Through our “Phantom Control” technology, the Nexus C-6 requires no special control wiring and integrates easily into the same 4 wires used to drive your speakers. The K-8 and K-22 LCD keypads simply connect between the C-6 control unit and the speakers and provide you with all the control required for the system. Whether you are installing new or integrating into an existing wiring scheme, you will find the C-6 easy to install. No extra control wiring beyond what you must install for your speakers makes for trouble-free installation.