Generally, it is difficult to calibrate microphonesensitivity without special calibration instruments, which makes the maintenance ofmicrophone can't be done frequently.
没有专门的校准设备通常难以进行测试传声器灵敏度校准，这个因素限制了传声器的日常校准。
2
Selectable microphonesensitivity allows optimal recording of personal dictation, small conferences or lecture halls.