): The A-weighted sound pressure level of speech at a 4-meter distance, indicating how much nearby surfaces reflect sound. Comfort Distance ( rCr sub cap C
The standard defines several single-number quantities to evaluate acoustic performance: Spatial Decay Rate of Speech ( D2,Scap D sub 2 comma cap S end-sub DIN EN ISO 3382 3 E 2021 02 pdf
): A newer metric that has largely replaced "privacy distance" in recent revisions, indicating the distance at which speech becomes comfortable for others. Distraction Distance ( rDr sub cap D ): The A-weighted sound pressure level of speech
): The reduction in sound pressure level (dB) when the distance from a speaker is doubled. Speech Level at 4 Meters ( DIN EN ISO 3382 3 E 2021 02 pdf