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You can see that SPL (red curve) shows a pretty smooth plateau from 2 kHz to 20 kHz with a slight drop of 3.5 dB per octave above 12 kHz which is predicted by simulation. This is by the way a reproducible, real-world measurement and not the smoothed and photoshoped curve that is often seen in advertising. You can see the measurements of the first prototype in the diagram below. Diamond tweeters also show a better dispersion and – due to the lower sag height – show lesser phase problems. We used a concave dome as in our ceramic tweeters because the moving part as a whole is more rigid and better damped than convex domes. This is often described as the “ringing” sound of Be cones.Īfter a lot of finite element simulation work and a patent application for diamond tweeters (DE 10049744), we built the first prototype with a small 20mm inverted diamond dome. The internal damping of Berylium however is inferior. Our well established ceramic Al²O³ cone material comes in second best - and - with approximately the same ratio - Beryllium (a toxic substance not used by Accuton). So why is this material desirable for speaker engineers?Ī thin dome of diamond is ideal for a tweeter because the stiffness to weight ratio of this material is unsurpassed, nothing comes close. Peter Koidl that had succeeded in making plain disks of artificial CVD diamond. The inspiration to create a tweeter with a pure diamond membrane came to CEO Adrian Bankewitz in 1999, after reading an article in Scientific American about a group around the physicist Prof.
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Diamond Technology What makes Accuton diamond tweeters so special?