Logitech z906 surround

Dec 24, 2018
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Hello, I just purchased a logitech z906 for my sony tv xbr-55x850d. I hooKed an hdmi cable from dish box to tv. I then hooked a digital optical cable from the logitech to the tv. I cant get any sound. I went to tv audio options but nothing seems to work? HELP!!! And Thanks!!