Magic eye pictures with hissing sound?

hi folks,
i am trying to use magic eye with 2nd tv, picture is working fine but their is a loud hissing sound all the time , like interference, channels are changing fine.
tv was only bought a few days ago, and it will work fine if i just want to watch whats on the main tv from the scart cable off the Sky box with so sound issues, its only thru the magic eye i have the sound problem
please help ?