In this article we example the space characteristics of directed single gradient microphones with two acoustical entrances. A formula is defined that describes the shape of the space characteristics for any microphone regardless of its technical implementation, provided that the microphone has two acoustical entrances. The conclusions are valid for all cases when there is no diffraction. The basic formula that describes the space characteristics is valid for a sphere and plane sound wave and for the whole frequency response of the microphone.
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