Re: 3032vs4022 self-noise, HDP2vsDR680 input noise

["Paul Jacobson" thebrunswicktwitcher]

On 01/06/2010, at 5:19 AM, Dan Dugan wrote:

> Seems unlikely to me--I can't imagine a mechanism in a mic that would 
> generate such an artifact, except perhaps a DC-DC converter, which I doubt 
> would be in a 3032 because it's an electret and low-voltage. Is that visible 
> in any of the available data plots?
> 
> -Dan


Hi Dan,

Spectrum analysis of one of the quiet sections of the predawn recording doesn't 
show any obvious peaking in this area.

http://demo.mactrix.com.au/at3032/3032_predawn.png

This is the selection used for analysis:

http://demo.mactrix.com.au/at3032/Predawn_setup_selection.wav  [1.6MB 24/88.2]

it's not particularly interesting listening but is about as close to silence as 
I can find in the recording.

A shallow cut (-3db) around 4khz with apQualizr's peaking filter does remove a 
little bit of sizzle from the noise floor.

cheers
Paul