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Old November 6th 19, 02:33 PM posted to
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Default Comparing two audio interace mice pre's for self noise.

Preamps often have 1/F noise not white noise so the majority of the noise power you will read on a flat meter will be low freq, which will not always be audible.

A better measure of how noisy it _sounds_ would be to use A or some other weighting to make the measurement.

But it is also true, most eletret mics effectively have a built in preamp so I would also do a test with the actual mic you want to use as well as with the terminator.