Originally Posted by Trev@Circle
cast walls? Nice! Keep up the good work!
Yes, the walls are all poured concrete - in fact the roof is poured concrete as well, so the entire building is essentially a monolithic concrete structure.
This is a very common building method in Europe, and not just for commercial structures. As we were discussing building methods and materials, this came up as a viable and sensible alternative, since it's cost effective and obviously offers excellent sound isolation.
The trick of course with concrete structures is you've got to get your modal ratios right, and the bass trapping has to be effective at very low frequencies, since very little low fequency energy is able to escape the building walls.