The ROG Maximus Z690 Formula’s audio system also includes a low-dropout regulator for more efficient power supply of the SupremeFX ALC4082 codec, as well as an ESS ® 9018Q2C DAC .
The audio circuit is physically separated on the pcb to isolate it from electrical noise created by components present nearby. This is standard practice for manufacturers who care about the quality of onboard audio media. Without isolation of the audio components, unintentional electrical noise can be introduced into the audio line, creating unwanted hissing and static sounds.
Read more @ Pause Hardware (French)