Wiring diagrams   |   Audio multipairs   |   RECTANGULAR AUDIO CONNECTORS ILME RECTANGULAR AUDIO CONNECTOR SYSTEMS 40-PIN central grounding up to 12 channels Ch. No. Hot + Cold - Gnd. (shield) 1 1A 1B 2 1C 1D 3 2A 2B 4 2C 2D 5 3A 3B 6 3C 3D 7 4A 4B 8 4C 4D 9 5A 5B 10 5C 5D 11 6A 6B 12 6C 6D For inputs see chart. Returns starting with last pin: Return1: Hot = 10A, Cold = 10B, Gnd = Return2: Hot = 10C, Cold = 10D, Gnd = etc.