When we speak about microphone level, it refers to the output level of the microphone without preamplification. Microphone level is significantly lower than line level, from a few micro volts up to several volts (depending on the sound pressure with which is excited).
– It can be up to -60 dBu (0.0007 VRMS).
A mic signal must be preamplified before it can be used at line level.
