beryllium diaphragm VS titanium diaphragm

[oltos]

There are so many other factors than dome material that I find this difficult.

But here are the two 34mm BlieSMA tweeters that are exciting people. Slightly different dome profiles, the AL being more rounded.

Beryllium gains on the higher first resonance at 32kHz rather than 27kHz and 1.5dB more efficiency. The frequency response and off-axis dispersion looks more a function of dome profile.

But not the smoking gun to say expensive and toxic beryllium is a compelling buy IMO. Titanium has its uses too, it is tougher for high power applications apparently.

SB Acoustics are doing interesting things with anodised Aluminium, which they call ceramic, and diffusors and flatter profiles which look good at the price too. But really, what's not to like about the affordable 1" SB26ADC?

All three illustrations are non-ferrofluid designs, BTW.

But might there be some situations where a driver with an aluminum diaphragm-the OOP Yamaha JA6681B, for example-might be preferable over the Radian 745Be?

 

[Freedom666]

If you use origami style structured cones you get much greater stiffness for free.

Here Acoustic Research hires series alike JBL titanium from the 80ies

Fostex fe 208 with structured cone

Thin aluminium foil applied diy makes it more stiff

https://www.diyaudio.com/community/...loudspeaker-sandwich-cone.402917/post-7443469