is HBO's audio being sent as dolby digital? that would likely be the reason.

re: # of filters. is that per speaker (!) or for the room. in my room, the 861 is using 8 filters per speaker for a total of 56 filters. I will try it with me sitting in the room. and see if there is a difference...

Best regards,
Jerry
Main System: 861v6, DSP8000s in corners, DSP7000s Center and Sides, 1-9 humans.