These guys even make CVD-D (artificial diamond) iems. That shall not suck. - what human kind has learned from tweeters: Al ~ Mg ~ Ti ~ soft membranes < TiN coated stuff ~ fancy carbon that is not CVD-D ~ sapphire << Be << Diamond.
Doesn't the campfire high end DD iem use an ADLC coated diaphragm? In iems, so far we haven't seen vastly superior results yet. Maybe it's because the tech is not mature and you need different thicknesses of coating along the radius of the diaphragm.
Also, crucially, it would take custom housing plus holtzman resonators to best shape the sound. As we saw with Dunu, they aren't willing to invest in that to make a great iem.
CF: Using our signature A.D.L.C. (amorphous diamond-like carbon) coating material .. reads like it's a coating on top of aluminum or Mylar or smth, ie not the bulk material itself. The base material roughly has as much it's own sound as the ratio of weight to the coating would be. Well, with speaker drivers it is so.
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