Sorry Bryan, my bad.......sometimes what looks okay in my head loses cohesion while articulating it
This better represents what I was contemplating:
The two gray funky looking panels are what I was thinking of building with about ~3 inches of Roxul each. Those would then be flanked by regular flush-mounted panels 2ft x 2ft to treat the first refections from the mains.
And just so I'm certain of your direction, I would stuff these areas complete with the mineral wool(pardon my photshop skills!!):
And then go on to place 2" thick wool against the only the two wall faces behind and beside the mains as so:
Hope this helps to better visualize where I'm at
, and I very much appreciate your assistance!!!