Hello all. I am in the midst of making my own acoustic panels. I've finished one, with some minor kinks that will be ironed out for the other 3. I show you exactly how I did mine in hopes it will help others tackle this project and enhance their room's acoustic properties. After a lot of time in a hardware store and a tape measure, I decided against nominal sized lumber and went with 3/4 MDF, and am using 16" OC Roxul Safe n' Sound 3". This insulation holds quite an impressive spec sheet compared to most other insulations. My finished product came out 15 3/4 wide and 47 3/8 long, tightly nestling the batt of insulation with no overhang, bulging, or sloppiness. The frame is rock solid to boot. Still need to wrap it tightly in a dark fabric. I'll upload pictures of the finished product as well as the steps if people are interested.
I want to make the Focals shine.