I so enjoy "the older material" Skaaning midrange drivers used in my loudspeakers. I suspect (with tongue firmly in cheek) the implementation must overcome their polypropylene pedigree.
Keeping to topic, my loudspeakers implement Accuton diamond tweeters (BD30). Years back I owned loudspeakers using the Accuton BD20. To me, the Accuton diamond membrane sonic character doesn't stand out in the sense of immediately calling attention to itself in a "oh, wow!" kind of way. Given the cost, my initial expectation was that it would. It's positive attributes are, really, quite subtle. It is as if the treble content of music simply flows. Complex treble content from multiple instruments retains the separateness of the individual instruments to an extent I've not heard with ceramic, ribbon, or soft dome tweeters. Clarity of ceramic and ribbons, but with an ease that is hard to describe.
I've never heard loudspeakers with beryllium tweeters, so cannot offer an opinion on similarities/differences versus diamond membrane.
Keeping to topic, my loudspeakers implement Accuton diamond tweeters (BD30). Years back I owned loudspeakers using the Accuton BD20. To me, the Accuton diamond membrane sonic character doesn't stand out in the sense of immediately calling attention to itself in a "oh, wow!" kind of way. Given the cost, my initial expectation was that it would. It's positive attributes are, really, quite subtle. It is as if the treble content of music simply flows. Complex treble content from multiple instruments retains the separateness of the individual instruments to an extent I've not heard with ceramic, ribbon, or soft dome tweeters. Clarity of ceramic and ribbons, but with an ease that is hard to describe.
I've never heard loudspeakers with beryllium tweeters, so cannot offer an opinion on similarities/differences versus diamond membrane.