Check around your area to see if you can find a local builder. I found a guy via FaceBook (which I never use for such things) and he built panels and bass traps for a fraction of the cost of some of the ones you'll see offered. Granted, there's nothing wrong with those services, room correction, etc. Please don't hear me dismiss that. But I was able to build, add, and add a few more, finally with 2 diffusers for several $100 vs. thousands. And custom made, same insulation options, and I was able to get the precise sizes for my room.
