Abstract: A loudspeaker has a focused magnetic field and a specialized voice-coil structure, which provides constant inductance at the voice coil over the entire extent of voice coil excursion. The magnetic field is focused to a thin disc and the winding of the voice coil is of a height so that it is always in view of the thin disc of the magnetic field. The voice coil winding is not more than two layers. An extended base cross-section center pole is employed having an undercut portion forming a crown at the top. The edges of the crown are chamfered to cooperate with chamfered edges on a top plate to form the thin disc of the focused magnetic field.

Abstract: A loudspeaker enclosure is shaped as a truncated pyramid with all vertical edges being smoothly rounded. A high-frequency speaker is mounted in an individual spherical shell and affixed to the top of the truncated pyramid. Other speakers are mounted inside the enclosure, and the portion of enclosure adjacent the speaker in a horizontal plane is kept to a minimum to reduce standing waves. An individual sound chamber is provided for each speaker mounted inside the enclosure. The speakers are also mounted with vibration isolation mounts which vibrationally decouple the speakers from the enclosure.