Dynamic sound transducers, handset and headsets set

Dynamic sound transducers with a membrane system comprising (a, 110 b 110a) comprises a diaphragm (110) having a first and second bead, and a voice coil (120) which in the region between the first and second beads (110a, 110b) is arranged, wherein the membrane system has a hole (150) in the center of the membrane system, wherein the membrane system is arranged in a chassis (130) and the first and second bead (110a, 110b) are fixed inside and outside the chassis (130) wherein the membrane (110) in the region between the first and second beads (110a, 110b) is configured stiffer than in the region of an inner and outer membrane base (112, 111).