Neumann AK active capsules are part of the variable miniature microphone system. Together with the KM 100 output stage AK active capsules form a complete microphone. AK 30 and KM 100, for example, make up the KM 130.
The AK 43 is a pressure gradient transducer with wide-angle cardioid characteristic. Attenuation: 4 dB at 90°, 8 dB at 135°, and 11 dB at 180°. The frequency response for sound sources within an angle of ± 90° (off axis) is parallel up to 12 kHz.