There is a misconception that acoustic ceiling panels are as effective as walls at blocking sound and that where sound blocking is required, sound absorption is less important. This is not true. Sound absorption is a critical component of every room that will be occupied by people and, while modular acoustic ceilings are not effective at blocking sound—they are, in fact, very good at absorbing it. Ceilings are for absorbing noise. Walls are for blocking noise.
Truth: Good acoustic design begins with the optimal sound absorption rating for the ceiling. This should never be compromised in hopes of also blocking noise with the ceiling.