这是ANSI/ASA S3的一部分。55/IEC 60318描述了一种用于加载耳机或耳机的声学耦合器 在确定其物理性能时具有特定声阻抗的助听器 特性，频率范围为125 Hz至8 kHz。适用于空气传导助听器 以及通过耳模或类似设备等耳嵌件连接到耳朵的耳机。耳机产生的声压在耦合器中通常与耳机中的声压不同 人的耳朵。然而，它可以作为交换规范的简单而现成的手段 以及有关助听器的物理数据，以及用于校准在听力测试中使用的指定插入式耳机的物理数据 听力测试。

This part of ANSI/ASA S3.55 / IEC 60318 describes an acoustic coupler for loading an earphone or hearing aid with a specified acoustic impedance when determining its physical performance characteristics, in the frequency range 125 Hz to 8 kHz. It is suitable for air conduction hearing aids and earphones, coupled to the ear by means of ear inserts e.g. ear molds or similar devices.The sound pressure developed by an earphone is not, in general, the same in the coupler as in a person's ear. However, it can be used as a simple and ready means for the exchange of specifications and of physical data on hearing aids and for the calibration of specified insert earphones used in audiometry.