I designed and built this wall-mount system for my homemade Owens-Corning-703
acoustic panels for less than $10 using (oak-faced) 1/2 inch plywood, a 2"X4", some screws, 2 hanging brackets,
4 felt adhesive pads and 4 angle braces. It brings the (self-covered) 2"
OC-703 Acoustic Panel 4-1/2 inches away from the wall with a bare minimum of the panel being blocked, front or back.
Remember that this is what works for me and you can build these in whatever
capacity works best for you. For example, thicker OC-703 panels will provide better absorbtion, especially into the lower
frequencies.