"Dave Plowman (News)" wrote:

Eeyore wrote:

Someone else (edited out) wrote.

Yup. Anything that starts off life at a microphone is unlikely to do
very much better. And most recordings use several microphones...

Really good microphones have equivalent acoustic noise levels of well
below 20 dB.

There's rather more to the average chain than just the microphone.

Please elaborate with especial regard to where you think my figures are
wrong.

Graham