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Nigel Thomson
 
Posts: n/a
Default Q: Speaker inductance measurement

I found a formula for calculating speaker inductance but its a little
unclear to me, is this right?

\ /---------------
\/ M * M - Re * Re / 2Pi
------------------------
frequency

so its the root of (M*M-Re*Re),
divided by (2*Pi),
divided by the frequency?

Where (M) is the impedance Magnitude.

It says, obtain (M) like this:

* Connect an amplifier and frequency generator set to 1000Hz and put a
10 ohm resistor on the output.

* Adjust the gain on the amplifier and frequency generator until you
get 10 V.A.C.

* Remove the resistor and connect the speaker.

* Set the frequency at the drivers highest usable frequency.

* The voltmeter reading is the driver's impedance magnitude (M) for
this frequency.

What is the "drivers highest usable frequency" anyway? ZMax?

Its my understanding that the inductance should be obtained at 1000Hz,
is this what I want?


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