Rob, it seems as we are now doing exactly the kind of tests that I have
looked for under the last 20 years, after the HQ electrets came.
I think ME66 is around the 16 db(A) self-noise level and with an output of=
50 mV/Pa. According to Raimund's tests, it's internal self noise drowns the=
input noise of all three recorders!
I know of people who have bought really expensive recorders like the 722
ONLY to get rid of this noise.... And it would be SO great if we finally
could kill all this massive talk about the need for a mic.pre for
naturesound recordists.
What about 50mV/Pa and 10 dB(A) - as you suggest?? Would we hear a
difference? Possible. Or must we go down to 5 dB(A)?? At which output level=
??
And how the f... can one calculate the same, using those "sensitivity"
data which are used both for mic's and recorders?? It must be possible, but=
I haven't seen it yet.
(For the music and on-location people it's another story. They also need
headroom and good distortion figures, which changes everything.)
Klas.
At 18:00 2005-11-25, you wrote:
>Hi Raimund--
>Great to get a chance to consider the 671 too.
>There doesn't seem to be as much urban "rumble"
>where you are.
>
>Any thoughts about the consistency in the higher
>register hiss? Looking at a sonogram, there's a
>band-shelf across all three segments, dropping
>off at ~5.2KHz.
>http://www.uwm.edu/~type/Mic%20Preamps/Raimund_MT2496_M671_SD722.pdf
>
>I'm not familiar with the ME66. It seems a mic
>with a self noise of 10 dB(A) would be low enough
>to reveal important differences. There is more
>lower-register "room tone" evident in the 722
>segment, but to my ears, most of the differences
>are effectively masked by the consistent hiss.
>Could it possibly be the ME66's self noise, as
>illogical as it seems? Rob D.
>
> =3D =3D =3D =3D =3D
>
>
>
>At 10:16 AM +0100 11/25/05, wrote:
> >Here is a another noise comparison between the M-Audio MT2496,
> >Marantz PMD671 and SoundDevices 722 in conjunction with a sensitive
> >microphone. I placed a Sennheiser K6/ME66 (sensitivity: 50mV/Pa,
> >self-noise: 10dB(A)) in front of a small ticking clock (distance: 0.5m =
=3D
> >20")in a quiet room and connected it to all three recorders one after
> >another. All recorders were set to their maximum gain settings and the
> >phantom power supplies were activated (I switched off the K6 internal
> >battery supply). The original .wav files were normlizied to approximatel=
y
> >the same level and were pasted into a single file (separated by short si=
lent
> >breaks). The first section is the MT2496, then the PMD671 and finally th=
e
> >SD722:
> >
> >http://www.avisoft.com/scratch/MT_671_722.wav (1.5 MB download)
> >http://www.avisoft.com/scratch/MT_671_722.mp3 (285 kB downlaod)
> >
> >Regards,
> >Raimund
> >
> >--
> >Lust, ein paar Euro nebenbei zu verdienen? Ohne Kosten, ohne Risiko!
> >Satte Provisionen f=FCr GMX Partner: http://www.gmx.net/de/go/partner
> >
> >
> >
> >"Microphones are not ears,
> >Loudspeakers are not birds,
> >A listening room is not nature."
> >Klas Strandberg
> >Yahoo! Groups Links
> >
> >
> >
> >
>
>
>--
>Rob Danielson
>Film Department
>University of Wisconsin-Milwaukee
>
>[Non-text portions of this message have been removed]
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
[Non-text portions of this message have been removed]
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