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Test with a song of Blackcap, for a new stereo microphone system called “TETA”, that allows reception of the stereophonic image to cover fully 360-degree soundscape, a degree that can be varied by rotating the microphone heads to obtain a classic ORTF front stereo image. The capsules are spaced 17 cm from each other.

Looking at the waveform, the difference between the two halves of the file appears clear, with the subject at first positioned decidedly to the left with respect to the microphonic apparatus, then at 3’40” moved a little further to the right than the center.

Here a tested AOM 5024L microphone capsule. This capsule is comparable in size and sound performance to the most known and widespread Primo EM 172 (now EM 272). 
The AOL is more sensitive than the Primo capsule, however, in some uses, the lower sensitivity and the higher overload limit of the Primo, 119 dBspl vs 110 dB, allows a larger headroom, e.g. when used in a parabola.

See also: http://www.naturesound.it/2019/08/02/serata-estiva-con-ortotteri/

and: http://www.naturesound.it/2019/08/03/nightingales-duet-song-in-a-marshy-environment/

EVA light version of the TETA microphone

For more comfortable portability and use on-the-go, I also built a lightweight version, using an EVA block for Yoga. The half sphere shape was obtained by means of a wood lathe and are rotatable to obtain a degree of angolation that can be varied.