Cloud Electronics RL-1MB - Manual (Page 16)

RL Series and RSL Series Installation Guide v2.0 16
CX163 stereo control options
The CX163 is a two-zone stereo mixer and has a different remote control
connector to other Cloud units. When using RL Series remote level control
plates with a CX163, the installer has the option of using a single RL Series
plate to control both left and right channels together (i.e., stereo operation),
or of using two separate RL Series plates to control the left and right channels
independently. For stereo operation, use wiring diagram C. For separate L/R
control, use wiring diagram D.