I had the idea that it might be possible to measure the linear displacement of an unknown driver by hooking up the voice coil to an inductance meter and displacing the membrane statically. I thought that if one end of the coil left the gap, the inductance decreases.
Turns out the inductance increases for any inward movement, even if unrealistically far, and decreases for any outward movement. My interpretation is that this is due to the center pole piece filling more or less of the coil area or its stray field. The air gap itself does not seem to have much influence.
Eric
Turns out the inductance increases for any inward movement, even if unrealistically far, and decreases for any outward movement. My interpretation is that this is due to the center pole piece filling more or less of the coil area or its stray field. The air gap itself does not seem to have much influence.
Eric