So the smaller K-Tubes are 11 mm too long I wonder where the mistake comes from, but printing a new pair is the fastest way to solve this issue. When I am finished with this, I will have plenty of K-Tubes in my workshop Before printing the new pair, I will try to do some basic measurements on the smaller one to see if it works fine, too.
I just ordered 4 cheapo screw on tweeters with horns - Beyma CP-09 sort of clones. They should be reasonably flat above 3 kHz, so they should be a good match to the smaller K-tubes. I will have to design some with a threaded fitting and a small fixing flange or an adapter. More 3D printing fun to come
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