It would be possible, but the only way currently available to disable digital bass management on the 7.1 Direct input is to set the speakers to "large" in the 990's speaker configuration menu, which leaves you with no bass management for digital sources. Several of us have suggested that it would be worthwhile to see a way to disable digital bass management of the 7.1 Direct input without setting the speakers to large, but I don't know if it will appear in a firmware revision down the road or not.