Have you double clicked on both devices in Dante Controller and confirmed that the sample rate is the same in the “Device Config” tab?
Yes, EVT-H9K and MacMini are both at 48kHz
More clocking information can be found here: https://cdn.eventideaudio.com/manuals/h9000/2.0/content/expansions/dante.html You’ll have to try a few configurations and let me know everything you have tried so we can rule out what the issue may be.
When I check “Enable Sync To External” it looks like this :
