Thank you for your replies!
Yes they are polypropylene cones. It's good to hear that they are popular! I am looking forward to listening to them!
I have but I don't know if they are suitable for a home theater environment because of their narrow vertical dispersion. I heard both expensive and cheaper AMTs and Ribbons, I wasn't too impressed with the cheaper ones and the expensive ones sounded nice but also cost over 400 euros...
Yes it is
Thank you for the recommendations! No he is not building me drives, he just recommended me drivers in different price points one of which was made by scanspeak.
He did select the drivers based on performance and he talked to me about their response but I was probably obsessed about cone material because of my lack of listening experience... Since I can't tell what I should be looking for when I am listening to different drives, I thought doing some research on cone materials (which I though it was the most important part) would help me choose.
The rates in my country are lower so even though it will be a lot more expensive that a DIY project It will still cost me less than buying a branded speaker and as a bonus I will be able to choose the design and parts of the speakers.
I listened to a couple of his speakers and they are significantly better than similar (and more expensive) branded speakers I listened to. Also, he is well known and I heard many good things about him so it's really easy for me to trust him