标题: 耳机测试 maximum decibel output testing [打印本页] 作者: BV211 时间: 2013-4-16 09:56 标题: 耳机测试 maximum decibel output testing maximum decibel output testing will performed with cutoff points at 3% THD or 120 dBSPL and with the audio reduction on and off, only off if user can turn off " B* H& h* K$ o' t! T. ]# G 6 u8 @' J; B* a( p+ t5 K% z这个是标准里面的声压测试吗? 要用到什么仪器? “with the audio reduction on and off, only off if user can turn off” 这个什么意思? ! C. ~3 h7 Z f; n0 h. M' G. k0 N% F& p0 f