Robert F Jarvis
Well-Known Member
We are projecting animations onto the cyc. The MP4's have audio we want to pipe to the desk. When I plug the laptop output sound into the board the sound is great. But as soon as I plug the HDMI cable in we get a horrendous earth loop hum! I checked the projector and sound board power cables are grounded properly though one is FOH and the back stage. I removed the laptop charger but his made no difference. Ideas' suggestions welcome. I have to go in tomorrow early to fix this and not sure where to start.