| Abstrakt: |
The room-to-room test method designated AMA-1-II was designed to measure sound transmission through suspended acoustical ceilings by way of a common plenum, but has also been used to measure the transmission loss of the partition dividing the two rooms with the plenum path closed off. Tests have been conducted on a single partition under varying conditions of absorption and diffusion in the rooms on both sides. The results show that the value of transmission loss determined from the standard formula TL=L1-L2+10 log (S/a) is independent of receiving room absorption a over a wide range, including complete ceiling coverage with a material having an absorption coefficient greater than 0.80, provided a is measured by a steady-state method. [ABSTRACT FROM AUTHOR] |
