@kota1
while room treatments can make a great improvement in the sound.....i think you have to look at the bigger picture here when it comes to this and this is the OP better half. I highly doubt she is going to let him do this.
there was a time ( at another house ) where i had the system in the living room and i told her that members talk about room treatments and how it helps the sound, and she was perfectly fine with panels on the walls......it was when i mentioned hanging panels from the ceiling is where she drew the line.
my other half is ok with panels on the walls....but how many times have we all read on here that panels are not allowed on the walls due to the other half not accepting them ? honey, its ok if you want to be in this audio hobby and spend all this money on equipment to listen to music, but heaven forbid you do whats next. to me, it just doesnt make sense.