Patent ID: 7983436

Claim:
An apparatus for reducing baffle vibration in a vehicle, the apparatus comprising: a) a baffle that is subject to vibration; b) a first transducer that is seated in the baffle, the first transducer comprising a first diaphragm having a first surface that is acoustically coupled to a listening area in the vehicle and a second surface that is acoustically coupled to a cavity in the vehicle, the first transducer configured to react to a first input signal applied to the first transducer by causing the first diaphragm to move in a first direction, thereby generating an acoustic output; and c) a second transducer that is mechanically coupled to the first transducer, the second transducer comprising a second diaphragm having a first surface that is acoustically coupled to the second surface of the first diaphragm and to the cavity, and a second surface that is acoustically coupled to the listening area, the second transducer configured to react to a second input signal applied to the second transducer by causing the second diaphragm to move in a second direction, the movement of the second diaphragm reducing a vibration imparted to the baffle from the movement of the first diaphragm while substantially maintaining the acoustic output when the second direction is substantially opposite to the first direction.