Bonjour Laurentgilles,
I haven't heard any Fertins but I've heard several Supravox drivers, and own one pair of Supravox drivers. They have been represented here in the US for a few years now.
I presume the 20EX is a 200 millimeter field coil driver. Is that correct? Is it really $3,000.00 each, or is that for a pair? Either way, that's higher than the comparable Supravox driver. Perhaps the Fertin is better, I don't know.
Hey I understand your being enthusiastic about something you sincerely believe in. I am sure you would not have made the huge financial commitment necessary to import the drivers if you didn't believe in them; there are much more profitable things to sink your money into than importing expensive specialty loudspeaker units!
Where are you located? Your name sounds French to me. Do you have a website? Or, can you give me a link to the French website?
It's unlikely that I'll become a customer of yours since I'm working on some projects of my own, but I'm always fascinated by specialty loudspeakers. I'm glad to see that Fertin is now represented in North America.
Best of luck to you.
Duke