No. You cannot use curtain to adjust room size. Room size affect bass more than anything else. Curtains absorb higher frequencies but otherwise they are bass transparent.
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Sidssp is right. However, you can use the curtain to change certain aspects, but for bass modes you have to consider solid walls that re-enforce bass. If you go to our website for Rives Audio and click on the listening room there is a tutorial on listening room anamolies including modes amoung other things. There are also a variety of good references such as Alton Everest's books that can be very helpful in designing a listening room. We of course design listening rooms as a business and would certainly want you to look at the services we offer, but even if you don't use us, please look at the free resources on our website.
Why are you doing this? If it's because you're only going to use part of a room for your system, and NOT an important aestheic requirement (spousal acceptance factor? Ha!), then why not set up your system and start fine-tuning speaker position? In other words such a nearfield geometry in a larger space can afford GREAT benefits in sounstage depth and freedom from secondary reflections. Yes, you MAY require additional bottom octave support if the room is TOO large. I use an 8' equilateral triangle in a 14x24x8 room VERY successfully. My "stage" is at least 20' deep sometimes! Good luck, and sorry if I'm off the mark re your needs. ern