If the sound mode is set to Multi Channel Stereo, Denon/Marantz apply specific bass management. This means that BC and ART will not work.
The AVR applies the levels, crossovers and delay time calculated by Dirac Live for the playback.
For more information, please visit the following pages:
Denon
https://manuals.denon.com/DiracLive/NA/EN/DRDZSYktvnhzad.php
Marantz
https://manuals.marantz.com/DiracLive/ALL/EN/DRDZSYktvnhzad.php