GREAT!
both EM172 and NT1A are my preferred mics in the "acceptable cost" range. I
also like and use the AT4022.
Gianni
2013/8/9 Mike Rooke <>
> **
>
>
> Fuzzmeasure / OS X is good for producing graphs, sweep measurements and it
> also
> has a differential mode to e.g show "before" and "after" material testing.
>
> Natural pink noise and low frequencies are handy when testing mics but
> unfortunately that cannot be turned on and off on demand :)
>
> - Also placement of the mic will cause its own coloration, the back wall
> of the house and
> overhanging porch in this example:
>
> http://soundcloud.com/urlme/pmhc2p-rolling-thunder
>
> Gianni, Ill visit the anechoic chamber when the traffic dies down (for <
> 100hz) and make some 94 dB + silence tests for the MR2 + Sony D50. Mics:
> EM172 & NT1A via Rolls P48
>
> BR
> Mike.
>
>
> --- In Gianni Pavan <>
> wrote:
> >
> > Dear Dan, I agree with the method you suggest, however my willing is to
> > have a smooth noise to easily see in real-time the coloration of mics and
> > variable mounting options.
> > I'll do some tests with different sources? ¢Ã¢â?¢¬Â¦. including waterfalls
> > and
> > showers.
> >
> > Gianni
> >
> >
> > 2013/8/9 Dan Dugan <>
> >
> > > **
>
> > >
> > >
> > > > I'm willing to evaluate the "color" given to recorded sound by
> > > > different microphones and by the various types of baffles,
> windscreens,
> > > and
> > > > mounting options? ¢Ã¢Ë?¦`
>
> > >
> > > An excellent and very useful project.
> > >
> > >
> > > > I suppose the best way is to record a white noise,
> > > > however I would have something really "white", not colored by a
> speaker.
> > > Or
> > > > at least something with very wide and smooth spectrum, even falling
> like
> > > > pink noise? ¢Ã¢Ë?¦`.
>
> > > >
> > > > I'm curious to know if you have something to suggest for generating
> such
> > > > kind of wideband noise without a speaker? ¢Ã¢Ë?¦`.
>
> > >
> > > I did a test of a home-made windscreen at a waterfall. Recordings with
> > > windscreen on and off, then compared the spectra. It's the difference
> you
> > > care about, not the flatness of the stimulus.
> > >
> > > Proceeding from that, one can put pink (not white) noise on a speaker,
> and
> > > record with and without the windscreen or baffle. Then make analyses of
> > > each recording and subtract one curve (naked is the reference) from the
> > > other. It doesn't really matter that the speaker's output looks awful
> on
> > > the analyzer (they all do).
> > >
> > > Now that test will give you the windscreen attenuation or baffle
> > > coloration for one angle of incidence only. I think it's really in the
> > > diffuse environmental noise that one hears the coloration of a mic rig.
> > >
> > > In my lab I have a set of surround near monitors, and a set of distant
> > > "theater" monitors. I have a Pro Tools session that I call up for mic
> > > calibration tests that puts uncorrelated* pink noise into all ten
> speakers
> > > at calibrated levels so that each speaker contributes equal SPL at the
> > > measuring location.
> > >
> > > In the field I hear a definite wide-band boost of around 3 dB around
> 250
> > > Hz with my Jecklin disk. This reminds me I should measure that.
> > >
> > > -Dan
> > >
> > > * Made by recording a pink noise generator for ten minutes, then
> slicing
> > > it up into a one-minute segment for each track. I loop the 10-track
> > > one-minute playback.
> > >
> > >
> > >
> >
> >
> >
> > --
> > Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
> > Universit? ¢Ã?£ degli Studi di Pavia
>
> > Via Taramelli 24, 27100 Pavia
> > http://www.unipv.it/cibra
> > http://mammiferimarini.unipv.it
> >
> >
> >
>
>
>
--
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universit? ¢Ã degli Studi di Pavia
Via Taramelli 24, 27100 Pavia
http://www.unipv.it/cibra
http://mammiferimarini.unipv.it
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