[MrFixr55]

These are generally high impedance (in the order of 500 Ohm - 2 KOhm). Ohm it. if very low, remove the capacitor. it may be suffering from silver mica disease.a 1.5V battery can be used to click test it. If you have an output transformer from an AA5, hook the secondary to an amp and the primary to the speaker wires. Slowly turn up the volume. Of course, you can test it with a signal generator. These speakers are certainly not high fidelity.

If hooking up to an antique radio where the speaker connects between the output tube plate and B+ then polarity is important. The wrong polarity will demagnetize the magnet. If it is cap coupled or transformer coupled, then this is not an issue.

Good luck.