JIS Z 8739:2021 Acoustics -- Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
2021JIS Z 8739:2021 Acoustics -- Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
2001JIS Z 8739:2001 Acoustics -- Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels