Get the concept right
Sound Absorption ≠ Soundproof
A combination of 2 different concepts. Let’s suppose water represents the sound in a room. A sponge can only absorb a specific amount of the water; the water will still go through the sponge once it’s saturated i.e. once it has absorbed its maximum capacity. Soundproofing is more like a metal sheet, it basically stops ‘water’ from going through.
So, When Do You Need Sound Absorption Panels?
You can hear a significant echo in your room
Noise is driving you crazy, and you want to reduce it
You want to turn a communal spasoce into a multi-purpose space