The AK SU/2U Adapter Cable from Schoeps is for use with stereo microphones MSTC 64 Ug (ORTF), KFM 6 and KFM 360 (sphere microphones) as well as the CMXY 4V Ug (X/Y microphone). The cable is used to adapt a stereo XLR-5F jack to two XLR-3M plugs.
The combination of this adapter cable with its inverse counterpart (AK 2U/SU: 2 x XLR-3F to XLR-5M) and an XLR-5 extension cable makes it possible to use just one cable for a stereo setup.