hello everybody
first post on here, looking for some help with room acoustics-
I have a Tag Mclaren av32r pre-amp for stereo and av duties-source is Tag Mclaren dvdflr32, Amp is Tag Mclaren 100x5r monoblock,this feeds Neat Mystique fronts,Neat motive centre and Neat critique rears, Sub is Acoustic Energy.

Please refer to picture-
Room is 484cm long, 287cm wide, 231cm height and its a bedroom!!!!!!!
Floor is wood covered with thick underlay and a medium thickness carpet, two walls are block and brick (window,rear) and two walls are partition with plaster board and wooden frame(front and right side).
Problems are a bass which seems to be all the same-low bass and mid bass roll into one and sounds bloomy, not much of a soundstage and recessed mid sounds -Vocals swamped!
What would be my best starting point ? i have used bobgolds mode calculator and read Practical Domestic Room Acoustics by Adam P.salisbury but it doesnt mean much to me at the moment!
thankyou for any replies