How should I treat window behind listening chair?


My room is set up using Immedia mapping principal. I use a McIntosh 1700 receiver and JBL Alpha 1 speakers. A window is behind the ideal listening position. The sound is very good and there is no apparent vibration, but I would like to optimize the quality of the sound as much as possible. I'm afraid a drape will absorb too much sound.
heavenboundbiker
I put a comforter behind my speakers over the window and it made a huge improvement. Don't worry about absorbing some sound. It is necessary to get clear imaging and kill brightness.
I use wooden venetian blinds on the windows behind my listening chair. Seems to work well for me.
Thank you all for the excellent ideas. I will experiment with them until I find the ideal solution.