They are old versions of the smaller ESS air motion transformers. Sensitivity is pretty high at around 95 to 96 db/2.83V/m. Impedance is constantly flat around 6 ohms.
The newer ones have a lower impedance and lower efficiency but can also be crossed lower also a lower.
I have measured them and used them and can advise you that they do need some form of correction. Without correction they sound a bit harsh with little top end extension. Onces smoothed out (notch filter for the bump between 7Khz and 13Khz) they sound pretty good, at least better than most dome tweeter I have heard, but I can advise a crossover frequency of at least 4kHz, lower is possible but higher sounds better.
The newer ones have a lower impedance and lower efficiency but can also be crossed lower also a lower.
I have measured them and used them and can advise you that they do need some form of correction. Without correction they sound a bit harsh with little top end extension. Onces smoothed out (notch filter for the bump between 7Khz and 13Khz) they sound pretty good, at least better than most dome tweeter I have heard, but I can advise a crossover frequency of at least 4kHz, lower is possible but higher sounds better.
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