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本文采用Ｍ×４１／ＡＲ型缓冲垫的ＴＤＨ３９型耳机，对噪声作业人员等，用自己配戴耳塞的方法，测定了美国Ｃａｂｏｔ公司的蘑菇状耳塞、松树状耳塞和柱状耳塞在０．１２５～８ｋＨｚ之间１０个音频上的声衰减值，结果如下：①三种耳塞的平均声衰减值在２５～２８ｄＢ之间，三者无差别。它们都是对中高频特别是对高频的衰减效果好，且三种耳塞在各频率上的平均声衰减值（ｄＢ）与其频率（ｋＨｚ）呈直线相关，其回归方程分别为：ｙ＝１８．５＋２．５ｘ，ｙ＝２１．０５＋２．５１ｘ，ｙ＝１５．１＋３．７ｘ。②由于测试的方法不同，本次的实测值较厂家的理论值平均低７～１７ｄＢ（相当于６０～８０％），尤其是柱状耳塞和磨菇状耳塞及其在１２５Ｈｚ～２ｋＨｚ的差别更大。③与国产护耳器中较好的ＸＸ型泡沫塑料耳塞的平均实际声衰减值比较高５～１０ｄＢ，④三种耳塞的ＮＲＲ值分别为１１ｄＢ、８ｄＢ和４ｄＢ，仅为厂家的１４～４４％。同时也说明，要想提高噪声的个人防护效果，不但要重视耳塞的选择，还要重视耳塞的佩戴方法。本次的测定结果仅供参考。
In this paper, M × 41 / AR-type cushion TDH39 headphones for noise operators, etc., with their own method of wearing ear plugs, the United States Cabot mushroom plugs, pine-like ear plugs and cylindrical ear plugs in 0.125 ~ 8kHz sound attenuation between the 10 audio values, the results are as follows: ① three kinds of earplugs average sound attenuation value between 25 ~ 28dB, the three no difference. They are good for high frequency, especially high frequency attenuation, and the three kinds of earplugs at each frequency average attenuation value (dB) and its frequency (kHz) was linearly related to the regression equation were: y = 18 .5 + 2.5x, y = 21.05 + 2.51x, y = 15.1 + 3.7x. ② Due to the different test methods, the measured value is 7 ~ 17dB lower than the theoretical value of the manufacturer (equivalent to 60 ~ 80%), especially the columnar earplugs and mushroom-shaped earplugs are more different from 125Hz ~ 2kHz . ③ Compared with the better type XX earplugs in domestic ear protectors, the average actual sound attenuation value is 5 ~ 10dB, ④ The NRR values of the three earplugs are 11dB, 8dB and 4dB respectively, only 14 ~ 44% of the manufacturers. At the same time also shows that in order to improve the personal protective effect of noise, not only should pay attention to the choice of earplugs, but also pay attention to the earplugs to wear. The results of this measurement are for reference only.