Trouble hooking signa S2 to TV that runs on firestick.

i purchased a signa S2 sound bar, trying to hook to a TV that does not have HDMI ARC or an optical outlet port. we use a Firestick to watch TV, my TV does have a digital audio out but it is RCA (coaxial). What is the correct way to connect sound bar? i have tried several different options, none of them has worked.

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