本标准规定了电影配音影院（混音室）、放映室和房间容积超过125米（4414英尺）的室内影院B链的测量方法和特征电声频率响应。其目的是帮助在此类房间中监控和再现电影声音的标准化。目标是在不同装置之间，以及装置内不同位置之间，具有恒定的感知响度和频率响应。本标准不包括从换能器延伸至输入源音频选择器的电影声音系统部分。

This standard specifies the measurement methods and characteristic electroacoustic frequency response of the B-chain of motion-picture dubbing theaters (mixing rooms), screening rooms, and indoor theaters whose room volume exceeds 125 m (4414 ft). It is intended to assist in standardization of monitoring and reproduction of motion-picture sound in such rooms. The goal is to have constant perceived loudness and frequency response from installation to installation, and from position-to-position within an installation. This standard does not cover that part of the motion-picture sound system extending from the transducer to the input source audio selector.