Audio Signal Levels: General Guidelines

Date Updated: August 31, 2017
I have heard the terms: mic level; line level; aux level. Please provide details.

Here are general guidelines to the typical ranges of audio signal levels.  Note the difference between each defined signal level range is 20 dB.
Mic level signal (low) = 0.0001 V = 0.1 mV = -80dBV
Shure SM11 output is an example.
Mic level signal (average or typical) = 0.001 V = 1 mV = -60 dBV
Shure SM58 output is an example.
Mic level signal (high or "hot") = 0.01 V = 10 mV = -40 dBV
Shure MX418 output is an example.  Also the Shure 588SDX output, set to high impedance, is an example.
Auxiliary level signal (AUX) = 0.1 V = 100 mV = -20 dBV
Shure SCM268 output, RCA jack, is an example.
Line level signal = 1.0V = 1,000 mV = 0 dBV
Shure SCM810 main output is an example.
Power amplifier signal (loudspeaker level) = 10V = +20dBV
QSC GX3 amplifier output is an example.