Bertagni speaker

[u301021]

I have studied these funny Bertagni speakers which consist of a magnet / voice coil and a polystyrene plate.
But I can not really figure out if the polystyrene is completely attached to the frame or if there is some kind of surround foam

Does the polystyrene move more at the voice coil than out at the edge of the frame?

I think it's a fun speaker and would love to try make something similar

Video = (See 11:30 and 21:10 in the video)

Bertagni Electroacoustic Systems - Caixas de som planas (Plain Speaker Systems) - YouTube

 

[celef]

oes the polystyrene move more at the voice coil than out at the edge of the frame

I would think so yes

Does not sony do this with their oled tvs too, exiters attached directly to the oled glas panel, with heavy equalization it should give a nice flat response

 

[forr]

I would think so yes
Does not sony do this with their oled tvs too, exiters attached directly to the oled glas panel, with heavy equalization it should give a nice flat response

You may think of Yamaha :

Vintage YAMAHA Speaker Woofer Flat Ear Driver JA-5002 | #130512447

 

[celef]

No i do think of sony 🙂 i believe they call it ’acoustic surface audio’