A passive radiator includes a chassis (11) and a radiator body which is connected to the chassis and which is movable with respect to the chassis along a translation axis (T*). The radiator is capable of displacing comparatively large air volumes. The radiator body includes a central mass element (13a) and at least one mass element (13b) which is arranged concentrically with respect to the central mass element. The radiator further comprises connection units for movably interconnecting each pair of adjacent mass elements and for movably connecting one of the mass elements to an element (11a) of the chassis. Each of the connection units includes two resilient annular connecting rings (5a1, 5a2; 5b1, 5b2), which have two adjacent elements which are parts of said elements secured to them. The connecting rings of at least one of the connection units bound a closed chamber (17a) containing a gaseous medium in order to counteract undesired noises. The central mass element with its adjacent connection unit as well as each concentrically arranged mass element with its adjacent connecting limb forms a mass spring system, all the mass spring systems thus defined having, at least substantially, the same resonant frequency.