I just bought this audio system, and i wanna connect it with my PC by optical port. But i don't know how, and my mobo "ASUS Rog STRIX X570-e", someone body on internet says i have to buy an sound card supports it. Cuz i'm new so please help. Thanks
I doubt you actually need a dedicated sound card for that. If you look at the ports on your motherboard, just under the wifi antenna connectors, there are 6 sound ports. The one labeled SPDIF OUT is the one you're looking for. I'd say try that out and come back if you have any new questions.