Room is 24x16 and 10ft high.
Fixed 147" scope screen.
Tower speakers on sides of screen and center channel below the screen.
Front 12' of the side walls have 2" floor to ceiling and back 12 feet has alternating 2 foot panel (floor to ceiling) and dry wall.
Everybody on this forum uses 1" treatment only up to ear level. I think I messed up. Back wall"s 4" treatmaent does have plastic sheeting covering.
Thanks for your kind advice.