Diamond tweeters, perhaps?
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I think it’s silly to lump together the ridiculous jewel encrusted ones with headphones that represent an earnest all-out-assault on state of the art sound quality. Different markets, different use cases. Also many recent (and earnest) flagships are conspicuously absent from this list, like HiFiMan Shangri-La, Spirit Torino Valkyria Titanium, Stax SR-X9000, and Warwick Aperio.