Here's my GIK treated room.
8 x Tri Traps in corners.
4 x Monster bass traps with range limiters on walls [black panels].
4 x Monster bass traps with range limiters behind curtains in front and rear window.
2 x Monster bass traps full range on wall first reflection point.
2 x 242 panels on ceiling at first reflection point.
All done with help from GIK.