A spherical microphone array that includes a sound-diffracting structure having a closed three-dimensional shape of at least one non-regular, regular or semi-regular convex polyhedron with congruent faces of regular or non-regular polygons and at least two omnidirectional microphones disposed in or on the sound-diffracting structure on an oval line whose center is disposed on a center line that subtends the center of one of the faces of the regular polygons.