go to this web sight http://www.atsacoustics.com/cat--ATS-Acoustic-Absorption-Panels--100.html.these are real cheap to try,your room looks very hard to me,you can get these roomtreatments and put the big ones behind your speakers,and if wife dont like them you always can put them in the closet when your not useing.all that glass is another thing,curtains with backing will work.i to share a room with family,and the wife let me keep the panels up behind my speaker,there are 4 colors to pick from ,so i let her pick it,as my first reflection i have a nail in the wall and when i want i hang themup,when finished put them in closet,for the price of these there cheaper than building