Ah I see that short wall is a closet - .... cool then you'll get the benefit of more space as well. Good luck on your set-up

You can turn the closet into an enormous bass trap if you want.

You don't want to be seated in the middle of the room.

I'd set your desk the way you have it in your picture but a bit closer the end wall (opposite the door) so your ears are somewhere between a third and half the length of the room from the end wall.

Blankets and the like will only cut high frequencies. They'll sound like there doing something useful, by deadening things, but they may do more damage by screwing up the frequency response of the room more than helping it.

With the desk like it is, you need 4"+ panels on either side of you on the walls to absorb the early side reflections.

Have someone hold a mirror on the wall and with you sitting at your desk you want to see your monitors in the mirror. Then hang a bass trap there. There's also a reflection coming off the ceiling for which you can hang a bass trap above you. Try and avoid reflections off a large desk.

You can hang a panel on the back of the door when it's closed.

As mentioned, the corners are where to start for tackling bass/low mids. You won't be able to do much about real bass.

This forum has everything you need to know and a bunch of people more than willing to help. Also an enormous amount of info on making your own bass traps. Just provide your drawing and room dimensions if you post.

You can use the fantastic, free Room EQ Wizard to measure your room's response before, during and after treating it.

There are a lot worse rooms than yours. Enjoy it.

Thanks, Paul.

We visited a friend this week who's been working on his own studio and doing room treatment - actually, his is much closer to a commercial studio than anything. 

Anyway, the good news is that on top of what I had budgeted for the first phase, I'll also inherits his "scraps" - and it looks like he'll have plenty of pretty decent pieces - so it will speed up things.

So far, curtains will be used more for aesthetic purpose than anything - as I intend to remove the sliding mirror doors, I'll replace them w/ a curtain. I still need the closet because that's where I store all the unused gear, guitar cases and such.

I may also use one to run across the entire wall in front of me. I don't need the window and/or natural daylight and it'd allow me to recreate the kind of environment in which I work better, w/o resorting to paint (because painting those uneven walls with the stucco type of ceiling is a nightmare, anyway). Eggshell and daylight are nice, but I need some contrast.

If those two curtains have a slight effect on reflection, it'd be a bonus, but I'm not counting on them as a treatment device. 

You mention the door and it's funny because I thought I could do something like that last night. 

Of course, the idea is to make adjustments as we go and to proceed methodically. For example, I wanted to wait and make sure that there wouldn't be any major modification to my setup once I start doing room treatment, and that I would be adding a rack or something, which would force me to move things around and which can end up having a significant impact in such a smaller room.

For example, I wanted to wait until I had my display and see how my desk configuration worked. And I had to reconfigure things a bit, indeed. This week I'm picking up a new audio interface, which allows me to get rid of my mixer and preamp - which means I won't need a desk extension, and such...

But I think we'll be ready to begin any moment now. :)

Thanks for the links!