本规范涵盖用于85-105 dBA SPL（声压级）中等环境噪声级环境的耳机和耳机麦克风组件。这些耳机-麦克风组件使用动圈式动态耳机，将电能转换为声能。完整的组件包括头带、安装在刚性耳罩中的耳机，以及满足各种军事服务活动要求的绳索组件。根据需要，这些组件包括一个降噪麦克风和吊杆。

This specification covers headsets and headset-microphone assemblies intended for use in medium ambient noise level environments of 85-105 dBA SPL (Sound Pressure Level). These headset-microphone assemblies use dynamic earphones of the moving coil type that transform electrical energy into acoustical energy. A complete assembly includes headband, earphone(s) mounted in rigid earcups, with cord assemblies to meet requirements of various military service activities. The assemblies include, as required, a noise canceling microphone and boom.