There are a few companies that make nice kits for a fair price. The fit and polish after completed look very pro. I would just Google diffuser kits and your there. Has far as wasting time and money. Treatment such as this can be a crap shoot so if they don't achieve what your looking for sell them on the Gon.
Diffusers for magnepan speakers
Looking for thoughts on building a skyline diffuser panel the same size as a maggie 1.6 to place behind speakers. Asking for advice because my online reseach mentioned a 2x2 panel for general specs. i do not want to waste the time and money if it would not sound good. I am thinking about three 2x2 panels placed on stands behind the speakers about 3.5 feet. Any thoughts would be appreciated.