Good morning. I have a soundbar, LG model LAS551H, connected to a Samsung TV, model 49MU6290. I have the soundbar connected to the TV via HDMI ARC. When I go into the TV settings for the soundbar the only Dolby choice is DTS Neo 2.5. The other Dolby choices are grayed out. I am not too familiar with Dolby and I was wondering if there is something wrong as to why the other choices for Dolby Digital Plus and DTS 5.1 are not available. Is this correct as to how it should be? Curious as this is my first TV/Combo not using and optical cable. Thanks and have a good morning.