Hello!
After my last posting, see below, I have got questions about the new
SoundScapeMic and Zoom / Sony Plug in power.
Here are my results from measuring and listening:
The driving voltage was taken from a variable power supply, filtered
by 150 Ohms and 470 mfd to ground, then 2,2 kOhms to the drains of
two EM172. The output was connected to the recorder input via a 1 mfd
tantalum condenser. The recorders PIP voltage was "off".
The mics were placed in front of loudspeaker giving 100db SPL at 440
Hz. sine wave.
For reference: 100 db SPL and 1v driving voltage =3D 0db output.
I could not measure distortion, but the sine wave at the oscilloscope
looked fine.
Measurements were made at 0,5v / 0,7v / 1v /2v and 3volts.
The output from the mics were less than 5 db more at 3v than at 0,5v
and the mic self noise followed.
Conclusion: Two EM172 give a higher output at a higher driving
voltage, but the noise follows the output.
So two em172 / channel will work fine on PIP with all modern
recorders and there seems is be no need to build extra boxes with 9v batter=
ies.
Klas
As I have posted on the Naturerecordist list a number of times, I
have been intensely busy designing a new mic system especially
calibrated for SoundScapes. This odyssey began
at the 2009 Murie Center Workshop that Bernie, Martyn, and Kevin put
together in Wyoming.
While the early designs had some spatial and imaging issues, this new
system is spot on!
Please visit http://klas.telinga.com/demo
(All recordings done with Olympus LS-11 on High sens, 8 to 10 on the
wheel and 24bit.)
Frankly, I love this mic! Main features: It is light-weight, easy to
use, small to pack down in a suitcase, not sensitive to wind and
handling noise and runs very low noise on PlugInPower.
The sound character is big and transparent. Listening to the sound, I
lean back and relax, undisturbed by too much of side, harsh or
metallic coloring.
Sitting in the bush, monitoring with my Beyer headphones, taking the
Beyer's on and off, comparing the sound I get from the mics with what
I hear with my ears only, - it's the
only stereo rig so far that gives me a realistic sound image of wind.
I especially love the ambient sounds of the forest. The forest is big
and the acoustic imaging is as real as it gets.
Hope you enjoy!
Klas
Telinga Microphones, Botarbo,
S-748 96 Tobo, Sweden.
Phone & fax int + 295 310 01
email:
website: www.telinga.com
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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