Originally Posted by
Uncle Paul
Thanks, Giskard!
Now that you say it, having the impedance curve is obvious - if you don't know the impedance at the crossover frequency then it's just a guess. Thanks also for pointing out that the horn needs to be attached to the LE85 for an accurate measurement.
Simplist way I can think of is to put a suitable measured resistor in series with the transducer and hook up to an audio signal generator & amp. Then measure the rms voltage across it and the transducer as the frequency is changed. Then use Ohm's Law to determine the actual impedance based on the rms voltage measurements.
Of course, being careful to use frequencies and amplitudes that won't cause damage!
Any better, simpler, easier way or suggestions?