Sound system equipment: Headphones and earphones associated with portable audio equipment - Maximum sound pressure level measurement methodology and limit considerations -- Part 1: General method for "one package equipment".
音响系统设备:与便携式音频设备有关的耳机和入耳式耳机.最大声压级测量方法和极限注意事项.第1部分:“单包设备”的一般方法