Yes, Don, your concern appears to be for the most part unnecessary. As was previously said, the 120Hz crossover for SACDs on the 563 is slightly higher than ideal, but there's no "degradation" and that's the best you can do with your present equipment. Set all speakers small and for the digital connection between the 563 and 501(CDs, DVDs)set the crossover at 80Hz on the 501. For the multi-channel analog connections for your Channel Classics SACDs(do you have the Rachmaninoff 2d Symphony with Fischer?)set the 563's bass management which will do the 120Hz cross for SACDs on the analog outputs.
Enjoy the music and don't be concerned with what you may have read elsewhere.
