ALcons, like the Speech Transmission Index (STI), is an evaluation method for speech intelligibility
in rooms and halls with sound. As can be seen from the name Alcons, it is the loss of articulation for consonants. Consonants play
a decisive role in speech intelligibility.Therefore, the Alcons rating is based on the percentage of consonants that are not acoustically correctly understood.
TheALcons value is given in percent and depends on the factors mentioned as well as on
thedirectional characteristics of
, thebeam focusing, the distance of the listeners, the structure of the sound reinforcement room, its wall and floor conditions, the reflection and much more.