Thanks Ian.

Just curious, why does the Listening Window need a downward tilt in the first place ? I am starting to suspect that one of the reasons I keep gravitating to the bookshelf speakers is that they tend to have a flat-ish LW while the larger speakers tend to have more of a downward tilt.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8