Abstract: A vehicle sound system is disclosed that includes a set of speakers, a head unit and a disc changer. In addition to a radio, the head unit also includes a means for playing music downloaded from a computer. In one embodiment, the music downloaded from the computer is stored in a compressed format on a removable hard disk drive. The music can be organized using play lists. Software is used to program the head unit to communicate with the disc changer. In one embodiment, the software is replaceable so that the head unit can communicate with different disc changers. The head unit also includes a control panel for operating the head unit and the disc changer.

Abstract: This invention regards an arrangement to correct the linear and nonlinear transfer behavior of electro-acoustical transducers, consisting of an electro-acoustical transducer, a distortion-reduction network connected to its input terminals, and a support system to fit the distortion-reduction network to the transducer. The distortion-reduction network shows nonlinear transfer characteristics obtained from modelling the transducer and thus changes the electrical signal such that the nonlinear effects of the network compensate for the nonlinear behavior of connected transducer. The result is an overall system with reduced distortion and improved linear transfer behavior. A fitting technique and system is used to change the parameters of the electrical network automatically to fit the actual transfer characteristics of the distortion reduction system to the transducer. Several mechanisms, unique to each transducer, are responsible for generation of nonlinear distortion.

Abstract: A speaker moounting assembly wherein the speaker is supported on a ceiling or wall construction. The baffle associated with the speaker includes a grille face exposed on the exterior of the ceiling or wall and an opposed interior face. Brackets are supported on the interior face, and frame clips are connected to the brackets. These clips include an inwardly extending portion which provides for the attachment of a hairpin spring. A ring is located in spaced relationship with the interior face of the baffle, and openings are defined by the ring for receiving each hairpin spring. In particular, the hairpin spring includes spring arms adapted to engage opposite side edges of the ring openings with the arms being urged apart for thereby urging the baffle toward the ring. The baffle is adapted to be pulled away from the ring in opposition to the action of the spring arms for permitting access to the speaker.