You could also mount the metal bracket to a bearing plate (could be a piece of 4" x 8" x 1/2" MDF or plywood) which would be hidden by the speaker and painted the same color as the wall. You could then attach the bearing plate to the dry wall using several fasteners to reduce and spread the load on a larger area of the dry wall. You can install the bearing plate first then install the metal bracket or power bracket to it.

Last edited by Jc; 11/25/15 06:01 PM.
jc