Martin Logan MOTION FX Guide De L'utilisateur page 6

Fig. 7A
Fig. 7B
6
3 Mark the pilot hole locations.
4 Drill the pilot holes using a 1/8-inch drill bit. If
a pilot hole DOES NOT hit a stud, widen that
pilot hole using a 1/4-inch drill bit and install
a wall anchor at that location (fig. 7A & 7B).
5 Using the 1.5-inch Phillips screws, mount the
wall brackets as shown (fig. 7A & 7B).
6 Hang the speaker, guiding the wall mount bolt
into the wall bracket's keyhole.