The Neumann AC 30 Adapter Cable is a Y-cable to connect two active capsules, e.g. AK 20 and AK 40 as MS stereo couple directly to the MTX 191(A) matrix amplifier. XY or MS signals are then available at the XLR 5-pin output connector of the MTX 191 (A).
The recording angle is electrically remote controlled. KM 100 output stages are not required. Markings: yellow for channel 1 (cardioid), red for channel 2 (figure-8).