DS DS/EN 20140-9
DS DSEN 20140-9 1993-NOV-10 Acoustcs - Measurements of sound nsulaton n buldngs and of buldng elements - Part 9 Laboratory measurement of room-to-room arborne sound nsulaton of a suspended celng wth a plenum above t Superseded by DS DSEN SO 10848-2AC Replaced by DS DSEN SO 10848-2AC