I think there are a couple of re-clockers and electrical filters you can add between your Mac Mini and your dac. This could improve the sound.
Sonore also has optical networks that will reduce the risk of any electrical noise going into your dac. A bit expensive but may be a perfect solution.
https://sonore.us/opticalModule-Deluxe.html
Sonore also has optical networks that will reduce the risk of any electrical noise going into your dac. A bit expensive but may be a perfect solution.
https://sonore.us/opticalModule-Deluxe.html