The side walls of the control room are made with earth, the side treatment was made without attaching a nail or screw to the wall, creating sound-absorbing and diffusing cylinders fixed to the floor and to the upper curb (which is fixed to the ceiling). The control room has a non-environment design, with a reflecting and very solid front, and a lot of absorption on the ceiling, on the back wall and on the sides. Another problem of the room was the ceiling, not particularly high and above all concave, which tended to focus the sound towards the center of the room. The lateral tube traps were tuned to the resonant frequencies of the environment, while the panels were hung with panels filled with a large layer of polyester fiber. The ceiling diffuser is a binary amplitude diffuser, designed ad hoc for the studio and replicated also in the recording rooms. This device has a dual role: absorb and spread with a rather wide band in frequency.