Research Report RR:E33-1011
An interlaboratory study for test method C423 was conducted by ten laboratories to determine whether uncertainty in measuring decay rate contributed significantly to the uncertainity seen in interlaboratory comparison of sound absorption measurements, E33-1010.
C423-09a Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
Committee E33 on Building and Environmental Acoustics
Subcommittee E33.01 on Sound Absorption