I think it's a brilliant design up to the point that it puts two toxic substances in your home.
Both Lead and Barium are terrible for your health. This is like using Asbestos in your theater. It's fine so long as it doesn't transform into a version that can be inhaled, ingested or absorbed by your skin.
This home theater is a toxic waste hazard in the making.
I'm not even sure that Lead and Barium infused rubber is even legal in the US.