This doesn't get talked about much but, the input impedance of your preamp should be 10 times the output impedance of your mic. So, a mic with an output impedance of 50 ohms would go well with an input impedance of 500. A good match usually means the best performance but, of course, your mileage may vary.
Higher end preamps often include switchable input impedance to the get the best out of a variety of mics.
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