I was re-reading my manual last night in light of Gonk's recommendations. In the section on the Bass Management Selector Switch (pg. 8), it states "Three position toggle switch for selecting how the Model 970 routes bass signals for the DVD 7.1 multi-channel analog inputs ONLY." [emphasis added].

If this switch only applies to this input, does that mean that for all others, bass managment is handled digitally, regardless of where the selector switch is positioned?

If that is the case, I think routing the CD player through this input and selecting the HPF/LPF analog filter might work, as 80Hz is my crossover-point of choice for the front speakers.

Still waiting for my replacement tweeter, so I have not had a chance to experiment with any of the above.