I visited a nearly privately owned and run Theater & Opera House, the second biggest after the Paris Festival Hall – in Baden Baden.
Being curious about the ideas and implementation actions regarding all improvements on the sound quality I found some details:
This is the entrance hall, the former main train station – where tickets are sold.
The side walls are made and painted with an extra mixture of not reflecting too much waves.
Side corners are equipped with a special glass having some extra inlays on the backside.
The roof side is equipped with dampening buffers.