That depends on a number of things. I have a much larger open space than that and one pair of BS22LRs by themselves powered by a small amp reach decent levels without issue and I sit about 12 ft from them. In terms of specifications, look for something with slightly higher sensitivity, and it will also depend on how much power you will be feeding them. I do think you could get away with just bookshelf speakers, but at the price of P363s or FS52s, you are probably going to spend the same amount for BS22s or P153/163s and stands.