Galaxy Audio LA4/LA4PM Yoke Bracket - Manual (Page 3)

2. Select the appropriate holes in the yoke for the tilt angle desired.
Available angles are: 90 degrees (level), 10 degrees or 15 degrees of tilt.
(See photo below.) The yoke may be mounted to the wall upside-down or
not, to provide upward or downward tilting at both angles.