Hi Brian
Thank you for the response. If I push the display button on MSR remote, my center speaker (DSP5500HC) displays MHR 48k. My 861 won’t upscale to 96K. I tried this configuration with G68D, G68D won’t upscale the sound, neither.

Room1 - 861v4, HD621, 7000, 5200HC, 3100, Oppo BDP83, MS600, MD600.
Room2 - DSP5200.2, MS200, Rythmik Sub, G68D, HD621