3. Re: Summary: [Nature Recordists] Re: EIN values and bits and peaks

["Dan Dugan" dandugan_1999]

> 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 n=
oise" of the preamp. Therefore it should not be used for the noise contribu=
ted by the microphone. I don't think there's a standard term for the output=
 level of the mic's self-noise, ordinarily quoted in terms of equivalent SP=
L. 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 impedance=
 of the preamp on the output impedance of the mic. Either or both may not b=
e flat in the frequency domain. Let's not go there for now!

-Dan