Lucky for you that 13K stands out so audibly, Rich! It seems to be
an actual sound-- something I cannot find the source of, possibly
even a transmission. I had everything off, even downstairs, and
everything running on DC. Here's a spectrogram of the clock test
movie that Gianni sent back in November:
http://www.uwm.edu/~type/Mic%20Preamps/MicroTrack_NH900_722Compare2.jpg
Gianni recently asked about some High Hz banding he was seeing with
his NT1A's, so to get a sense of what's inherent my NT1A's, I made
some spectrograms of simultaneous recordings made in a mid-winter
very quiet, remote wood at about 2am. (Way up in the hollow Rich).
The Sennheiser mkh80 is included for comparison.
http://www.uwm.edu/~type/Mic%20Preamps/NT1A_MKH80_Remote2AMPresSpect.jpg
I could not find any significant banding at any frequency including
13K, so this seems to confirm the 13K sound was recorded, not
self-noise. The sample is 3 seconds long and the vertical scale is
0-24KHz. Rob D.
=3D =3D =3D
At 4:34 AM +0000 1/9/06, Rich Peet wrote:
>--- In Rob Danielson <> wrote:
> In this test,
>>
> > http://www.uwm.edu/~type/Mic%20Preamps/MicroTrack_NH900_722Compare2.mo=
v
>>
>....
>
>Did you add a high pitched whistle to go with your clocks in your
>recording area or are you now chasing whistles from your nt1-a's like
>I have had to do in the past with my old mics?
>
>Rich
>
--
Rob Danielson
Film Department
University of Wisconsin-Milwaukee
[Non-text portions of this message have been removed]
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