Perplexing surround sound issue

I have 2012 Bighorn 3585rl. It came with an Sharp Aquos tv and a Jensen AWM970 receiver. I installed red/white rca plug, 75 ohm digital coaxial rca cable, 5v D.C adapter and an Orei digital audio optical converter. Turned tv speakers off and went to aux 2 on the receiver. Still no surround sound. Please any input would be very helpful. Thanks in advance.
 
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