Connect PC 5.1 speaker set to Mac?

If I want to connect my old PC 5.1 speaker set (with 3 cables, for center/bass, rear, and front) to a MacBook Air, what would I need?

An external (USB) sound card?

I saw a post that did exactly what you want. They used the headphone jack and two usb-c to headphone jack adapters to output 5.1 surround sound. I’ll keep looking for a link.
Found the link:

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Interesting!

I didn’t think that could work…