I bought an Apple TV 3rd gen for my bedroom, and the sound from my 24" LED TV was rubbish, so I bought a basic sound bar (Philips HTL2100/12). My TV's only audio output is 3.5mm headphones or SPDIF coax. The sound bar takes coax AND optical inputs. So my questions are: 1) Would I best to use Apple TV > sound bar via optical, or TV > sound bar via coax? (I should add I ONLY use an Apple TV, no other devices will connect to the TV at all) 2) What settings in the Apple TV Video/Audio menu should I set? Dolby Digital on/off/auto? My content (streamed from MBP's iTunes) is a mixture of HD movies/TV shows with 5.1 AC3 audio and SD TV shows with 2 channel audio. Details of the sound bar here: http://www.philips.co.uk/c/home-cinema-systems/htl2100_12/prd/ Thanks!