The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 1998
Filed:
Jan. 02, 1996
Robert W Carver, Snohomish, WA (US);
Other;
Abstract
A subwoofer including a walled cabinet defining an enclosed space of less than 1 cubic foot; axial openings formed in two opposed cabinet walls; and, two driver assemblies mounted within the cabinet on a common axis with the wall openings. Each driver assembly includes: a base; a magnetic pole coaxial with the common axis; an annular magnet surrounding the pole and defining therewith an annular magnetic gap therebetween; a frame coaxial with the common axis and secured at one end to the magnet with its opposite end lying in a plane proximate to the plane of the opening in the adjacent cabinet wall; a cylindrical voice coil former mounted within the magnetic gap and axially moveable relative thereto; a pair of separate voice coils wound about the former with freedom for axial movement within the magnetic gap; a cone having its large diameter end lying in a plane containing the free end of the frame and an apical end coupled to one end of the former; and, a resilient suspension for coupling the cone and former to the frame with freedom for axial movement through a peak-to-peak stroke of approximately 2.5'. Positive and negative signal amplifiers having inputs and outputs are provided with their outputs coupled to respective different ones of the voice coils. An audio signal processor including a power supply is coupled to the inputs of the amplifiers for alternately energizing the voice coils during positive and negative voltage swings of the audio signal.