Re: Mics now? Re: preamps

[Dan Dugan <>]

Clarifying what Rob wrote:

>As I understand it, signal to noise is based on -94 dB, 1 kHz at 1 Pa
>so a mics self noise is the difference between this and the rating
>for the 853: -67 dB, 1 kHz at 1 Pa or 27dBA.

1 Pa is 94 dB SPL, not -94 dB. Positive-dB sound pressure levels 
produce negative-dB voltage levels on the mics (because the mic 
outputs are very small unless it's REALLY LOUD).

This is because the dB scale for sound pressure levels is based on 
zero at the threshold of human hearing, and mic voltage levels are 
based on zero at 775 millivolts, that's line level.

-Dan Dugan


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