Interesting read, though the format (a Word doc!) is sort of nightmarish.
Bottom line: Focal, Revel, and others do use real Beryllium in their drivers, but Usher and others use metallic blends with trace amounts of Be that have none of Be's special properties whatsoever.
Caveat emptor.
Bottom line: Focal, Revel, and others do use real Beryllium in their drivers, but Usher and others use metallic blends with trace amounts of Be that have none of Be's special properties whatsoever.
Caveat emptor.
