The deal is that Be is quite toxic if inhaled. There are two principle methods for making speaker diaphragms from Be. The method JBL uses is to use beryllium foil and stamp or draw it into shape. The process that TAD uses is vapor deposition. It is quite toxic, however the final diaphragms are not particularly toxic though it is possible for them to shatter. During the shattering process it is possible to inhale a bit of Be. The beryllium foil JBL uses is less prone to shattering.
Widget
All the handling procedures that I have ever read about Be state not to even touch it.
Allan.
I wouldn't recommend touching any compression driver diaphragm.
As for the health concerns of Be, it would seem that air born particles are the biggest area of concern. I just did a bit of google searching and it appears that even eating Be isn't particularly harmful, as our stomachs and intestines don't absorb Be. Apparently pure beryllium is rather sweet. Personally I don't see much of a future in the in Be chips though.
Widget
You should know what people are like when the see a speaker or a diaphragm, they just want to poke it. They used to test for Be by tasting although it was considered a highly dubious and dangerous testing method.
Allan.
p.s. does this show us that JBL are moving toward Mg for this reason? Maybe it tastes better.
Okay, back to the business at hand, Frank Doris published a very complimentary review of the DD66000 here:
http://hometheaterreview.com/jbl-pro...0-loudspeaker/
He makes very cogent points, especially from someone who sees and hears all kinds of speakers.
Give it a look.
Out.
Do you think?!"Large loudspeakers like the JBL Project Everest DD66000 are capable of reproducing music with a lifelike sense of scale, presence and low-frequency authority that smaller loudspeakers just can't physically deliver."
". . . as you have no doubt noticed, no one told the 4345 that it can't work correctly so it does anyway."—Greg Timbers
They surly got a good test.
I wish I had the room (and the money) they deserve.
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