Abstract: A sound reproduction system has audio drivers for producing audio outputs in response to a left channel signal and a right channel signal and for producing an expanded acoustic image. The sound reproduction system comprises a left audio driver for radiating left total audio information corresponding to the left channel signal along a left acoustic axis and a right audio driver for radiating right total audio information corresponding to the right channel signal along a right acoustic axis. An image expansion arrangement is provided for radiating ambience audio information corresponding to predetermined combinations of the left channel signal and the right channel signal along the same left acoustic axis and right acoustic axis as the left total audio information and the right total audio information.

Abstract: Sound reproduction apparatus includes a loudspeaker system having a plurality of drivers for producing audio signals in response to respective electrical right and left stereophonic signals. A first of these drivers has a voice coil wired and connected in circuit for producing an audio output signal representing one of the electrical right and left stereophonic signals. A second of these drivers has a dual voice coil wired and connected in circuit for producing an audio output signal representing a difference between the one of the electrical right and left stereophonic signals reproduced by the first driver and the other stereophonic signal.

Abstract: Sound reproduction apparatus comprising a pair of loudspeaker systems each including a plurality of loudspeakers for producing audio signals in response to respective electrical right (R) and left (L) stereophonic signals. Each system is mounted in an enclosure with sides and a gabled or V-shaped front portion characterized in having a pair of flat, vertical panels each joined to respective ones of the sides, the panels being joined at an intersecting angle to one another of about 90 to about 120 degrees at a forwardly projecting vertical ridge. Each system has a tweeter, woofer and mid-range speaker all connected for monophonically reproducing only a respective one of the stereophonic signals, and positioned in first ones of its panels. Each system also includes at least a second mid-range speaker connected for reproducing only a difference output between the stereophonic signals by using a dual voice coil driver, the second mid-range speaker being positioned in the other of its panels.