room setup

Before answering, how easy is it to move the window?

lmao
mc you never cease to amaze.
 I've been reading these forums for years. Many moons ago you made the statement "everything matters" those 2 words should be at the forefront of every topic.

I would not know the answer, but want to point out that you can disguise heavy drapes or sound treatments into the wall with the window much easier than the other wall(s), in case that matters to you. My speaker wall has a 6-8ft wide window that takes up most of the wall, with thick, heavy drapes that definitely makes a difference in sound quality. 

Good luck

Are you going to acoustically treat the room? If yes, then I would install the window in the rear short wall. Having a solid wall behind speakers will afford you greater flexibility with room treatments (diffuser or broadband acoustic panel or flat panel TV).

Good luck!

lmao
mc you never cease to amaze.
I’ve been reading these forums for years. Many moons ago you made the statement "everything matters" those 2 words should be at the forefront of every topic.

Followed by, and I mean literally the very next comment:

I don’t think it makes any difference.

Now I am lmao!

Seriously, the reason for the window joke is there’s more to a room than the system. (I know, hard to believe.) Even a dedicated room like mine has a door somewhere, and a shape, and that sets a traffic flow pattern, and that is but one of many practical use factors we cannot ignore. Just maybe the sound in my room would be better with the speakers on the long wall. But not much and that one thing would be so greatly outweighed by everything else I never even bothered to try and find out.

"Everything matters" indeed! Including things that have nothing to do with the sound.

btw, which avatar do you prefer? Madame LeModerateur? Or Einstein? I'm leaning Einstein. Though the other one is not without her rather obvious attractions. 

I also have one window in the room.
I needed equallze the sound, coming from both sides, since
the window side was too bright and the other side was too dull.

I treated the window and the corresponding area on the
opposite wall the same way.  I covered the widow frame with
a thin plank of wood from Home Depot, and attached the
same sized piece, at the corresponding position, on the opposite wall.

As I am only married to "pursuing great sound" and don't care about
visual appearance, this is working well for me.  I use decals
to decorate and manage the vibration of the panels.

thanks for the replies. I'm going to try the setup with the window in the rear. If everything goes well I will post pics.

I think the main issue is optimizing symmetry forward of the listening position.  If both short walls are perfectly symmetrical left to right, and in either case, both right and left walls are perfectly symmetrical forward of the listening position, then put the window behind the listening position.   In a room having these dimensions (I'm assuming 8 ft ceilings) you are going to have some challenges.   11 ft is a bit narrow for good imaging, but it can be done.  Treatment of the corners will be important, as will treatment of the front and rear walls.  Front wall treatment will probably be mostly low frequency absorption (preferably limp membrane type panels) and back wall will be aimed more at addressing early reflections. I would opt for absorption rather than diffusion in a room this size.   I can provide more details if you want to take the discussion off line.

OP,

Look into acoustic panels from GIK Acoustics. They offer free consultation, reaching them out while you’re in building phase would be a good idea. 
Good luck!