You can connect two CS-SOLO units to a single port on the MIX-16 or MIX-32. The first mixer is the blue “A MIX” while the second unit will be the red “B MIX”. Power and audio is supplied to the second CS-SOLO over a network cable connected to the CS-SOLO THRU port. The CS-DUO must be connected directly to the MIX-16 or MIX-32.