Mike
Can you measure Impedance with an Ohm Meter

Which begs another question: will playing normal audio material through a
speaker, and measuring the ac voltage and current match the nominal impedence
reasonably well, say within 10%?

We used to measure voice coil and other audio impedance by inserting a low ohm
resistor in series with the load. We did have an idea of the actual impedance.
We onfirmed this by reading the voltage across the resistor. We also checked
the procedure by using actual carbon resistors to "calibrate" the procedure.
Bob AZ