The Whole Truth About Beryllium Diaphragms

[gtforme00]

Fair enough, but what if the cone were 98% paper and 2% kevlar, and the manufacturer told you it was "Kevlar".

Even though Mr. Mowry has an interest to protect, I am glad that he is exposing this issue for what it is. If the end product is better loudspeakers for us to play with, then I am grateful.

Have you looked at the STEALLUS motor design, it's quite remarkable, I wonder when a driver based on it will be available.

-David

[soongsc]

Originally posted by DcibeL
I think most people who buy Be or diamond diaphragm speakers are paying a huge price premium just so they can tell their friends that they have some very exotic Be or diamond speaker. It's too bad there have been some false claims made by manufacturers to make a few bucks because people do buy into Be just because it's Be.



Fact? Soongsc, can you point me to some measurements or some data that could help prove your point? How can aluminum 1" tweeter with breakup at 25-30kHz have harsh sound? We don't hear the breakup, and for any harmonic distortion that propagates lower in frequency, the harmonic occurs at the breakup frequency which is above audible range. I don't see why the breakup must be above 50kHz, for me as long as it is above audible range there is no problem.

If you ever drop by Taiwan, I'd be glad to entertain you with the details. But you have to be here to hear it. I have already demonstrated to a few people here.

[mowry]

What's the difference between a 28mm Aluminum Dome Tweeter and a 28mm Truextent Acoustic Grade Be Dome Tweeter to the driver manufacturer?

About US$30.00 per Tweeter unless the assembly builds poorly and the reject rates are high.

[Pano]

Steve, I sent you your doc in PDF format a couple of days ago. Thought you might like to post it. Did you ever get it? Easier and smaller than the zipped docx file.

Thanks for the post and the info!

[Ron E]

Originally posted by BHTX
Yeah, I was hoping this wasn't the case, but I'm not surprised. Compatibility between office suites and word processing apps etc has always been an existing problem. I used to use Open Office, but always had problems with it. I've had MS Office 2003 (and all the rest before it) as well, and couldn't stand it.

I've never had an issue with compatibility between Open Office and Excel, except when the Excel doc included VBA code. If you want to keep folks with open office from mucking about with your spreadsheet, put in some VBA, It's a feature, not a bug

I use open office almost exclusively, but have an old version of excel for times when open office doesn't cut it - mostly this is when open office's charting problems rear their ugly head.....

[jupiterjune]

Steve-

Great article! Thank you.

JJ

[LaMa]

Originally posted by gtforme00

Have you looked at the STEALLUS motor design, it's quite remarkable, I wonder when a driver based on it will be available.

As well as some real world results on actual performance. The engineering effort which went in these designs seems very advanced and the simulations are very elaborate, but proof is in the performance of the actual drivers.

[mowry]

Usher Audio says.

We are very happy to have Dr. Joseph D'Appolito as Usher’s technical consultant since early 2000. A world-renowned authority in audio and acoustics, he specializes in loudspeaker system design with credentials galore: BEE, SMEE, EE and Ph.D., degrees from RPI, MIT and the University of Massachusetts. As a member of the Audio Engineering Society, Dr. D'Appolito has published over 30 journal and conference papers. His most popular and influential brainchild has to be the MTM (midrange/tweeter/midrange vertical array) commonly known as the D'Appolito Configuration that’s used by dozens of manufacturers throughout the world.

[augerpro]

Originally posted by mowry
Usher Audio says.

We are very happy to have Dr. Joseph D'Appolito as Usher’s technical consultant since early 2000. A world-renowned authority in audio and acoustics, he specializes in loudspeaker system design with credentials galore: BEE, SMEE, EE and Ph.D., degrees from RPI, MIT and the University of Massachusetts. As a member of the Audio Engineering Society, Dr. D'Appolito has published over 30 journal and conference papers. His most popular and influential brainchild has to be the MTM (midrange/tweeter/midrange vertical array) commonly known as the D'Appolito Configuration that’s used by dozens of manufacturers throughout the world.

And?

[DcibeL]

Indeed. That exact text is on the "company information" page on Usher's website. What is it's relevance to the topic of Be diaphragm material?