NF C97-357-1*NF EN 50332-1:2014 音响系统设备: 便携式音频播放设备用头戴式受话器和耳机. 最大声压级测量方法. 第1部分: 一揽子包装设备的通用方法
Sound system equipment : headphones and earphones associated with personal music players - Maximum sound pressure level measurement methodology - Part 1 : general method for "one package equipment"