The microphone/preamp interface is very important but not as well understood as its importance would suggest. The signal level between the microphone and the preamp is at the lowest level it will ever be. Furthermore, any degradation or loss of quality can’t be restored by later processing. The microphone, microphone cable, and preamplifier are made by different companies. The power for the microphone comes from the preamplifier. To optimally design the preamplifier it would be desirable to know the signal levels and the output impedance of the microphone. Also, the output impedance of the microphone affects the intrusion of external electrical noise into the system. A survey and study of the interface yields new insights into system performance.
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