Abstract: A dynamic loudspeaker which operates over a wide band of audio frequencies is disclosed. The speaker includes a speaker cone and voice coil structure of very low mass. A configuration of ribs on the cone and dust cap is important to both high and low frequency performance. The rear suspension for the speaker is a bearing on the voice coil structure. The bearing encircles and slides on the magnetic center pole of the speaker. A method of fabricating the low mass coil structure is disclosed, including forming the bearing surface by heat shrinkage of a low friction tape.

Abstract: A dynamic loudspeaker which operates over a wide band of audio frequencies is disclosed. The speaker includes a speaker cone and voice coil structure of very low mass. A configuration of ribs on the cone and dust cap is important to both high and low frequency performance. The rear suspension for the speaker is a bearing on the voice coil structure. The bearing encircles and slides on the magnetic center pole of the speaker. A method of fabricating the low mass coil structure is disclosed, including forming the bearing surface by heat shrinkage of a low friction tape.

Abstract: A loudspeaker is constructed by circumferentially bonding a magnetic assembly in coaxial alignment rearward within a frame and installing an acoustic radiator assembly at a forward end of the frame, the acoustic radiator assembly having a cylindrical member about which a voice coil is wound, the cylindrical member extending rearward into an annular flux gap in the magnetic assembly such that the voice coil is disposed in proper alignment within the annular flux gap by virtue of the cylindrical member bearing against a mating surface of the magnetic assembly, thereby bringing the acoustic radiator assembly into substantially coaxial alignment with respect to the frame to facilitate suspension thereof at the forward end of the frame.

Abstract: A dynamic loudspeaker which operates over a wide band of audio frequencies is disclosed. The speaker includes a speaker cone and voice coil structure of very low mass. A configuration of ribs on the cone and dust cap is important to both high and low frequency performance. The rear suspension for the speaker is a bearing on the voice coil structure. The bearing encircles and slides on the magnetic center pole of the speaker. A method of fabricating the low mass coil structure is disclosed, including forming the bearing surface by heat shrinkage of a low friction tape.

Abstract: A speaker assembly for mounting in an oval acoustic baffle opening such as the rear deck of an automobile comprises an oval unitary tuned port and frame for a moving voice coil loudspeaker.

Abstract: A dynamic loudspeaker which operates over a wide band of audio frequencies is disclosed. The speaker includes a speaker cone and voice coil structure of very low mass. A configuration of ribs on the cone and dust cap is important to both high and low frequency performance. The rear suspension for the speaker is a bearing on the voice coil structure. The bearing encircles and slides on the magnetic center pole of the speaker. A method of fabricating the low mass coil structure is disclosed, including forming the bearing surface by heat shrinkage of a low friction tape.

Abstract: A very small audio speaker is described which has a broad-band electrical-mechanical transducer, a broad-band mechanical-air-transducer, and a special suspension system which combine to produce a substantially flat frequency response over substantially the entire audio range from about 50 Hz to about 18,000 Hz.The broad-band electrical-mechanical transducer has either a voice coil with two axially spaced subsections, or a magnetic field with two axially spaced subsections, with the other being continuous between two effective boundaries. Each subsection of the coil, for example, is generally centered on the boundary of the magnetic flux field so that as one subsection moves into the flux field, the other subsection moves out of the flux field at the same rate, thus maintaining a linear force as the coil reciprocates through a much longer distance than is possible using conventional continuous coil and magnetic structures.

Abstract: A sealed speaker enclosure formed from a loud speaker and five square shaped walls. Each wall forming the enclosure is constructed from a thin sheet of acoustically transmitting material and a plurality of perpendicularly intersecting ribs. These intersecting ribs are attached together at their intersections to form a rigid interconnecting rib structure. The rib structure extends across and is attached to one side of the sheet so that the ribs extend transverse to one side of the sheet. The walls are attached together at their edges to form a five sided enclosure. The rib structures of adjacent walls are in contact and attached together to add rigidity to the walls. The loud speaker is attached to the walls to form a sixth side of the enclosure.