Is this a good way to test pre-amp hiss of a digital recorder?



This is what I was thinking.
Set the recorder for mic-in, but don't actually plug
a mic in. Then get the recording started and run the
recorder through the various levels of gain, from low
to high. Take the resultant recording and load it into
your audio editing program and check the dB
levels at the different gain settings that were used.

Any reason why this wouldn't work and be accurate?

.



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