What is the difference between bookshelf and floorstanding speakers. There are lots of very expensive bookshelf speakers... do they perform better than cheaper floorstands? I know it is usually the bass that is weak for bookshelf speakers but what if you have a sub? Will that make them comparable to floorstands? Can high end book shelf speakers from say focus or sonus fill in a big room as good as say hmm... paradigm 100s?