How should I position my speakers?

Generally, bookshelf and floor-standing speakers should be placed with some distance from the back and side walls. Ideally, the listener should also be seated with some distance from the rear wall. Precise spatial imaging is achieved when you position your speakers in the famous "stereo triangle." The listener sits at the apex of an equilateral triangle. Placement recommendations can also be found in your speaker's user manual. Our speakers are all tuned to an ear height (when seated) of about 110cm. How else could a customer manage to have the tweeter at ear height with different floor-standing speakers or with bookshelf speakers on the same stands?