Meanwhile, eARC (enhanced ARC) adds support for the passthrough of higher bandwidth audio like Dolby Atmos, as well as 5.1 and 7.1 surround sound ... devices like a cable box, PS5, or Xbox ...

A cable used to send audio CD sound to the computer's sound card. When playing audio CDs, CD-ROM drives output analog sound to both a headphone jack and external connector just like a CD player.