Emax

I have owned 4 Emax I units (2-keys/2 racks) and on all of them no 
matter how good or bright the backlight the contrast was always angle 
dependent.
Both the racks had the little front panel hole for contrast and 1 of 
the keys had the pot on the Digital board for contrast.
Is the contrast always angle dependent or do some of you have displays 
that offer mulktiple viewing angles?