Home Theater

I have a TV, which has a HDMI IN
, set up box has HDMI OUT
and home theater has HDMI OUT. I dont have HDMI IN to my home theater system.

When I connect with analog audio cable from my set up box to home theater, I am getting sound from both TV and home theater system. And also for video I have HDMI cable connected from setup box to TV.

Is there a way to avoid sound from TV? Please help me on this. Your help would be greatly appreciated.

Thanks Shrey

Grace