Auditory strength
Auditory strength is the level at which we experience sound. A reverberant room gives a higher sound level than a room with added sound absorption.
High level
Low level
The measurement Strength states the sound level in the real room in relation to the sound level in an anechoic room with the same sound source. The measurement demonstrates the room reflections’ effect on the sound level. 
Strength real room.
Real room 
Strength anechoic chamber
Anechoic chamber 
Perceived attribute
Objective descriptor
Measure of the room’s contribution to the sound or noise level from a sound source.