My room is 11x15 speakers are Canton 9k stand mounted and two SVS SB1000pro subs driven by Technics SUG 700 integrated. The Cantons sound very good by themselves with their approx.7 woofers", that is until I added the two subs.
The subs took the sound to another level, imagine, dynamics, soundstage, inner detail all improved by adding subs. I was not expecting this level of enhancement. Keep in mind you have a volume control, yea if I go nuts, I can shake the house, its a small cape cod after all. But woo the benefit of TWO subs in my room! I bet they will make significant improvement to your sound in your room, so at some point check out subs.