Providing sensitive users with optimal acoustics at two levels :
- Being heard
- Reducing sounds
This first level consists of seeking to achieve good intelligibility of spoken words in the room being studied.
A speaker who talks normally must be fully understood by his listener, regardless of his location. The room must have reverberation that is neither too high (when syllables are superimposed, this leads to a loss of intelligibility), nor too low (an absence of reflection of the signal leads to the feeling that you are in a dead room).
This second level consists of reducing and limiting ambient sound levels prevalent in the room. The reverberation periods must be short there in order to limit the propagation of sound within the space to the maximum extent.
So what you are seeking to achieve then is a sound decay close to a free field (like outdoors).