I am using; http://www.samsung.com/us/video/tvs/UN55C6300SFXZA http://www.samsung.com/ca/consumer/tv-video/home-theatre/home-theatre-systems/HT-D550/ZC Along with a DirectTV HD-DVR, Xbox 360 and ps3. I still cannot get 5.1 to play. I am using a Toslink cable coming from the TV to the Home Theater. The home theater is set to Digital In. Everything going INTO the TV is using HDMI. Where am I going wrong here?