I believe the window is about 6 ft. Behind me. I'm about 12' from the TV and then 6' to the window. It is our front window of the house so I didn't want to fill it in or junk it up
Paint a picture of lovely lace curtains on the wood you fill in the window with. It'll look pretty from the street.
But seriously, this one of those difficult decision moments. You could just let go and do whatever is most aesthetically pleasing according the current standards for room décor. Or, you could try to apply something that improves the sound in the room. A heavy drapery, like thick velvet or insulated multi-layer fabric, will absorb sound, which is only a problem if the space behind the listener is too dead. Our brains prefer some ambience to feel like we are in the real world, so some reflections are important.
You could put some sort of free standing reflector in front of the curtains/drapes, like a two or four panel reflective room divider - angled to reflect away from the listener. Or you could get artistic and make some 6 foot tall modern sculptures from standing tubes or boxes to reflect sound around the room in a diffuse way.
Or... you could completely deaden the entire room and insert ambience through the surround sound speakers by turning on the synthesized sound-fields. Yamaha has the best DSP algorithms for recreating real ambient spaces, like concert halls and clubs. They used to allow you to adjust the intensity of their effect so you could choose a Vienna concert hall and just turn down the effect until it feels natural in your room.
But, ultimately in a perfect world there will be some good ambience in the room. Preferably it comes from behind so you can absorb the early reflections in the front of you and get a better stereo effect.
