New Fischer & Fischer Audio 670 Speakers : Made Out Of SLATE..

show me a piano or a slate violin..?
as well as glass, aluminum - all this makes the sound clinically sterile ... The body must vibrate - the materials of the body must be close to the materials of musical instruments - you will get the right tone

https://www.youtube.com/watch?v=pg9eUTQFkIM 

The music surrounds you like at Live Event 😃😊

Here's their Entry Level Speakers made of Slate  😀😊

https://www.youtube.com/watch?v=4ZgFKrefcoM

"From his extensive studies at a local University, he concluded that SLATE WAS INDEED THE VERY BEST MATERIAL FOR SPEAKER CABINETRY" 😃😊

https://www.soundstageaustralia.com/index.php/reviews/409-fischer-fischer-snsl-370amt-loudspeakers

Where is kenjit when he could be useful?