Hooking up a NAD 3020 v2 to a PC

Hi, first time poster. 

I just bought a NAD 3020 v2 integrated amplifier and have Celef (Proac speakers) to go along with it. 

I hooked up the system to my PC by simply using the PCs audio out and plugging the cable to the auxiliary inputs on the NAD. Dumb question: Is there a way to bypass the soundcard from the PC and use NADs DAC instead? The PC doesn't have an optical output and the NAD doesn't have a USB port.

I am just trying to get the best sound using Qobuz on my PC. Thanks in advance.