What's a "large" room


I'll be doing my basement this winter. I plan on starting with speakers and matching components to them. My question is this, sometimes when I look at speakers they say "good for a large room". My room will be 15x21 with an additional 7x5 area for a small bar. The ceiling will vary 7-8 foot. Where will my new "lounge" fall in?
sprink
Generally it seems to be about 20 x 25 or larger, from my take on things, it is definitely bigger than a mid-size room and much larger than a small one.
The Focal website lists room volumes for each speaker. Maybe similar information is available for other brands?