Aluminium floor instead of concrete to help reflect the sound back, interesting.
One thing architects don't really get onto is that noise spreads. They often just think that it is always created at once around the ground at the same time ie like after a goal, a big incident.
Quite often, it starts in one area then spreads to other areas which in turns goes elsewhere, then you hit a point where it reaches a noise level where everyone joins in. One area feeding another. So they need to look closely at that initial area and maximise that.
