berylium tweeters question.

marchel · 25th November 2007, 02:06 PM

Hello to all,

I have a few question regarding berylium tweeters,

Is the usher berylium tweeter available on sale anywhere, In raw form?

Is there any other manufacturer that sells berylium tweeters , currently available for DIYers?

Has anyone here , heard berylium tweeters, Particularly from focal and usher. How do they differ from a high-end soft dome tweeter in subjective sound quality?

Are they (berylium tweeters) sound so good that they're worth their price? ( Around 1,000 usd each, I pressume.)

Thank you.

454Casull · 26th November 2007, 12:45 AM

TAD, Goto, and JBL sell beryllium tweets, but JBL's may be a little hard to find.

tinitus · 26th November 2007, 02:08 AM

I believe that berylium has been "banned", at least in Japan so even Goto is now using titanium ... so prices may go up on used berylium drivers

el`Ol · 26th November 2007, 02:54 AM

Export of Beryllium is prohibited, so the Beryllium versions of the Gotos are for the domestic market only. Does that mean TADs are not manufactured in Japan?

Cloth Ears · 26th November 2007, 04:42 AM

Beryllium oxide is one of the most poisonous substances known (moreso even than MDF...

), so I'm not surprised that their use is becoming restricted. I'm not sure of their actual value over other strong metals like titanium (other than rarity and thus w*** value).

PigletsDad · 26th November 2007, 02:05 PM

Be has atomic number 4 - it is the first stable metal in the periodic table (Lithium is so reactive that it just oxidises away). This makes it very light (density is only 1.85), but its stiffness is pretty good. The net result is that the speed of sound (13000m/s) in Be is higher than any other metal, so for a given geometry, resonances occur at much higher frequencies. The low weight also helps with sensitivity.

For comparison, Ti has density 4.5 and speed of sound 4140m/s.

The only things I can think of that would have a higher speed of sound than Be are diamond (18350m/s) and probably Boron Nitride. Maybe Aluminium Nitride too.

As a metal, Be is much easier to fabricate than diamond.

Tom Brennan · 26th November 2007, 02:11 PM

Be diaphragm JBL 2435 compression drivers are often available on ebay. I never heard a better compression driver. My opinion.

Magnetar · 27th November 2007, 01:22 AM

Quote:

Originally posted by Tom Brennan
Be diaphragm JBL 2435 compression drivers are often available on ebay. I never heard a better compression driver. My opinion.

Hi Tom,

So what waveguides do you have them in?

Robh3606 · 27th November 2007, 02:06 AM

How high do you want to go?? The 2435 is available on Ebay like Tom says however it rolls off a bit above 15K or so. If you want extension above 20K this is not your driver.

Damn nice sounding driver.

Rob

Magnetar · 27th November 2007, 02:20 AM

Quote:

Originally posted by Robh3606
How high do you want to go?? The 2435 is available on Ebay like Tom says however it rolls off a bit above 15K or so. If you want extension above 20K this is not your driver.

Damn nice sounding driver.

Rob

I was pulling his chain. I couldn't live with be driver. No way

25th November 2007, 02:06 PM	#1
marchel diyAudio Member Join Date: Nov 2007	berylium tweeters question. Hello to all, I have a few question regarding berylium tweeters, Is the usher berylium tweeter available on sale anywhere, In raw form? Is there any other manufacturer that sells berylium tweeters , currently available for DIYers? Has anyone here , heard berylium tweeters, Particularly from focal and usher. How do they differ from a high-end soft dome tweeter in subjective sound quality? Are they (berylium tweeters) sound so good that they're worth their price? ( Around 1,000 usd each, I pressume.) Thank you.

26th November 2007, 04:42 AM	#5
Cloth Ears diyAudio Member Join Date: Dec 2001 Location: Melbourne, Australia	Beryllium oxide is one of the most poisonous substances known (moreso even than MDF...), so I'm not surprised that their use is becoming restricted. I'm not sure of their actual value over other strong metals like titanium (other than rarity and thus w*** value). __________________ Jont. "It is impossible to build a fool proof system; because fools are so ingenious."

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26th November 2007, 12:45 AM	#2
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	TAD, Goto, and JBL sell beryllium tweets, but JBL's may be a little hard to find.

26th November 2007, 02:08 AM	#3
tinitus diyAudio Moderator Join Date: Nov 2005	I believe that berylium has been "banned", at least in Japan so even Goto is now using titanium ... so prices may go up on used berylium drivers

26th November 2007, 02:54 AM	#4
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	Export of Beryllium is prohibited, so the Beryllium versions of the Gotos are for the domestic market only. Does that mean TADs are not manufactured in Japan?

26th November 2007, 02:05 PM	#6
PigletsDad diyAudio Member Join Date: Jul 2007 Location: South Worcestershire	Be has atomic number 4 - it is the first stable metal in the periodic table (Lithium is so reactive that it just oxidises away). This makes it very light (density is only 1.85), but its stiffness is pretty good. The net result is that the speed of sound (13000m/s) in Be is higher than any other metal, so for a given geometry, resonances occur at much higher frequencies. The low weight also helps with sensitivity. For comparison, Ti has density 4.5 and speed of sound 4140m/s. The only things I can think of that would have a higher speed of sound than Be are diamond (18350m/s) and probably Boron Nitride. Maybe Aluminium Nitride too. As a metal, Be is much easier to fabricate than diamond.

26th November 2007, 02:11 PM	#7
Tom Brennan diyAudio Member Join Date: Dec 2001 Location: Lexington Ky	Be diaphragm JBL 2435 compression drivers are often available on ebay. I never heard a better compression driver. My opinion.

27th November 2007, 02:06 AM	#9
Robh3606 diyAudio Member Join Date: Nov 2002 Location: Destiny	How high do you want to go?? The 2435 is available on Ebay like Tom says however it rolls off a bit above 15K or so. If you want extension above 20K this is not your driver. Damn nice sounding driver. Rob

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