It looks like a nice big room in the photo. I find it hard to believe you don't hear a huge difference when you close the drapes behind the sofa. If the drapes are made of light weight material you may want to find something heavier. Drapes can make good room treatment too and you can open and close them at will. The wall of windows is an obvious problem. The louder the volume the worse it gets.
I found a photo from CES 2008 showing Rockport speakers with woofers firing to the inside. I know it can be harder to get side firing woofers to work with your room.
http://blog.stereophile.com/ces2008/010908rock/
I found a photo from CES 2008 showing Rockport speakers with woofers firing to the inside. I know it can be harder to get side firing woofers to work with your room.
http://blog.stereophile.com/ces2008/010908rock/