I downsized to a similar sized room, and there was no way my four-piece full-range system could fit in the room. I'm very happy with Nola Micro Grands now, they work very well in my 15x12 room. I agree with Onhwy61 and Xti16, though, try the various Acoustats first in your new room to see if they can work. Also, experiment with long and short wall placement for the speakers, if possible.
What to do?
I have had the luxury of living with a large dedicated listening room for the last 20+ years. I have Acoustat speakers (2+2's, 3's, 4's, and 1+1's) driven by Sanders Magteck power amp. My wife and I have decided to "downsize" and my new room size is 15' X 12' a far cry from 20' X 24'. Realizing I need to sell the Sanders amp and the all the Acoustat's my question is what will work in a 15' X 12' room? Thanks in advance........Bob