Patent ID: 7088836

Claim:
A door, comprising: a door frame; and a door leaf that swings on hinges in the door frame and receives an electrical input signal, the door leaf including front and rear cover panels with a first transducer device mounted therein, where the door leaf acts as a loudspeaker and includes a structural part that maintains fed-in vibrational energy and propagates this energy in at least one active surface perpendicular to its thickness to distribute resonance mode vibration components over at least one surface, which has a first location within it for the first transducer device, which is affixed on the structural part at the first location to set the structural part into vibration and to allow it to resonate, thus creating an acoustic radiator that delivers an acoustic output signal when it vibrates in resonance, the front and/or the rear cover panel of the door leaf being part of the stiff, light structural component, where the electrical input signal is conducted from the door frame to the door leaf over at least one hinge, and a second transducer is mounted in a second recess between the front and rear cover panels, where the second transducer is orientated to drive the rear parallel cover panel to resonance in order to deliver a rearward launched acoustic output wave, and the first and second transducers are separated by a flexible damping support element.