I have a Sharp Aquos LC-52D64U Could you please advise how to turn the internal speakers off on this model so that I can attach a sound bar. (If this is the problem). The sound bar is connected to the TV through the digital audio output terminal but will not play sound. (in absence of HDMI-arc.) The only audio adjustment is the variable or fixed option mentioned in previous discussions and changing to variable doesn't get me sound on the Beam. There is no other setting on the TV menu. SONOS has determined through diagnostics that the Beam is connected to my TV properly through the digital optic output but I still get no sound from the beam
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