Originally Posted by Wiki
Beryllium increases hardness and resistance to corrosion when alloyed with aluminium, cobalt, copper (notably beryllium copper), iron and nickel.[3] In structural applications, high flexural rigidity, thermal stability, thermal conductivity and low density (1.85 times that of water) make beryllium a quality aerospace material for high-speed aircraft, missiles, spacecraft, and communication satellites
It mentions missiles... no mention of tweeters though ... grin


861v4 LPSU, HD621, Bryston 9BSST
KEF Reference 3 and 2c, 2 X SVS SB13 ULTRA
Audio PC: JPLay, LPSU, JCAT, PPA Studio
Cables XLO Limited, Unlimited Edition and Signature
Sony VW500 Isotek Titan, DIY Mains and Clean Signal Earth Solution