I'm no DIY'er in general but had a decent outcome making 703 panels. They helped tremendously in my room to kill the first-reflection points. I've got a total of four 24x48x2 panels in the room and things are sounding great. I do think that more panels would be too much. You can see a pic of them in my system page.
Owens Corning 703 vs. Roxul Safe 'n' Sound?
I'm going to make some sound absorbing panels to place on the wall behind my listening chair. Owens Corning 703 and Roxul Safe 'n' Sound rigid boards are two choices to make them with. Anyone have experience with both, or even one?