MC,the general idea is to place the speakers so that the tweeters are about at your ear level. If for some reason they have to be higher or lower than that it's a good idea to tilt them slightly so that the tweeters still point at your ears. They're designed to be placed vertically, not horizontally, and have the best dispersion in that position. If you have to put them on a shelf, be sure to leave at least 3"-4" of space from the wall behind so that the port on the back has some room to "breathe".
