Today I had the luck to listening to this prototype once more. I played my own familiar CD's and this time a decent camera took care of the pictures.
I just can confirm my earlier impression. These speaker sounds very good. The new Thiel membranes have extremely low distorsion and the sound of this speaker is warm, jet open and fresh. I have never heard so much from the recording and it's environment as this time. I think this is my new standard that every speaker i listen to have to beat.
Here are some new pictures.
Two diamond tweeters:
Thiel membranes with dimples:
4 of them:
Alone:
This membrane moves more air then you think due to that it goes further out to the edge.
Edit: Foto enhancement.