In order for you to hear noise through a wall or ceiling, airborne sound contacts a solid building material such as drywall and turns into vibration energy. This vibration energy easily passes through wall studs or ceiling joists and radiates out on the other side as bothersome airborne noise. Separating drywall from a stud or joist with a resilient element prevents structure borne vibration from traveling through a wall or ceiling (in this case the spring in the ICW ceiling hanger separates the direct attachment of the drywall from the joist). In general, the more resilient the isolator is, the more effective it is in reducing or eliminating this vibration transmission. Springs are the most resilient, therefore they offer the most mitigation across a wide range of frequencies produced in home theaters. This becomes very beneficial when it comes to reducing vibration caused by subwoofers.
In addition to controlling noise, these same elements reduce or eliminate the sound of people walking across the ceiling, maintaining your cinematic experience.