On October 29, 2019 at 08:02, Fins said...
I’m pretty sure this has been discussed before, but I don’t remember the answer. Can you measure the impedance of a speaker with a standard multimeter? If not, then how can you do it?
You can measure the voltage drop across a resistor at a fixed frequency, but it's not possible to easily measure actual impedance. You can measure the DC resistance and get a ballpark idea of the total, though- an 8 Ohm speaker will measure roughly 6 Ohms when a multi-meter is used.
Parts Express had a piece called WT-3 (now upgraded to the DATS v3) and it will gather the Thiel-Small parameters, including an impedance plot. If you have a wholesale account, it knocks a bit off of the price. I have the old WT3 and it has been very useful when working with drivers that were made before the parameters were widely used, or when the data is hard to find.
[Link: parts-express.com]
