if you want music, you should think twice about Avalon. I have not heard any ceramic midrange speakers to sound natural over the long haul. diamond tweeter or not, most critical is midrange and ceramic is just not the right material to many people's ears. what is ceramic? ceramic is essetially aluminum oxide and how often do you see aluminum used for midrange now a day? people have learned the disadvantage of aluminum midrange and stop using it long ago.
but Beryllium is a different story, I love the way Usher BE makes music in midrange.
a lot of things look good on paper, but they don't necessarily sound good in real life. I have heard Marten Design, Avalon, Lumen White, Gryphon, and Tidal extensively, all use ceramic midrange, all left me cold after half an hour.