Question Help getting 5.1 Surround Sound to work

[L0N3STARR]

Hi all:

I consider myself decent at Audio / Video stuff, but this all is going a little over my head, so I'm hoping I can get some help.

First off, here's what I have:

6 in 2 out HDMI Switch (True Matrix SPDIF Splitter)
https://smile.amazon.com/dp/B07B3R9PD9/ref=cm_sw_r_cp_apa_i_J5S9FbN1WWT0B?_encoding=UTF8&psc=1

I have the inputs of this HDMI switch connected to:
Roku Ultra, Xbox One, PS4, Nintendo Switch, PC, and another HDMI switch with NES Classic, SNES Classic, PlayStation Classic.

The outputs go to an elgado HD60 Pro and my projector.

My projector is an Epson Powerlite HC2030

Then I have the 3.5mm audio out from the projector connected to the RCA L/R audio inputs on my AV receiver.

AV Receiver is Sony Bravia DAV-HDX265.

I don't currently get 5.1 surround sound. I'd like to. What do I need to do?

My HDMI switch already splits out the audio into SPDIF optical. Do I just need an SPDIF to RCA L/R converter to my receiver? Or do I need something else? I'd appreciate any help! This is not my forte unfortunately! Thanks in advance!

 

[Lutfij]

RCA's will always provide Left and right audio, i.e, stereo. What is the make and model of your audio equipment? If the source of your audio and/or it's intermediaries are remotely stereo, you're going to get stereo audio output.

 

[L0N3STARR]

RCA's will always provide Left and right audio, i.e, stereo. What is the make and model of your audio equipment? If the source of your audio and/or it's intermediaries are remotely stereo, you're going to get stereo audio output.

Like I'd said above, it's a Sony Bravia DAV-HDX265. It supports Dolby Digital in a few ways. That's actually where I get a little confused, and why I'm not exactly sure how to do everything. It has Dolby Digital and Dolby Pro Logic (II) and DTS, I think?

So the AV receiver only has Red/White L/R inputs but the receiver has 5.1 surround, with 6 speakers.

Here's a link to the site with manuals and stuff.
https://www.sony.com/electronics/support/product/dav-hdx265/manuals