Make a cut-out in the plasterboard, +3 mm for easier handling (e.g. 4062 reference (pro) it is 403 mm x 623 mm)
Mount the two long wooden slats (M6 Torx screws)
Feed the speaker cable into the backbox
Guide the installation frame (backbox) at an angle into the ceiling or wall (picture 3)
Mount two additional wooden slats (M6 Torx screws) (picture 4, 5, 6)
Align the backbox in the centre of the plasterboard cut-out and then secure with sufficient screws (picture 7, 8)
Now mount the speaker
ATTENTION: The stability of the ceiling and the plasterboard must be checked and, if necessary, reinforcing batten(s) must be screwed to the substructure and the frame (screw must not penetrate more than 14 mm into the wood) or, alternatively, the additional cerasonar drywall ceiling anti-vibration kit can be used.