Compared with the sound-absorbing materials on the indoor surface, the Ridges® 600 sound-absorbing body has a higher sound absorption efficiency under the same projected area.This is because the Ridges® 600 sound-absorbing body has a larger effective sound absorption area (including the upper top surface, lower bottom surface and side surfaces of the Ridges® sound-absorbing body); in addition, since the sound waves are reflected multiple times between the upper top surface of the sound absorber and the top surface of the building, they are absorbed multiple times, which increases the sound absorption and improves the sound absorption efficiency. Usually, the improvement in sound absorption efficiency in the mid- and high-frequency bands is the most significant. After installing the Ridges® 600 sound absorber, the noise reduction effect is usually 5-8 decibels, and can reach 10-12 decibels at the highest.