Do you have a question about the Bose 121 and is the answer not in the manual?
Choose a sturdy surface for mounting, ensuring no hazards like electrical lines are present underneath.
Trace the outline of the bracket holes onto the surface using a marker for accurate drilling.
Dimple the surface with a center punch and drill holes suitable for the mounting surface material.
Position brackets over drilled holes and secure them firmly with specified hardware.
Connect speaker wire to terminals BEFORE mounting monitor in bracket for easier access.
Position monitor in bracket, align holes, and secure with supplied knurled knobs and lockwashers.