Hello forum members! This may be the easy question but I couldn’t find the solution myself.

I’d greatly appreciate help from members. So here is the problem. I have connected amazon fire stick to HD621 and HD621 is connected by 3 coax cables to MD1 of 861. I’ve configured Output rate 2x (96k)=Yes in HD621 and HS = Yes in 861.

I can hear 5.1 surround from 861 but it only plays 48k. If I switch off Dolby digital in Fire TV Stick setting, 861 plays 96k in PLII Movie mode.

How can I fix this problem to have 96k surround sound?

Thank you for the all the helps.

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