That is something I have not seem much talked about. I also have access in the SM to Sub Contrast and Sub Bright, but never really knew how to use these to my advantage. On my set up now, I have brightness at the default of 50 as that gives me the best on screen material look compared to 51 when watching blu-rays. But this also does show that I am only seeing 19 on the black clipping screen ( possibly 18 a little )
If I raise my brightness to 51, I then can see 17 flash a bit, but the real world pictures look a little washed out and not as good. I think from what I am seeing on the AVSHD disk, that 51 is the correct setting, if I could make it a bit darker than it is, but not quite as dark as 50 would be.
Is there any how to's on what patterns to use and things to look for when adhusting the subs in the SM?