I have yet to hear any tweeter that surpasses the Dynaudio Esotar. my two cents.

It ain't the materials that make a great driver, it's what the designer does with those materials that counts.

i have a set of Dalis. They use a dome tweeter (don't know the material) only up to 12,000hz and a ribbon above that. To my ears, the sound is more relaxed because the dome is not straining to get to 20k hz and can be tuned in a more relaxed manner in its range with the ribbon taking care of all overtones. it seems a lodgical system.

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It ain't the materials that make a great driver, it's what the designer does with those materials that counts.

I agree with Jan. B & W has Diamond which sounds great, beryllium does as well and used by many manufactures, cloth, aluminum, silk, and the list could go on, including paper tweeters of various shapes. People not using diamond claim it has too much mass, but the B&Ws sure sound find to me as do the metal domes made by many.

The rage of woofer material seems almost endless concoctions of paper, kevlar, plastic, more endless possibilities.

Because of great engineering manufacturers have overcome so much to make some unbelievable sounding products for us to enjoy. Jan is right...there is more than one way to skin a cat.

We didn't even touch on the efforts of Dave Wilson and how he agonizes over cabinet material! Could his speakers be as great as they are without it? Probably not.