I have a TV with no HDMI ARC and I have a Samsung HW-M450 soundbar with an option to buy rear speaker (Samsung SWA-8500S) to make it 5.1. I have read that optical cable wont be able to handle 5.1 audio and my best way is to use HDMI ARC. The Samsung HW-M450 has HDMI ARC Out and a HDMI In. My...