This is some sort of post-topic to this:
I got myself a splitter as suggested in the above topic and have a partial success as I’m getting 5.1 sound on the optical output of the splitter for my cable box. However I’m not getting 5.1 when I plug in my Chromecast and cast Nextflix on it. Per this: https://help.netflix.com/en/node/23924 for proper 5.1 sound from Netflix I should be getting 5.1 from Chromecast which is not happening, at least when I use it with the splitter. Do you guys think this is a Chromecast issue, Netflix issue, splitter issue or a combination of those? Any ideas appreciated, thanks!