Are my " diamond " tweeters really diamond

@soundsrealaudio they’re not real diamonds. diamond tweeters are made of synthetic diamonds that are vaporized on a silicon mould. it’s a vapour depositing process. after the diamond cone is properly hardened, the silicon mould is melted with heat. those are very thin cones and it would be impossible to cut real diamonds like that. as has been previously mentioned, the breakup frequency is pretty high (hence the lower distortions), but a diamond cone has more mass than beryllium and needs a stronger suspension. it means that it probably needs more power and wont’t play lower frequencies as easily as beryllium does.

I just Super Glue diamonds to my tweeters.

The idea of using synthetic diamond is to use an extremely stiff material so that the resonance/breakup frequency is raised up higher than human hearing. I believe the breakup frequency of diamond is around 70khz. I think beryllium could be around 40-45khz. With metal dome tweeters, the breakup is very low, sometimes as low as 22khz. This is why metal dome can sound harsh/bright.

Which is irrelevant, because no one (especially the average 50+ year old audiophile), can hear above 20 kHz. This is why many flagship speakers, some costing 10s of thousands still use basic aluminum domes. 

How the hell did we end up thinking that we needed diamond tweeters???  Of course I can think of several things that people think we need.......

^ It's marketing, pure and simple.