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)