You could try decoupling them from the floor with something like Nobsound springs. This will clean up the bass and open up the sound for a more spacious soundstage and focused imaging. Putting them directly on the floor accentuates the bass effect but can also muddy it by vibrating the floor. If you feel they sound better with the springs but lacking the previously colored bass, you might add a small sub or two like the REL T5x.
bookshelf speakers on the floor
I spend a lot of the time on the floor (bad back) and read, listen, waste all the good remaining hours of the day like a lazy cat. I tried a pair of speakers on the floor, - before moving to a stand - and noticed that they sounded better than on a stand - to my ears. When I am on the floor, they sound even better. (Yes, there are a number of things wrong with me)
Is it OK for a bookshelf speaker to be on the floor? And if so, should I put something underneath? (Should I try putting it on my stomach? Just kidding!)