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Impedance

Impedance represents the electrical resistance of the microphone to the alternating current, which is essentially the audio signal. It is given in units called ohms, denoted by the symbol Ω. There are mainly two categories of microphones: low-impedance and high-impedance. Most modern studio and stage microphones are low-impedance, with values typically below 600 ohms. The importance of this parameter lies in the relationship between the output impedance of the microphone and the input impedance of the equipment into which the microphone is plugged, such as a mixing console or sound card. As a general rule, the input impedance of the preamplifier should be at least ten times higher than the output impedance of the microphone for proper signal transmission. If the impedance of the input device is too low and close to the microphone impedance value, the microphone is loaded incorrectly. This results in a noticeable loss of signal and especially a loss of low frequencies, making the sound sound sound "thin" and weak. Proper impedance matching thus ensures that the audio signal from the microphone is transmitted to the next device in full quality and without degradation.

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