Updated 07/3/2018. This solution works in High Sierra 10.13.6 as well as several previous versions of MacOS. I didn't create the tools I only figured out how to use them. Credit for the kext goes to andrejkw at macrumors. Your mileage may vary but this is the easiest solution I've found. I've used it for years & its worked for many others. Definitely worth a try.
1. Download package located here...
Clover HDMI audio for NVIDIA & AMD cards. Easy way.
1. Download package located here...
Clover HDMI audio for NVIDIA & AMD cards. Easy way.