  The design of a 9-channel microphone system for location recording of mainly
atmospheres will be described. The key concept is matching the recording and
reproduction angles of the individual sectors. The rig is designed for the
AURO-3D 9-channel playback system (4 height speakers). An analysis of the
reproduction layout will be included, as well as recording concepts like the
Stereo Recording Angle (SRA), Williams curves, Scale Factors for different
reproduction angles than 60 degrees and diffuse field decorrelation. Finally,
practical aspects like microphone mounts and windshields for such a system will
be presented.
