 
                         
                        Spherical-Surface Stereo Microphone
KFM 100
The spherical surface microphone KFM 100 had two omni capsules flush mounted in a sphere. It worked similar to a dummy head stereo microphone, but was optimized for loudspeaker playback. Although technically excellent, it never caught on.
 
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                             
                            