About the only advantage of high impedance microphones is lower cost.
High impedance microphone cable.
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This can become a problem as the length of the cable increases.
Different manufacturers use slightly different guidelines but the classifications are roughly.
However there are many disadvantages.
You will often find that mics with a hard wired cable and 1 4 plug are high impedance and mics with separate balanced audio cable and xlr connector are low impedance.
A high impedance microphone has an impedance from 10 000 to 100 000 ohms.
High impedance mics range from 10 000 to 100 000 ohms with low impedance mics ranging from 50 to 600 ohms.
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There are three general classifications for microphone impedance.
The cable length is critical.
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Similarly if you connect a high impedance microphone you will have a higher impedance line all the way from the microphone to the mixer.
While higher mic impedances theoretically equate to stronger audio signals due to increased voltage this is not always desirable due to the risk of noise as impedance rises.
A low impedance microphone will lower the impedance of the entire line connected to it.