The speaker system of the invention comprises a pair of inner and outer rightward loudspeakers and a pair of inner and outer leftward loudspeakers all of which are arranged such that their points of sound transmission are aligned on an equal vertical straight plane in front of a listener and the inner...http://www.google.com/patents/US4199658?utm_source=gb-gplus-sharePatent US4199658 - Binaural sound reproduction system
