Thank you for that clarification. I have wondered whether that was correct =
usage. The Rane sheet uses the term "Output Noise."
But it is convenient (for me at least) to use one term so as not to have ye=
t another one rattling around in my poor, often befuddled, brain, and as a =
reminder of which numbers to compare. I think that is the origin of my misu=
se of the term.
John
--- In Dan Dugan <> wrote:
>
> > In an attempt to make my calculations a little clearer and more useful,=
I made some changes to the spreadsheet.
>
> This is very useful, John, thank you.
>
> I quibble with the use of one term. "EIN" refers to the "equivalent input=
noise" of the preamp. Therefore it should not be used for the noise contri=
buted by the microphone. I don't think there's a standard term for the outp=
ut level of the mic's self-noise, ordinarily quoted in terms of equivalent =
SPL. It's a useful figure, though, and perhaps we should invent a term for =
it. Self-noise output?
>
> Missing from your calculations is the loading effect of the input impedan=
ce of the preamp on the output impedance of the mic. Either or both may not=
be flat in the frequency domain. Let's not go there for now!
>
> -Dan
>
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