Don't want to repeat what others have said, but, for lifelike piano you have to take your equipment into context.
To over simplify the whole thing, tubes are better for voices, ss for piano. With speakers, very stiff drivers will probably be better, aluminum, ceramic, carbon fiber/rohacell (the best). I do not think a Be tweeter is needed, it's mainly in the midrange where you need "stiffness".
To over simplify the whole thing, tubes are better for voices, ss for piano. With speakers, very stiff drivers will probably be better, aluminum, ceramic, carbon fiber/rohacell (the best). I do not think a Be tweeter is needed, it's mainly in the midrange where you need "stiffness".