I have heard the Audio Physic Step and thought that it was a great sounding small speaker. It is limited by the fact that the woofer is very small and can handle only so much power before bottoming out. If you do not listen to loud music it may be an excellent choice. If you do listen to loud music the ProAc Response speakers are great musical speakers. You may be able to fit the 1.5 in that space. They are expensive, but they would enable you to have full range sound in your narrow room.
