Sound cards don't reproduce 5.1

[Xiwi]

First of all this is my hardware:
- Pioneer VSX-321 5.1
- Motherboard Gigabyte Z97X-SLI-CF (it supports 7.1)
- PCI sound card Ewent 7.1 (https://www.ewent-online.com/ewent-ew3752-7-1-geluidskaart-met-spdif.html?___store=ewent_nederland_nl)
- Windows 10 Pro

I updated both drivers and I tried the motherboard connected with a HDMI cable. I configured the speakers to reproduce 5.1 but subwoofer and central speaker don't work.

Same thing with the sound card but this doesn't have 5.1 mode, just 7.1:

I could try with analog cables but prefer digital.

Things I tried:
- Connect the right speaker to central one to check it wasn't broken.
- Connect the home cinema to a TV and no problems
- Different sound cards (motherboard and PCI)
- Different cables (optical and HDMI)
- Different configurations

I understand S/PDIF doesn't have more than 2 channel but it should be fine with the configuration on the right (also I can hear sound from speaker behind me so atm I can hear from 4 speakers, not just 2).
Also next optical connection (you can see 2 on that sound card) doesn't have any inner light as the other one and I'm not sure what is this connection for.

Any ideas?

 

[cin19]

Because you had the pioneer receiver, just forget about the sound card, the receiver is better than the sound card, use HDMI connect your PC to the receiver, I think the receiver should have that HDMI ports.

If your don't have the receiver, you will need the sound card.

 

[Xiwi]

Because you had the pioneer receiver, just forget about the sound card, the receiver is better than the sound card, use HDMI connect your PC to the receiver, I think the receiver should have that HDMI ports.

If your don't have the receiver, you will need the sound card.

I think my computer is not related to this.

Found a test button on my remote control and I can't get sounds from these 2 speakers (again this isn't connected to my computer, just the speakers and the AV).

I've been doing a lot tests...

- I opened the entirely amplifier to clean everything
- I blow up inside the connectors (maybe stupid but it "used to work" with my Megadrive )
Tried again everything and magically, central speaker was working again! Not the subwoofer
- Tried the subwoofer on different connections and it's working, so not faulty

At some point everything stopped working so I thought it might be something related with static electricity and I took off the main cable and put it on the floor. Again, all working (except the subwoofer).

So at least we have 1 of them working (but not sure how tbh)