GIK acoustic panels

Just installed some GIK bass traps in the room corners today and instantly solved the "sonic boom" that was happening around 35hz.A 2'x4' 244 panel in all four corners did the trick.Easy peasy:)I've got three 242 panels(for reflections) a 7" thick " monster trap ",and 4 2'x2' spot panels to fool around with now.The monster trap is VERY effective.I amused myself moving it around and could easily hear the changes.The front wall behind the speakers is the recommended position but it made the room sound dead, surprisingly.Another surprise was when I propped some panels in front of the two large windows in the room - no change at all.
So next up is getting them at the wall/ceiling junction and possibly on the ceiling without having a zillion nail holes to fill later.The panels all come with eyehooks and picture wire to hang them up.Good thing the room is not too big.16x17 cube unfortunately,so it needs a little help.I'll post the final results in a few days for those of you who are curious like I have been but hesitant.