It is actually a game of reflections, said Mark. You need to shape the room to limit the volume of the reflected sound against the direct sound from the stage. The shape of the hall and the wooden walls balance different frequencies for each listener. Kristen can take you and Gaia to a performance in one of Berlin’s halls. If you are able to get there early, you should look around. Everything was built in place, with no blueprints. Walls are tilted at different angles every few feet.