When walls don't extend to the structural deck, acoustical ceiling tile (ACT) systems don’t do enough to control the transmission of sound from one room to another. Kinetics noise-control ceiling tiles provide the highest CAC* ratings in the industry and are available with almost any desired finish.
“Speech Privacy” is a concern when confidential conversations and other noises in one room are heard next door.
CAC (Ceiling Attenuation Class) is the measure for rating the performance of a ceiling system as a barrier to airborne sound transmission through a common plenum between adjacent closed spaces. (<25 = poor performance, >35 = high performance).
(source: Architectionary.com)