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ANSI/ASA S12.5-2016 (R2020)/ISO 6926-2016 (R2020)
Acoustics - Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels (a nationally adopted international standard)
This American National Standard specifies the acoustical performance requirements for reference sound sources: temporal steadiness (stability) of the sound power output; spectral characteristics; directivity.
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Acoustical Society of America [asa]