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RE: How t measure the impedance of Ribbon tweeters?

The 3 series (III-3.6) have a 2nd order HP filter, which means there is a shunt inductor across the tweeter. You will need to unsolder one of the connections to measure the impedance. OTOH the 3.3 and above all use the same tweeter (which is the same as the 20.x) and the impedance is 3.0 ohms. The IIIa has a different tweeter and the impedance is 2.2 ohms but this has a 1 ohm series resistor in the network.



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