My first (mostly?) functional mix room

Hello! I'm Mike, and I hail from lovely Chicago, Illinois (USA). This is my first post, but I've been following for quite some time. After reading through the posting guidelines a few times, I believe I've satisfied them: I'm moving to a new place, and will be setting up a room that is primiarily for mixing, though I'll record the occasional guitar or bass in there. No full band tracking in this room. My normal operating volume is around 80-90dB at the high end. I'm not concerned with transmission out of this room, as it's a detached building, and my lovely girlfriend tolerates the noise quite well! :D The existing construction is pretty standard residential stuff. Hardwood floors, painted drywall construction. You can see in the images below that there are several non parallel surfaces in the room, but the basic shape of the room is still a big box. This includes the ceiling, which rises about 5 inches over 10 feet or so. There are two windows: One on the short wall behind the mix position, which will likely be obscured by treatment, and one on the long wall to the right of the mix position, which will likely house a window air conditioner, at least temporarily. I'm mostly in the box with my setup, on Pro Tools LE. I use JBL LSR4328's and the LSR 4312 sub. My budget will be fluid, but I'd like to keep it to $1000 USD or less. If it's going to cost more than that, I'll do it, but it'll take more time, and go in smaller chunks. This is the floorplan: And a couple of sections detailing height: I used the SAE Room mode calculator and came up with the following: [note: I calculated room modes for the big box portion of the room... I'm not sure how to handle the "nook"at this point] Sorry for the small text, but I wanted to get it under the 750px width guideline. Here are potential locations for 24" or 34" superchunks: This is the likely room setup: It looks like the biggest room mode problems will be around 62Hz. There are also room modes around the low E on the bass guitar... This could be problematic, given the fact that I mix a lot of rock music. Am I on the right track using superchunks to tame the low end in this room? I realize I'll need absorption as well, I just haven't added it yet. I'm thinking about using the "mirror" method, and placing broadband absorption. The most obvious locations though are the wall behind the speakers, and the short wall behind the mix position. Is that a resonable method for this room? I am at a total loss for what to do with the "nook". It'd be nice to be able to put a guitar amp or something in there, but I'm also totally willing to do whatever makes things sound best, including stuffing the whole thing with insulation. Do you think it'd be possible to get away with the 24" superchunks, instead of the 34" versions? It'd save a lot of space, and the cost of making them. But, if 34" will be better, that's the way I'll go. Should I lose the subwoofer in my speaker setup? I'm happy to post my SketchUp file, but it is about 8Mb, so it was a bit big to attach to this message. I'm 100% willing to change direction, if I'm not on the right track. I appreciate any advice that will make this room sound as good as it can. Thanks in advance! Mike P.S. I think this post was more thorough the first time around, but the board ate my first attempt! Oops!

Mike - here's an alternative layout that gives you a RFS and a decent rear bass trap.

Thanks, John! I appreciate the layout. My concern is that the door to the room is on the 3'1" section that is covered by one of the "new" panels. (as indicated in the drawing). I assume it would defeat the purpose if this design had to have a new door in the panel? What kind of construction would be necessary for a setup like this? If it would need to be framed/drywall/etc, I'm concerned that the landlord would be excessively irritated, as well as the fact that it would be quite difficult to move the stuff when I finally decide to move from the space. I guess I'm just a little fuzzy on how something like this would need to be implemented to be effective.

sorry _ I missed the door - just reverse the plan.

Thanks, John. This looks like a good layout for me. I did talk to the landlord last night, and she's not going to let me do anything permanent. Can this be accomplished with something like hanging panels? Or does this really need to be framed walls, drywall, sealed,etc? Also, how would the angled ceiling near the "nook" affect a design like this? Thanks for the help!