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I just had a potentially stupid idea... the kind that just might be dumb enough to work. The issue is that the desk takes up all but 18" of the "back wall", and that leaves you with not enough space for your speaker stands, correct?

Is the upper shelf on your desk sturdy enough for arm-mounted monitors? If so you could get two single-arm mounts, and use them for your speakers. (I'd buy 2 double-arm mounts and use one arm each for screens, and the other arms for speakers). That way you don't need floor space for your speaker stands and you have the ability to position them pretty accurately. All you'd have to do is either screw the mounting plates to the back panel of the speaker box or (if there isn't enough real estate back there for whatever reason) make some sort of coupling that will support your speaker.

Now that I've presented this idea, there's a good chance I'm going to take exactly this approach myself when I get around to cleaning up my computer setup.
 

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I can't honestly say one way or the other, since this conversation is the first I've ever heard of anyone trying it. (That means I also can't rightfully claim to be the first person to think of it because it seems so obvious that someone has to have beaten me to the punch somewhere...) Every monitor mounting arm I've seen is pretty beefy, even the cheap ones. I'd be surprised if vibration is an issue. But let's be pessimistic for a moment and assume that it will be. You could try any or all of the following to dampen them:

- Apply Mass-Loaded Vinyl or similar material to the surfaces of the arms to prevent them from ringing.
- Fabricate mounting plates for your speakers that accommodate some sort of isolation material (foam, rubber, etc).
- Clamp the mounting arm to a medium-hard rubber pad so that it is less-efficiently coupled to the desk.
- Drill a hole in a section of tube and fill it with expanding foam.
- Replace steel washers at joints with neoprene washers.
- Other idea I haven't had yet.

Something in there is probably going to work... especially the last one.

As for getting flat response out of the room, the usual approaches ought to serve you well. Diffusion, absorption, etc... I think the angled ceiling will actually end up working out in your favor since it creates a space in which it becomes difficult to set up a standing wave. Bryan? You're the man (now, dog) on this one...
 
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