Omnidirectional tweeter

[moschfet]

Does anyone know of a loudspeaker that works according to this principle:

A voice coil works against a cylindrical accordion. The 'accordion' is of course fixed at the top. In principle an omnidirectional AMT.

The cylinder below is a voice coil.

 

[adason]

No. But pioneer used to make omnidirectional tweeter with reflective circles looking similarly.

I do not understand how that makes AMT. How do you make accordion constrict like amt if there is no current going through.

 

[moschfet]

It is similar to AMT, but not the same.
The folds are pressed together and the air between them is pushed out using a lever. An AMT does nothing different.

 

[stv]

How do you make accordion constrict like amt

There is a "classic" voice coil below.

There will be a difficulty to get the accordion flexible enough to allow "breathing" but still stiff enough to push air. But maybe it's just a question of geometry?

 

[moschfet]

Yes, thank you...I forgot to mention

 

[atarashi]

No, but I think this is close:
https://audioxpress.com/article/new-transducer-technology-from-christensen-audio

 

[mattstat]

There's no pleating in MBL's radialstrahler, but the basic drive principle is the same.

https://www.mbl.de/en/loudspeakers
Every Radialstrahler chassis consists of individual petal-like segments, known as lamellae, which are arranged in a circle around a central axis, resulting in an elongated spherical shape. Each individual lamella is permanently fixed at its upper end and attached to a voice coil at the lower end, moving freely in and out of the magnetized gap.