Hello Rob and the Group
Many thanks for your analyses. They have certainly got my grey matter
stirring.
The "typical frequency response curve" supplied on the 35-0192 data
sheet does, indeed, show a rise to +8db at 5k, followed by a rapid
fall to -3dB at about 12k. It seems my capsules are to spec and one
gets what one pays for (=A30.35p :-)
--- In Rob Danielson <> wrote:
> The additional gain of your TriCap rig would take some time getting
> used to, but I consider your field recording levels to be fine. In
> fact they could be a click or two higher without detriment. There
> seems to be an apparent loudness from the dominant mid range tones of
> the geese calls. Human ears are quite sensitive to and quickly
> fatigued by such content. Try attenuating just the two fundamental
> pitches with parametric EQ and I think you'll hear the phenomenon.
> Its counter intuitive, but this technique often makes ambient
> recordings (played loud) feel more life-like,tonally balanced. One
> question that rise is, does the TriCap rig have exaggerated upper-mid
> tones?
>
> In your simultaneous recording test between the NT-4 and your
> Tri-Capsule Parallel Boundary Rig;
> http://ad2004.hku.nl/naturesound/TomR/mp3compilation.mp3
> after boosting the volume of the NT-4 recording 19dB to match
> apparent playback volume (highly influenced by 300Hz and below on my
> full bandwidth headphones) one can see the considerable difference in
> the spectra:
> http://ad2004.hku.nl/naturesound/TomR/NT4+19dB-%3ETriCap.jpg
>
> The TriCap rig is much more responsive to the lowest octaves. The
> TriCap is smoother, less dynamic or "bumpy" in the lower mid-range.
> (The floating blue clouds half way up on the left side of the
> sonogram are ~250 Hz). The smoother response of the TriCap from
> 100-500Hz might account for some of its better spatial imaging. One
> can also note that the upper-mid and high-end response of the TriCap
> rig is quite a bit lower compared to the NT-4 (and the WM61-A
> capsules based on my experience with both capsules in the field).
> Here's the AIFF sound file I made the above sonogram from
> http://ad2004.hku.nl/naturesound/TomR/NT4+19dB-%3ETriCap.aif.
>
> Any inordinate loudness from the TriCap rig would probably originate
> from sounds lower than the geese in your recording (whose dominate
> frequencies are ~1150 Hz and ~750 Hz). This is pretty evident in a
> sonogram (from two locations) with the dominant pitches of the geese
> on the left side and minimal ambience recorded with the same rig on
> the right.
>
http://ad2004.hku.nl/naturesound/TomR/TriCapsGeese_TripCapsMinAmbience.jpg
> Rob D.
>
>
> --
> Rob Danielson
> Peck School of the Arts
> University of Wisconsin-Milwaukee
> http://www.uwm.edu/~type/audio-art-tech-gallery/
>
>
>
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