What is the typical voltage range for mic level signals?

The typical voltage range for mic level signals is indeed around 0.001 to 0.0003 volts. Microphones, particularly dynamic and condenser types, output very low-level signals, which is why they are classified as mic level. This very low signal level is necessary for accurately capturing audio but must be amplified significantly by a preamplifier to bring them up to line level for processing and distribution in audio systems. Mic level signals are generally in the range of millivolts, making them susceptible to noise and interference, which is why it is crucial to handle them with care and to use appropriate shielding and polar patterns.

The other voltage ranges mentioned either exceed or fall short of the typical mic level signals, as they would be too high for an effective microphone output or not sufficiently represent the low energy of sound captured by a mic.