I was doing a live mixing for a church event. I had 3 cameras hook up to a mixer and project through a projector. There were lines runing across the screen. I was talking with the audio guy and he was telling me tat's smthing about the imbalance of AC output for the cameras and the projector. I had no idea what he was talking about because I dun have any electrical background. Would someone please explain to me wat was happening and why would be the solution for such problem.