So basically my setting is just correct or it just doesn't matter since 2.0 lang my speaker? Just chose spdif, enable pass through and just select 2.0, it will just be the same. So if I change my soundbar which I'm planning to do to a 5.1 soundbar with 4k pass through, then what setting I need?
What about the frame switching?
I cannot tell how to do it in kodi since I am using a SPMC build targeted specifically to my Nvidia shield box. But frame rate switching is an important thing when for Video viewing.
Try looking at system - video - playback.
But I am sure it under system. I cannot recall where.
A full 5.1 surround setup usually involves using HDMI.
Again. Your soundbar cannot decode 5.1 signal unless it has a real 5.1 surround decoder chip in it and not just surround emulator chip. If your sound bar is 2.1. I do not think it has a real 5.1 surround decoder. There are soundbar that says they have real 5.1 decoder chip but so far they have its own issues.
Basically your soundbar receivers a 2.0 signal from your Spdif cable and do some processing with its built in chip to output sound at different timings to emulate 5.1 surround sound.
If you want real surround sound either you get a AV receiver with all the 5.1 surround format support. Or a HTPC with a soundcard with rear, center , front speakers out + amplifier.
Usually people get an AV receiver to simplify things.