How do I acoustically treat this wall? It meets the middle of a window in the corner.

[AASteveo]

So I just moved into a new place and the room I got was added afterwards with a wall that touches a window. It's unpleasant because that wall divides my room and the living room (where the TV is constantly on). But there's a big hole right where the wall meets the window in the corner.

Here's some pictures:
http://i35.tinypic.com/300hb1j.jpg
http://i38.tinypic.com/f3azrm.jpg
http://i33.tinypic.com/dqhqtd.jpg

I can't do any permanent damage to the walls because I'm only living here for like 6 months. I was considering just shoving a bunch of foam against the window in the hole and then covering it with some wood, but there's probably a better way.
Any suggestions?

[Ethan Winer]

Unless sound leaks through the small gap by the window, and that leakage is a problem, you can just ignore the gap. It's too small to have much acoustic affect inside the room.

--Ethan

[AASteveo]

Yeah it's just the leakage that's the problem because the TV is always on in the living room and I mix a lot in my bedroom. I guess I should have said "isolate" instead of "acoustically treat."

[Ethan Winer]

In that case you need to block the opening with something rigid like a sheet of 3/4 inch plywood. Stuffing foam in there will help a little, but not as much as something more rigid like wood or MDF or a strip of drywall.

--Ethan

[Scott Mix]

What is the best way to acoustically treat a square room when you can not build from scratch and u cant build new walls with a budget of only $300 11' 9'' x 9' 3'' my room. It shaped like a diamond because of the way my workstation is set up. just picture the infield of a baseball field.... I have my desk and speakers at the front corner (2nd base). a window in between 2nd and 3rd and a window in between 1st and 2nd. in between 3rd and home plate i have a trophy case attached to the wall 1' 4'' in width x 5' 6'' in height. to the right of home plate i have my door to go out to the hall w

[Ethan Winer]

For $300 you'll need to make your own treatment, which is not difficult. Here's my standard blurb which will get you 99 percent of the way there. All rooms need:

* Broadband (not tuned) bass traps straddling as many corners as you can manage, including the wall-ceiling corners. More bass traps on the rear wall behind helps even further. You simply cannot have too much bass trapping. Real bass trapping, that is - thin foam and thin fiberglass don't work to a low enough frequency.

* Mid/high frequency absorption at the first reflection points on the side walls and ceiling.

* Some additional amount of mid/high absorption and/or diffusion on any large areas of bare parallel surfaces, such as opposing walls or the ceiling if the floor is reflective. Diffusion on the rear wall behind you is also useful in larger rooms.

For the complete story see my Acoustics FAQ.

There's a lot of additional non-sales technical information on my company's web site - articles, videos, test tones and other downloads, and much more.

--Ethan