3. Install the U-shape lightweight wall frame parallel to the ceiling and floor, and install the C-frame perpendicular to U-shape with a distance of 60 cm.

4. Use screws to fix the sound-absorbing insulation both in width and length.

5. To increase the efficiency of sound reduction, place sound- absorbing insulation sheets above the ceiling frame along the upper frame.

6. Install sound-absorbing insulation panels to cover the entire area.