A purpose-built sound transmission suite compliant with BS EN ISO 10140-5:2010
The suite consists of two reverberation rooms with a dividing partition wall containing the test specimen. In the source room, extremely loud pink noise is produced whilst rotating microphones measure frequency-dependent sound levels in both the source and receiving rooms.
In this way, the difference in sound levels between the rooms can be calculated.
With corrections for background noise and reverberation time the sound insulation performance of the test specimen can then be determined.
This performance is expressed in third-octave frequency bands and summarised by a single figure weighted sound reduction parameter Rw that may then be used in product literature. The sound transmission suite has been suppressed sufficiently to enable measurement of Rw = 65dB.