Available in Europe, in Poland, used, in very good condition, for approx. USD 2,000
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Which tweeter did your Opals have? Mine were the beryllium-copper ones and they definitely had some brightness. It's possible you find metal dome tweeters fatiguing.
A urban rumor. Metal tweeters mostly don't sound any more bright than a silk or whatever tweeter. If they do it's because they have been tuned that way and not because they are metal.
Metal tweeters are prone to ringing and they can have IMD in the audible band due to severe breakup modes (which also have peaks in the FR). The most common criticism you find with metal tweeters is fatigue. I don't like them myself and prefer silk soft domes.
Strange because ENERGY/Audio Products International a older leading developer of the famous Reference 22 tweeter used silk in a double cone bullet configuration to eliminate what you describe as being problematic with metal dome tweeters.
Yes however that IMD from beyond the audible band can fold in the audible band which can be measured.
See for yourself. Directivity is opening up somewhat in the upper frequencies which could cause some problems with reflections.
www.audiosciencereview.com
Drivers composed of rigid materials with less internal damping / loss will usually exhibit more abrupt and significant breakup modes as they are pushed toward (or hopefully only past) the upper range of their design bandwidth. This happens with tweeters and woofers in similar ways. Metal and Kevlar for example, everything else being equal, have less inherent damping than paper, cloth or silk. The advantage however of ultra rigid and light materials, like beryllium, for tweeters is that the lowest frequency breakup mode can more easily be designed to begin far above the audio range. The Energy 22 “Hyperdome” tweeter as designed by Winslow Burhoe was made from impregnated cotton cloth giving it stiffness while still maintaining damping within the audio range. Burhoe himself has stated that his Hyperdome tweeter inconsequentially looses some linearity beyond the audio range as it continues to exhibit significant ultrasonic response. The Hyperdome design focus was apparently to create a tweeter with an unusually linear and broad range response to accommodate a 1.5k crossover, and minimize any resonances within its audio range.
Typo/autocorrect issue - the first sentence should read: "Drivers composed of rigid materials with less internal damping / loss will usually exhibit more abrupt and significant breakup modes as they are pushed toward (or hopefully not past) the upper range of their design bandwidth." Apparently my original post is no longer editable.
