Type of audio file that has three connectors: two for the signal to land and a general system. It is a connector that is what insurance usually found in audio and video equipment of high quality. XLR connectors are named for their pinout: 1-eXternal 2-Live 3-Return.

Connection between controller and projector and between one projector and another must be made with 2 core screened cable, with each core having at least a 0.5mm diameter. Connection to and from the projector is via cannon 3-pin XLR plugs and sockets which are  included with the projector.