Talk:Voice coil

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the cone has been known to tear off the cone????

[edit] Voltage and current in loudspeaker coils

The cone force (equivalent to cone displacement with a linear compliance) is proportional to the current. The induced (terminal) emf is proportional to the coil velocity. See Lenz law and Flemings rules.--Light current 17:39, 26 February 2006 (UTC)

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.
Atlant 19:59, 26 February 2006 (UTC)

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) --Light current 20:54, 26 February 2006 (UTC)

[edit] Thumping noise

Does anyone know what this highly scientific term means and what causes it?--Light current 21:19, 4 March 2006 (UTC)

Are you referring to how speakers sometimes "thump" upon power-up (of the amp)?
Atlant 02:29, 5 March 2006 (UTC)

Probably thats what the author meant (an effect due to excessive current).--Light current 02:33, 5 March 2006 (UTC)

[edit] aluminum rings

"Some magnet designs include aluminium rings above and below the magnet gap, to improve conduction cooling, significantly improving power handling."

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 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). Marvin Glenn 08:38, 9 October 2007 (UTC)