Rob Danielson, you wrote,
>Professor Dugan, I signed up for the course in Audio Measurement
>Reference Levels, again. Charts 3 and 4 here
>http://www.rane.com/note148.html show mic sensitivity as -dBu and as
>mV/Pa.
One of the problems with mic specs is that people use different
scales and you have to convert to compare. The mV/Pa is typical. dBu
for sensitivity isn't; Shure and Sennheiser reference dB re 1V. Rane
is converting to dBu because they're trying to make it easier for us.
>Seems not to be a simple arithmetic relation/conversion. What
>is the "-32 dB" sensitivity measurement you are working with
>referenced to or need it be?
Any dB figure except gain is ambiguous unless the reference is noted.
dBu is shorthand for 0 =3D .775Vrms. dBV is re 1Vrms. dBm is re 1
milliwatt, a power level, not a voltage level, so it depends on the
impedance. It's gone out of style because we don't impedance-match
audio connections any more.
-Dan Dugan
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