L-Acoustics X12 Owner's Manual page 47

When securing the U-bracket horizontally, make sure the hooks are oriented upwards.
Fasteners for wall-mounting or ceiling-mounting
Secure the bracket with three M10 screws.
Select screw length and anchors applicable to the wall or ceiling properties.
2. Secure the U-bracket to the wall using M10 screws.
3. Lift the enclosure by the knobs and place it inside the U-bracket.
Adjust the knobs on both sides so that the safety washer is between the hook and the enclosure.
4. Push until the knobs are locked inside the spring-lock safety mechanism.
X12 owner's manual (EN) version 1.0
SHLAK!
Rigging procedures
47