): The reduction in sound pressure level (dB) when the distance from a speaker is doubled. Speech Level at 4 Meters (
): 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 DIN EN ISO 3382 3 E 2021 02 pdf
): The average steady-state noise from HVAC or masking systems. Measurement Requirements INTERNATIONAL STANDARD ISO 3382-3 ): The reduction in sound pressure level (dB)
): 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 DIN EN ISO 3382 3 E 2021 02 pdf
): The distance from a speaker where the Speech Transmission Index (STI) falls below 0.50, the point at which concentration starts to improve. Background Noise Level ( Lp,A,Bcap L sub p comma cap A comma cap B end-sub