Integrating Roon and Dirac Room Correction

[Mohmm]

I will add how I solved this problem to spare others the unpleasant experience.

When you play music through this chain all of the elements have a potential contribution to the final volume. So when you have a remote control for your Phantoms (either physical or an app on your phone) check the following items one by one. Be sure to turn down the remote and stop the music in Roon.

1. In Roon set the device volume control to fixed.
   
2. In Audio HiJack: Set the AudioUnit for Dirac Live Processor (DAP) to max or a bit below the max for safety.
   
3. Start Dirac Audio Processor (the real one, not the AU) and set the volume to max or close to max.
   The problem is that the real DAP reduces the volume of its AU without this fact being reflected in the slider setting of the AU. That is, AU may still show max, while the music is low because the real DAP is not on max.
   
4. Mac Audio settings: set Dirac Virtual Audio Device to max in the sound settings.
   
5. Control volume entirely from your Phantom remote.
   

Even Dirac support (not to mention AudioHiJack support) didn’t mention this interdependence between real DRP and its AU. They should know their own recommendations better.
Otherwise, Dirac’s effect on the quality of reproduction is overwhelming. Be sure to give it a try.