I have noticed both with my HD81 and now my HD81-LV the processor box gets very, very hot during normal use. As with many of us, my HD81-LV processor is in a rack in an equipment closet. This closet has good ventilation, but even if I keep the door open, after 2 hours of normal tv/moving watching, it is incredibly hot...even to the touch.
Is this something that others experience, as well? Is it normal? Do you avoid stacking anything on top of the unit? I am told that the unit is stackable, but it is so incredibly hot I wonder if that's really a good idea.