Um, not to crash the party here, but doesn't putting a vibrating sheet of a neurotoxic metal like beryllium directly next to your head strike anyone as a bit of a questionable design choice? Many speakers with beryllium tweeters carry warnings that if the tweeters are shattered you will be inhaling toxic dust. Shattering can apparently be triggered by simply overloading the speaker.
http://audiokarma.org/forums/index.php?threads/beryllium-in-speakers-is-it-safe.678190/ (See the NS2000 reference on this page)
Once in your body, beryllium cannot be removed.
https://en.wikipedia.org/wiki/Beryllium
So I guess I would ask... what safety precautions are in place so that audiophiles aren't one accidental high gain knob turn away from being poisoned?