My Room is 13 x 19 I have had the confidence 20 speakers, and there was no need for a sub base. My room has a big picture window, hardwood floors with area rug. I also have some good room treatments. Very nice fast bold bass. Not sure what you have for an amp? I now have a set of confidence 30 Speakers, the base shakes my house. The difference between the 20 & the 30 speaker is huge. With the size of your room, you should buy a large floor stander.
