The comparision after/ before the treatment is night and day.
I use the room for mixing (sometimes for ac guitar recordings).Before treatment ,the room was basically useless, and (very common)I was blaming my ears and monitors.
If you follow all advices,with enough number of bass traps (rockwool 4" in the corners, panel in the RFZ and 6" above my mix position, in my case) bass response and, principally, bass reverb (that causes all the boominess and "one bass note" sensation)will reduce drastically.
(Monitor distance of rear/side walls, distance woofer/floor, separated stands,my mixing position at 38% ,a lot of measurements... these things had a big impact in my final result).
I´m satisfied (altough I need a better treatement to the rear wall).
Ciro
www.soundclick.com/openstation
*I forgot: I have a panel trap for deep bass frequencies too.