"I don't take anything for granite..." (Sorry, and Yes, too easy...)
I made a pair of ceramic speakers (porcelain) a long while ago....fun concept, lousy in use....*shrug* Resonates...but they were small....
Fibre concrete will allow thinner walls, saving weight. Flip side requires very careful design as the stronger structure will start to resonate.
Foamed concrete hasn't been tried to my knowledge. But may have the same issues as ceramics. The mass reduces, the weight as well....allowing for the excitation of the enclosure.....
...and foamed materials generally require casting.....big$....
I made a pair of ceramic speakers (porcelain) a long while ago....fun concept, lousy in use....*shrug* Resonates...but they were small....
Fibre concrete will allow thinner walls, saving weight. Flip side requires very careful design as the stronger structure will start to resonate.
Foamed concrete hasn't been tried to my knowledge. But may have the same issues as ceramics. The mass reduces, the weight as well....allowing for the excitation of the enclosure.....
...and foamed materials generally require casting.....big$....