Acoustic apparatus with secondary quarterwave resonator
Patent 5313525 Issued on May 17, 1994. Estimated Expiration Date: 
April 2, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 2, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2815087 Loudspeaker system Multiple porting loudspeaker systems High output loudspeaker for low frequency reproduction Acoustic apparatus Acoustic apparatus with plural resonators having different resonance frequencies Multiple chamber loudspeaker system Bass reflex type speaker system Patent #: 5150417 InventorAssigneeApplicationNo. 861935 filed on 04/02/1992US Classes:381/350, Front wave181/156Reflex baffleExaminersPrimary: Kuntz, CurtisAssistant: Le, Huyen Attorney, Agent or FirmForeign Patent References
International ClassH04R 025/00AbstractA loudspeaker system for use as a subwoofer or other bass speaker system utilizes an enclosure with at least one speaker mounted therein and a port to form a bass reflex system. The bass reflex system is tuned to a selected low frequency range so that the acoustical output within such low range of the frequency spectrum of the loudspeaker system is enhanced while minimizing speaker cone excursion and distortion. Whereas the bass reflex speaker system loads the speaker at the selected low frequency range, a waveguide in the form of a quarterwave resonator is included in the loudspeaker system for loading the speaker at a higher frequency range which is still within the frequency range of the speaker system, so that acoustical output is enhanced and speaker cone excursion and distortion are minimized at the upper end of the frequency range. The resonator is designed to function as a quarterwave resonator within the upper frequency range. The resonator may comprise a tube or duct, located within the speaker enclosure together with one or more speakers. The tube or duct extends from the speakers to an opening in the front of the enclosure. The volume within the enclosure and outside of the tube or duct combines with the speaker and a port in the enclosure to form the bass reflex portion of the system.Other References
Field of SearchReflecting elementDetail of mechanical vibration coupling to transducer (e.g., tuned vibrating element) By modifying fluid flow Loudspeakers driven in given phase relationship PLURAL DIAPHRAGM SOUND SOURCES Plural chambers DIAPHRAGM AND ENCLOSURE Recessed (e.g., wall-mounted, etc.) With horn Reflector baffle Reflex baffle | |
