HG-688X 5.1CH Audio System Audio Decoder USB Sound Card HDMI Optical Coaxial | eBay
Sound Blaster AE-9 review: do you really need a sound card in 2019? | Eurogamer.net
Using your GPU as a Sound Card (nvidia rtx HDMI with 5.1 A/V Receiver): Full Setup Guide - GPU Audio - YouTube
microware 5.1 Audio Decoder USB Sound Card Bluetooth Receiver For Optical Fiber Coaxial Media Streaming Device - microware : Flipkart.com
External Sound Card with Volume Control, Multimedia USB Controller Knob, USB Audio Adapter with 3.5mm Headphone and Microphone Jack, for Windows, Mac, Linux, PC, Laptops, Desktops - Newegg.com
How to connect HDMI output audio to a 5.1 surround speaker which has 2 channel RCA input - Quora