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I don't have the reference handy to feel comfortable deleting this right now... but IIRC the aluminum rings are not for cooling. They are to dampen a certain motion or magnetic field. The ring appear as a shorted coil to the moving coil and the current induced in it counter-acts the field generated
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When a coil (or part of it) is locked or out of the air gap it will be generating no back EMF, this will effectively reduce the speaker impedance to it's DC resistance. This could potentially be much less than expected resulting in overheating. Is this a real problem with the over hung coils or is
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Probably due to the various parts of the amplifier train powering up in an unexpected order and amplifying a unintended DC offset to full-scale that causes the speaker to be driven to one of the extremities as the system stabilises. Numerous amplifiers have a relay that leaves the speaker output
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I find it amusing that there are no images of voice coils in this article. Perhaps I will take a few this evening and upload them - maybe one picture with a variety of coils, and a ruler or something to indicate approximate sizes?
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Yes, but if you drive a coil with a sinusoidal lowish frequency current, is not the cone displacement proportional to that instantaneous current? (assuming a linear compliance of the surround) --
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I'd have said "eventual cone displacement" (to indicate that that would be the static end point rather than the dynamic situation) and "counter EMF", but otherwise, this is correct.
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by the voice coil. The field from the voice coil otherwise adds and subtracts from the field in the gap (created by the permanent magnet).
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Good picture, notice the clear slit in the aluminium bobbin to minimise eddy current losses/heating.
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172:(equivalent to cone displacement with a linear compliance) is proportional to the
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Are you referring to how speakers sometimes "thump" upon power-up (of the amp)?
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Does anyone know what this highly scientific term means and what causes it?--
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Probably thats what the author meant (an effect due to excessive current).--
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Take ya two and a half years to choreograph that photo right :)
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I just entered in this line,from a
Chinese girl Hailey.
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I wonder if it is a real problem or my imagination.
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disconnected during power-up to mask this behaviour.
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