Rob Danielson, you wrote,
> >>Some numbers that have proven to be very useful estimates for us are:
>>>
> >>Consumer MD mic pres with the gain set at maximum have an equivalent
>>>self noise of 20-25dB(A).The Walkman DAT's are in the same
>>>neighborhood.
> ><snip>
And I asked,
> >Can you explain how this specification is derived?
My problem is that it seems impossible to me to specify "equivalent
self noise" for a mic preamp in the way you do above. If your dBA
figure refers to SPL, then it's wrong because different mics have
different sensitivities and deliver different levels to the preamp
for the same SPL.
dB means a ratio. It has to be related to some reference level. What
does your self noise figure refer to?
-Dan Dugan
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