Zgemma h9s sound

I used to go trhough tv, had optical cable from tv to soundbar then the box audio should come through soundbar in same way as tv audio
 
Same as Grog but had to convert coax to optical depends what the TV has!! and what soundbar accepts.
 
Thanks.the problem is I have o projector insead of tv, I have tried the hdmi splitter and the hdmi to rca but didn't work
 
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