All of these brands make beryllium drivers, so they know how to design and build with that material.
Maybe they or someone they know are willing help perfect our cloned diaphragm and do small runs of them.
https://sbacoustics.com/?post_type=product&s=beryllium
https://www.eighteensound.it/en/products/hf-driver/1-5/8/ND4015BE
https://www.masterdynamic.com/blogs/know-your-sound-tool/know-your-sound-tool-beryllium-drivers
https://www.focal.com/technologies/the-beryllium-tweeter
https://www.materion.com/en/product...ryllium-products/truextent-acoustic-beryllium
https://vue-audiotechnik.com/beryllium/the-use-of-beryllium-in-transducers/
https://www.paradigm.com/en/passive/persona-b
https://www.revelspeakers.com/info/series-performabe.html
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I guess that the black stuff seems to be epoxy coating used by MeyerSound to hardned the Yamaha diaphragm.
on
you wrote
"Meyer was using the original diaphragms but they limited the excursion by
applying epoxy or the likes to the surround fingers. This had a bit of a negative effect on the sound.
Look at the pic:"
Hi,
I already tried to remove and replace, even to change the driver but always the same Z response.
I will try the hear and measure a tone when loosing/screwing the dia.
What Meyer Sound did was an even distribution on the fingers with an opague (slightly pinkish) Epoxy. Look at the linked Pics again.
I know it is hard to swallow, but these are poorly "repaired" Diaphragms. Repaired is not even the right word, covered up damage describes it better.
If you still can, get your Money Back.
I know it is hard to swallow, but these are poorly "repaired" Diaphragms. Repaired is not even the right word, covered up damage describes it better.
If you still can, get your Money Back.
Angry to read that Radian, 
I think my seller will not want to reimburse me, because he already said that the drivers had been checked by a specialist in Belgium and he paid him €175 for that. Today I tried to realign the VC by checking the impedance curve: it's much better, the curve is clearer but the peak value is only 34Ohm instead of 60 and the Fs is 530Hz instead of 400. The other is still OK. I have to set up a listening set (bass, filter, etc.) to really check their sound compared to the originals.
I think my seller will not want to reimburse me, because he already said that the drivers had been checked by a specialist in Belgium and he paid him €175 for that. Today I tried to realign the VC by checking the impedance curve: it's much better, the curve is clearer but the peak value is only 34Ohm instead of 60 and the Fs is 530Hz instead of 400. The other is still OK. I have to set up a listening set (bass, filter, etc.) to really check their sound compared to the originals.
Check your messages. Will also add this one to the list, though they may not have the engineering staff to do any prototyping. https://www.simplyspeakers.com/