of their kapton voice coil formers. I am not
    sure that the demo was using actual voice coil wire.

    Leonard
     
  4. Ron(UK)

    Ron(UK) Guest

    It does, that`s why power compresion occurs.

    and the insulation wouldn't last very long.

    probably not, I have seen coil formers baked very brown by the heat
    from the coil without the coil itself failing, I doubt the actual voice
    coil could withstand glowing red, specially as they are almost always
    copper or aluminium. Maybe the term red hot was meant as a
    colloquialism for 'very very hot', certainly above 100c

    I`m quite prepared to be educated tho.

    Ron(UK)
     
  5. Eeyore

    Eeyore Guest

    It does ! The effect is usually called 'power compression' and it can typically
    knock up to 3dB off the speaker sensitivity with prolonged high power use. That'll
    give you some inkling as to the temp rises involved.

    Since such speakers are invariably used with 'active crossovers' on the inputs to
    the amplifiers it doesn't cause any adverse issues with crossover responses.

    The company that first made that 'red hot' claim was Precision Devices. You can
    find a 1000W continuous rated speaker of theirs here.

    http://www.precisiondevices.co.uk/showdetails.asp?id=17

    Kapton voice coil formers are now the norm for decent quality speakers.

    I have *never* seen a purely thermal failure in any *modern* voice coil.

    Graham
     
  6. Ron(UK)

    Ron(UK) Guest

    I`ve seen the pigtails melt before the voice coil does.

    Ron(UK)
     
  7. Meat Plow

    Meat Plow Guest

    I'm a musician who plays bass. My rig is a 1000 watt rms Crown
    Microtec power amp biamped to a 4x10 cab and 1x15 cab. I caught the Cerwin
    Vega 15" speaker on fire at an outdoor gig and didn't even know it until
    people in the crowd yelled at me. Prior to that, the speaker was reconed
    and I guess the person who reconed it used flammable materials as I'm
    pretty sure a speaker cone isn't supposed to catch fire. And since we had
    a fire extinguisher hand I was able to put it out right away saving the
    cabinet. I measured the voice coil and it wasn't open or shorted. I sent
    it back to the local reconer and he redid it for free and promised it
    wouldn't catch fire again which it never did.
     
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