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  1. A scale of the percentage of the articulation loss of consonants. A formula derived by V.M.A. Peutz based on distance, RT60, Volume of air in the room, the N factor, and the Q of the source. A measure of how difficult it is to understand someone in a room. The lower the number, the better for speech intelligibility. Source: Church Audio & Acoustics Glossary
  2. The measured percentage of Articulation Loss of Consonants by a listener. % Alcons of 0 indicates perfect clarity and intelligibility with no loss of consonant understanding, while 10% and beyond is growing toward bad intelligibility, and 15% typically is the maximum loss acceptable. Source: