DS DSEN SO 140-1A1 2005-FEB-07 Acoustcs - Measurement of sound nsulaton n buldngs and of buldng elements - Part 1 Requrements for laboratory test facltes wth suppressed flankng transmsson - Amendment 1 Specfc requrements on the frame of the test openng for lghtweght twn leaf parttons Replaced by DS DSEN SO 10140-3 DS DSEN SO 10140-4 DS DSEN SO 10140-5