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.

Abstract: An electro-acoustic transducer assembly includes a permanent magnet and a diaphragm having a voice coil bonded thereto. The assembly comprises a hollow casing having an opening formed in one surface thereof; a closure for covering the opening and comprising an aperture therein in which the diaphragm is mounted, and a cover mounted on one side of the closure for protecting the diaphragm, wherein the magnet is positioned on the opposite side of the closure in proximity to the voice coil on the diaphragm. The assembly also includes a latching assembly for releasably securing the closure across the opening in the casing in a latched position with the cover being positioned to the exterior of the assembly and the magnet being positioned in the casing, the latching assembly being operable by application of pressure at preselected locations on the periphery of said casing to release the closure from the latched position.