Does using these make much of a difference in sound? Right now I am using bookshelfs as my fronts and rears. I have them sitting on top of boxes and shelfs. It looks kind of crapy and I am contemplating buying some stands but I want to know if it is worth it. I also don't know what height of stand to buy. My fronts bookshelfs are about 11 inches high and my rears about 8 inches high.