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| Number | Title | Issue Date |
| 7284638 | Loudspeaker low profile quarter wavelength transmission line and enclosure and method A speaker enclosure including a compact quarter wavelength transmission path in the shape of a closed spiral that expands radially outward from a centrally located loudspeaker mounting location. The height of the transmission path has a minimum height that is equal ... | 10/23/2007 |
| 7051835 | Bass-reflex loudspeaker system and method of manufacturing the same The loudspeaker construction comprises a loudspeaker chamber delimited by a loudspeaker enclosure structure, a reflex duct communicating with the loudspeaker chamber so as to connect the loudspeaker chamber to the exterior environment of the loudspeaker enclosure, a... | 05/30/2006 |
| 6973994 | Apparatus for increasing the quality of sound from an acoustic source An apparatus for increasing the quality of sound from an acoustic source comprises in one embodiment a hollow enclosure, an acoustic source, an acoustic guide, a pair of acoustic inlet openings, a pair of acoustic exit openings, and pair of acoustic paths, wherein t... | 12/13/2005 |
| 6648098 | Spiral acoustic waveguide electroacoustical transducing system The invention features an acoustic waveguide and system for transmitting pressure wave energy produced by an electroacoustical transducer in a medium that propagates pressure wave energy. The acoustic waveguide and system includes a tube defining a spiral... | 11/18/2003 |
| 6356643 | Electro-acoustic transducer An electro-acoustic transducer, such as a speaker device or an earphone device. Includes an electro-acoustic transducing unit, such as a speaker unit, for converting input electrical signals into sound, a casing in which the electro-acoustic transducing u... | 03/12/2002 |
| 4689609 | Electronic horn with spiral deflecting walls coupled to a truncated cone structure An electronic horn of compact dimensions. Oscillator circuits coupled to a mixing node produce a multiple frequency signal used to drive a horn transducer. One horn replaces the two horns used in the prior art. A reverberating chamber in close proximity t... | 08/25/1987 |
| 4206831 | Loudspeaker coupler An electrically driven loudspeaker is coupled to the atmosphere, which is to carry sound to the human ear, through a hollow coupler the inlet end of which has a cross sectional area comparable to the effective area of the loudspeaker, said cross sectional... | 06/10/1980 |
