Hi again Paul,

Items to double check:

- The multichannel HD sound track is selected from the Bluray disc (not the stereo track).
- Oppo's HDMI (for the port connected to the HD621) audio settings, multichannel, LPCM.
- HD621 settings, make sure it is set for 6 channel (8 channel) not 2.
- 861 settings, make sure audio input for the Oppo (that you use for for movies) is MMHR.
- Oppo to HD621 HDMI cable is fully seated, no broken pins etc.
- HD621 to 861 RJ45 cable is fully seated, no broken pins etc.
- HD621 firmware is upto date.
- 861 firmware is upto date.

Can you let us know in detail all that has been changed (and confirm what has not changed) since the system last as it should?

Regards,
Carl

861v6+ID40, HD621, 8000.2, 7200HC, 7200.2, SKYQ Silver, PS3, PDP-LX6090, QNAP TS870-Pro (8*6TB), Roon, iPadAir2.
[In Reserve] C15, MD600 (2*3TB), TwinStore RM (2*2TB)