Originally Posted by sferic
"This fluctuating field works against the steady/stationary magnetic field created by the permanent magnet and causes the ribbon or voice coil to move the air in concert with the fluctuating audio signal."
Talk me thru this, just trying to understand... so in electrostatics, my understanding is the membrane is steadily charged (like permanent magnets in Heil's etc.) But the grids on either side fluctuate with the signal according to electromagnetic principles of repulsion/attraction. Is that right? So, isn't that membrane with conductive material deposited on it, kinda sorta like an electromagnet?
That's close, but it's electrostatic attraction and repulsion, not electromagnetic, virtually all of today's stats apply the bias (stationary, non fluctuating) voltage to the diaphragm and apply a complimentary balanced audio signal to the stators. As the signal fluctuates, the statically charged diaphragm is either attracted or repulsed from the stators electrostatically. Since the signal to the stators is complimentary, one stator will always be attracting the diaphragm and the other will always be repelling it.
Static electricity, as the name implies, is static, that is, potentials are there, but no current flows between them. Electrostatic attraction is easily demonstrated by rubbing a balloon on your hair inside the warm house when it is very cold outside. The humidity is low so when the balloon is rubbed, static charge builds up on the surface of the balloon. When you bring the charged balloon near a wall it typically is attracted to the wall and will stay "stuck" to the wall, until one discharges the static charge on the balloon.
Edited by kwkarth - 3/25/11 at 10:58pm