I believe these are the Western Electric 300Bs of Tweeters! I doesn't get much better, testimony to Extrema and the fact a new pair of same tweeters sold for 1400. on A'gon recently-
You have to remember that any speaker brand other than Dynaudio that uses the Esotar tweeter uses the older T330D, only Dynaudio C-1's and Special 25's use the much more refined version called the Esotar 2.
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