I am trying to install a Sony HT-CT290 soundbar to an Emerson LF391EM4 TV that does not have an ARC or HDMI ARC connection. P

[samikay]

I am trying to connect a Sony HT-CT290 soundbar to an Emerson LF391EM4 TV without an ARC or HDMI ARC capabilities. Please help!

 

[americanaudiophile]

TV has coax digital audio out. Check the TV manual on how to configure it in the TV audio menu.
Soundbar has optical digital audio in.
You need to convert one to the other.
https/www.amazon.com/C2G-40018-Coaxial-Optical-Converter/dp/B0002J2MV4
These only work in one direction so an optical to coax converter won't work for you.
You also need an optical audio and a coax digital audio cable. Most composite video cables will work for coax digital.