Lrsky you are correct for tilt chart we measure from face of speaker
((Can you explain further how measurements to the front and side walls are used when referring to the tilt chart?))
Excuse me I Meant the Grid chart in the owners manual for uniform in room response position.
As the grid shows mesuring from the middle of speakers to walls
RussB((How doses the angle of the speaker affect the tweeter response if the speakers sound a bit on the bright side????}}}
With more tilt back we change the angle of the tweeter, mid range, and bass drivers. this allows for a more precise transision/blend and will seem to smooth out the top.
Try listing to just one speaker if its brite
slouch down in your couch until its right
then adjust the speakers tilt back to be correct where you are at normal seating height.
Try a level laser pointer on top of the adjusted speaker pointing it behind your chair put a band aid on the wall where it lands now adjust the others speaker's tilt back to the same height so that both speakers hit the same mark.
Cheers Johnnyr