The recommended setup in the manual suggests going STB > HW-E450 > TV, all HDMI connections. It has the advantage of using pass through instead of ARC to play nicely with non-Samsung products, as sometimes non-Samsung products balk when interfacing with Anynet+, which ARC runs under as a feature. However, it has the disadvantage of having far fewer ports than you'd otherwise have, which for some people isn't a problem.
I have recently purchased an ES7000 TV with the HW-E450 sound bar.
I have the sounbar connected to the TV via optical and HDMI but I cant get the sounbar to turn on with the TV. It turns off ok.
I also have a sky+HD box but that is going HDMI to TV, should I go through soundbar?
Please let me know the ideal setup.