It takes a lot of carpentry, but to get the best studio acoustics, some stations actually build non-parallel walls that are not physically connected to the walls of adjacent rooms. The studio then becomes a room inside a room, isolated from sound transmitted by contact with the rest of the station. Floors should also be carpeted. However, stations planning to conduct interviews and discussions in the studio cannot ignore room acoustics. Noise entering the studio through a ventilator can be suppressed by lining the duct with soft material, or by building baffles in front of and inside the duct.
Ventilation duct with baffles and soft lining.
Using two panes of glass improves the sound insulation. The glass on t-he studio side is often tilted so it is not parallel to the facing wall. This reduces sound reflection and conductance.