umashankar wrote:
> about the md 21. it is a dynamic microphone. many dynamic microphones are=
intrinsically lower noise than condensors, but they have also low output. =
most of the mic preamplifiers I see these days (the exception is the 722) d=
o not amplify these low output microphones well.
Right, the theoretic A-weighted EIN of a dynamic microphone with an impedan=
ce of 200 ohms is only -135 dBu (see http://www.rane.com/note148.html) and =
the sensitivity of the MD21 is only 1.8 mV/Pa.
This means that the resulting system noise is determined more or less exclu=
sively by the EIN of the preamp, which is completely different from the oth=
er condenser or electret microphones that we commonly use.
In a common condenser microphone with its much higher output level (let's s=
ay 25 mV/Pa), the EIN of the preamp has usually only a comparatively small =
or sometimes even no influence at all.
Regards,
Raimund
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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