What Beyma did was marry the Ti diaphragm with a Mylar surround to reduce breakup. The highs are quite pure and smooth as a result. Radian does the same with their Aluminum diaphragms.
That makes sense! Most of the "noise and hash" is from the surround. The 435Be and Al, 2435 and 2431's also use a mylar surround and it works.
Rob