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Beryllium Tweets

who is buying into the ~~hype~~?
 I mean new is not always better. I think this Beryllium  is all hype. ~~ IF indeed  this tweet was superior to past proven and tried legends,,why are there not videos on Youtube with the ~~goods~~ the proof is in the listening So  far there are no  uploads with a  compare to old Legends. 
I am staying with my Millenium. 
I've read somewhere the Be tweet sounds rather plastic-ity on top end. 
btw we should mention the Be tweet is actually a  mid-tweet which is the best design for a  2 way. 
If someone can make a series of vids comparing the new kidontheblock Beryllium, I ain;t buying in and have this gut feeling its all hyped. 
skaneoil buster here. 
mozartfan
Post removed 
kijanki's avatar
kijanki
4,428 posts
 
Steve Mowry says in the article "The Whole Truth About Beryllium Diaphragms: -

"For a given geometry the first bending (break-up) frequency is proportional to the material Speed Of Sound, where the speed of sound within a material is defined as the square root of the Young's Modulus divided by the Mass Density, (m/s); the higher the better. However, the Mass of the diaphragm must also be considered. Then the ratio of the Speed Of Sound to the Mass Density can be used as the materials acoustic figure of merit, (m4/kg/s); the higher the better."

After that he shows values of "Acoustic Figure of Merit" for different material (higher the better)in m4/kg/s

Beryllium - 6.97
Diamond - 4.92
Aluminum - 1.86
Titanium - 1.13
Steel - 0.63
tomcy6's avatar
tomcy6
2,597 posts
 
Don't be angry at beryllium tweeters.  give them a listen and if you like the speakers, buy them.  If you don't, move on.
auxinput
2,920 posts
 
"Breakup distortion" is exactly the point here.  Soft dome tweeters are great and forgiving, but they are not quite as clean and transparent as hard dome tweeters.  The problem with hard dome / metal dome is the breakup distortion (the point where the material flexes and distorts from the movement).  The breakup point of normal metal domes can range anywhere from 19 khz to 28 khz (on some of the best / treated / coated tweeters).  However, they will still have a bit of a bright edge.

Alternative materials have shown a much higher breakup frequency because the material is stiffer.  I think beryllium is somewhere around 45 khz or something.  Diamond is upwards around 75-80 khz.  I think ceramic is higher in these areas as well, but ceramic also presents a more controlled sound that is usually not as dynamic.

In a recent speaker project, I went from a Seas Excel softdome ($322) to a Seas Excel Berillyum ($770).  The change was night and day. The Beryllium was much cleaner and much more realistic with a higher resolution.  No harshness at all!
yyzsantabarbara
4,882 posts
 
@kijanki I wonder where the new Yamaha NS5000 driver material fits into that list. Yamaha was the first to use  Berylliumin in the 1970's. They are saying that their new material is better than  Beryllium.
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