Stereo microphones such as the KFM 6 are distinguished by the simplicity of the recording technique and of the setup.
Stereo microphones such as the KFM 6 are distinguished by the simplicity of the recording technique and of the setup. Only two microphones and recording tracks are required, and with the KFM 6 only one microphone cable is needed.
The KFM 6 sphere microphone is the embodiment of a stereo microphone design using an acoustic baffle. It bears some resemblance to a "dummy head" and follows some of the same principles - but while dummy head recordings can provide excellent results, they are suitable only for headphone listening. The "Sphere" microphone was developed so that similarly convincing results could be achieved for loudspeaker playback. To fulfill this objective the microphone must provide not only interaural arrival-time cues, but also spectral-vs-angular incidence information. A further requirement was that the frequency response on the main axis of the microphone in the free sound field and also the frequency response in the diffuse sound field remain flat. (See G. Theile: "On the naturalness of two-channel stereo sound," AES/SMPTE Joint Television Conference, Jan. 1991, Detroit)