Concrete Audio Speakers...Speaker Enclosures made out of Concrete ?..

So if I design a piece of junk speaker but enclose it in concrete what will make it sound better?  Lets 

What about acora's granite speakers? Lot of people swear by them!

https://www.acoraacoustics.com/src-1

How to make your own concrete speaker boxes...five part video
 
 https://www.youtube.com/watch?v=kf2zkd5SAZU&list=PLycL7IZk1IZk1IfKmUbsd4870ooVKHcIhdt  
 

 

Rauna from Norway or Sweden made transmission line speakers made from Concrete about 40 years ago, they did sound pretty good for their time. Danish Advance Loudspeakers also made concrete enclosures back then. Both companies used a fiber filled concrete and  the walls were about 2" thick,  so very little "ringing". I'ts all in the implementation. The biggest issue both had was the the alkaline that constantly seep out of the concrete would cause any finish applied to them to peel off. I think this was the main reason they quit doing it.

Good Listening

Peter

Has anyone heard these?  I would find opinions intriguing.  I moved my system from our main room which has polished concrete floors into another area where I put down an engineered product over the concrete with immediate improvement in sound quality.  Just trying to think about how to abstract one into another.  Not sure.  I suspect the book shelf on stands vs the floor standers vs the wall mounts would all sound completely different given the contact points but uncertain.  Very interesting concept.