Patent ID: 6980664

Claim:
A loudspeaker including an moving coil and a membrane fastened to a chassis, wherein the membrane is divided into a concentrically disposed inner membrane part and a concentrically disposed outer membrane part, whereby a meeting area is defined between the inner membrane part and the outer membrane part, the inner membrane part being fastened to an inner moving coil and the outer membrane part being fastened to an outer moving coil; wherein the meeting area is held fast to the chassis or magnet, and wherein the loudspeaker includes a magnet system including an annular magnet that defines an inner magnet edge and an outer magnet edge with a front annular pole disc and a back pole member in the form of a ring bowl defining an inner air gap along the inner magnet edge between the pole disc and the ring bowl and an outer air gap along the outer magnet edge between the pole disc and the ring bowl.