My new Mits DD8040 has a 'black level' on/off toggle in the mode menu. My set (Tosh57HX81) easily looks better with the control set to off. Blacks are deeper, colors appear more saturated, and the picture looks almost 3-D. What exactly is this control doing? My old Toshiba SD-5700 did not have this control, but was able to display the THX backdrop in the Optimizer menu. The new player does not. Thanks for any replies... BTW, the picture improvement was well worth the expense($188).