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My measurements of the tweeter. Very close to manufacturer spec. Including off axis up to 70 degrees. Of course my diy equipment is not 100% accurate, but it does give a good picture of what is going on.
One think to note is that my measurements are not reliable above about 17kHz, so I would not notice high frequency resonances etc. But I don't expect any of that with this tweeter.
Anyway, good to notice is that the tweeter is rolling off very nice and uniform.