Patent ID: 6658129
Filing Date: 2003-12-02
Classification: H04R

Abstract:
A passive radiator comprising a chassis and a radiator body connected to said chassis, said radiator boding being movable with respect to said chassis along a translation axis, the radiator body comprising a central mass element and at least one further mass element arranged concentrically with respect to the central mass element, connection units being provided for movably interconnecting every two adjacent mass elements of the central mass element and the at least one further mass element, and for movably securing one of the mass elements to an element of the chassis, each of said connection units comprising two resilient annular connecting limbs secured to two adjacent mass elements of the central mass element and the at least one further mass element, the connecting limbs of at least one of the connection units bounding a closed chamber extending between the two adjacent mass elements secured to said units, said closed chamber being filled with a gaseous medium, the central mass element with the connection unit secured thereto, as well as each concentrically arranged further mass element with the connection unit secured thereto, forming a mass spring system, all of the mass spring systems having at least substantially the same resonant frequency.