@rbstehno When people talk about diamond tweeters they are talking about condensed vaporized diamond. The DMD drivers in the Ushers are just ceramic tweeters, just like their BE line is nothing more than titanium tweeters.
beryllium vs diamond
Hi guys, today's technology has brought us a new type of tweeter made of diamond or beryllium. Do you know what are the strengths and weaknesses of diamond vs beryllium? Which one is the more expensive? Has today's dome tweeter better resolving power than the venerable electrostat? Jim Thiel once said that dynamic designs will be getting better all the time and will probably surpass electrostatic designs.