Klas and others:
I am preparing to test the dual-mike, reversed polarity technique using my
Telinga parabola and two MKH 20 mikes. I've mounted a second MKH twenty on
the edge of the parabola, aiming upward. This should receive most all
background sound. I'm in the process of soldering a special short cable with
two female XLR plugs, to reverse the polarity coming from the edge
microphone. I'll then connect both mikes with using a "Y" connector and
route the mixed signal to my recorder.
This should be very interesting. I hadn't thought of using this technique,
but it should drastically reduce background rumble and it possibly could
have minimal effect on the song of a bird, as long as the bird is
well-focused using the parabola. Basically, the only attenuation of a
"focused" bird song should be whatever the level would be at the mike
without using the parabola.
Klas, have you actually tried using this technique in the field? If you
have, then what were your results?
Lang
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