Just got a message from tech support that says the 990's bass management "works as intended", but they are looking into the "L/R+SUB" engagement when crossed over a certain way.

Hmmm. Full range output to the sub on "bypass" mode from an analog signal path is the intended function of the bass management? I am wondering what bypass really means then. Guess I will have to wait until Steve gets back from lunch to find out.