What's the function of the shock absorber?

Sound is produced by vibrations, and the function of a shock absorber is to reduce the vibrations that cause noise, thereby achieving the purpose of reducing noise. Generally speaking, there are two types of shock absorbers: ceiling shock absorbers and wall shock absorbers. 

Ceiling shock absorbers

Ceiling shock absorbers are installed inside the ceiling. Noises from upstairs, such as dragging stools, playing basketball, and running, will be absorbed by the shock absorbers, thereby reducing the noise. However, this type of shock absorber is relatively long and requires more floor height. If the floor height of the house is insufficient, installing a ceiling shock absorber will make the room feel relatively short. 

Wall shock absorbers

Wall shock absorbers are installed on the wall. If your room is adjacent to someone else's room or an elevator room, it is recommended to install wall shock absorbers. Wall shock absorbers are relatively short; installing keels + shock absorbers + filled soundproof cotton + gypsum boards is approximately 9cm thick, which does not take up much space.