Originally Posted by billatlakegeorge /forum/post/0
Obviously I can't tell by looking.
I do have a multimeter, just not sure what to do with it.
You use it to check the continuity of the voice call and leads, that is to determine if the circuit is continuous from terminal to terminal on the driver.
You use it to check the DC resistance of the voice coil. Most drivers have a nominal impedance (AC resistance) of between 4 and 8 ohms. The DC resistance will be about 3 to 6 ohms.
Set your meter on the lowest DC resistance range. Connect a probe to each of the driver's terminals. Read the resistance. An infinite reading means that the voice coil wire is open, burned out most likely. The tweeter can now be used as a fridge magnet.
A reading of 4 or more ohms tells you that the wire probably OK, but not that the tweeter is in good shape. There may be mechanical damage or adhesive failure that prevents the voice coil/diaphram from moving normally. It is also possible that one of the turns of wire has shorted to another, lowering the resistance, and wrecking the tweeter.
There is a slim chance that the crossover has failed. If you get continuity then the easiest thing is to swap tweeters to diagnose the problem.
Tweeter damage is almost always catastrophic
and almost always the result of two much power.