2. speakers
  3. 148984-20253

Gobel and the Bending Wave

An article at Stereophile regarding the Gobel Divin Noblesse speaker caught my eye recently:

https://www.stereophile.com/content/g%C3%B6bel-loudspeakers-cables-engstr%C3%B6m-pre-and-power-wadax...


Jason Victor Serinus made a simple mistake and listed the AMT tweeter as a "bending wave" transducer. He's corrected the error, but the "fix" was just as curious. According to the Gobel website, and JVS's correction, the midrange drivers, which for all the world look like FaitalPro 8" mids to me are "bending wave" transducers in this model.


http://www.goebel-highend.de/products/divin-noblesse.html


These midranges look nothing like the bending wave planar transducers used in the Epoque line, or described by their technology page here:

http://www.goebel-highend.de/technology.html

So, without being able to order and disassemble these $190K speakers, I'm really skeptical that this description of the midrange drivers is accurate.


That is all,

Erik
erik_squires
mapman's avatar
mapman
22,980 posts
 
That’s fine theoretically but in practice the bottom ported Ohm Walsh driver produces sound both pistonically and via wave bending at the same time.  
nonoise's avatar
nonoise
11,226 posts
 
I didn't know Lonesome George Goebel could surf.
erik_squires OP
16,900 posts
 
That’s fine theoretically but in practice the bottom ported Ohm Walsh driver produces sound both pistonically and via wave bending at the same time
.  

But not at the same frequencies. That's what I mean by simultaneously. It is a bending wave transducer to a point, below which it becomes pistonic.

mapman's avatar
mapman
22,980 posts
 
Yes that's it.  

atmasphere's avatar
atmasphere
12,177 posts
 
Sorry, AMT is not bending wave, Atmasphere. It's motion is pistonic, although at an angle. :)

IMHO, to be a bending wave, the transducer must be excited at one end, and have the sound wave emit off the surface as the wave travels from one end to the other, or from a central point to the edge.
The Linaeum tweeter is a flexible membrane and is excited at the center with the sound wave emitting off the surface as the wave travels from the center to the edge. I have a set- and they are very similar to the High Emotion Audio tweeter. I've spoken directly to the engineer that designed the latter (Mike Shields) who said that his design is a bending wave and also similar to the Linaeum. So what am I missing? Is the Linaeum tweeter not also the AMT?
More to discover