For the Onkyo 797 i've found that i can't play anything under 50 or 55 using the absolute volume option (i.e. max at 100). In fact, to play music or movies at the levels i prefer i've had to set the volume around 65-75 which i found to be quite surprising.
Offhand i didn't notice a difference with Black Hawk Down however i did not watch another dvd until the next day so i can't say i conciously remember any volume issue.
Great movie if you want to go to bed shell shocked though. I swear i had battle fatigue myself after the first hour.
