ASHRAE研究项目624-RP调查了将混响室声功率测试的频率范围扩展至63 Hz和31 Hz倍频程（用于宽带和离散频率声源）的测量程序。共有四个主要研究领域:（1）文献综述，（2）对模型混响室中的声场进行详细研究，（3）对不同尺寸和配置的混响室中三分之一倍频程和单频测量的替代方法的再现性进行研究，（4）用强度扫描法校准调查中使用的声源。工程结果表明，替代法是混响室低频声功率测量的最合适方法。 该方法的再现性和准确度虽然大于100 Hz及以上频率下的值，但似乎是可以接受的。关键词:实验室测试、测量、声音、强度、混响、房间、校准、精度、研究。引用:研讨会，ASHRAE Trans。，1993年，第99卷，第2部分，论文编号DE-93-1-1429-439，图7，表2，参考文献。

ASHRAE research project 624-RP investigated measurement procedures for extending the frequency range of sound power tests in reverberation rooms down to the 63-Hz and 31-Hz octave bands for broad-band and discrete frequency sound sources. There were four main areas of investigations - (1) a literature review, (2) a detailed study of the sound field in a model reverberation room, (3) a study of the reproducibility of the substitution method for both one-third-octave and single-frequency measurements in a number of reverberation rooms with different sizes and configurations, and (4) calibration of the sound sources used in the investigation by the intensity scan method. The project results suggest that the substitution method is the most suitable method for measuring sound power at low frequencies in reverberation rooms. The reproducibility and accuracy of the method, while larger than the values at frequencies of 100 Hz and above, appear to be acceptable.KEYWORDS: Laboratory testing, measuring, sound, intensity, reverberation, rooms, calibrating, accuracy, research.