I have found that you can change the speakers from small to large with a macro command but this does not properly do what you are trying to achieve. What you want to achieve is to have the total base management system controlled by the OPPO crossover. OPPO will control speaker size, speaker output,gain and delay.The 990 will simply be passing the 7.1 ouput of the OPPO to the 990 outputs then to your amplifers. To do this you would have to setup 3 sets of macros the other 2 being changing channel gain and channel delay to zero on the 990. This would then be totally bypassing the 990 crossover.I have not figured that out yet. One other method is make the OPPO and the 990 pass the 7.1 signal signal to a stand alone active crossover at the outputs of the 990. This way all 990 sources and OPPO seem same crossover, who knows if the active sounds better than the digital.