Thanks for all the ideas.
The first step will be the change of the tweeter.
Afterwards will check the amp parameters.
I am still afraid the finish will be with crossover filter change.
Will keep you posted.
Going back to the first tweeter change. There was some inconsistency in the color of the membrane which can be discovered only with the grill off. I don’t know if it is some problem with the “diamond” coating process or some moisture(condensation) appeared during the transportation process in the winter.
[how can attach a picture in the post here?]
At the time of delivery there was a bit of condensation on the turbine head.
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