Fortschritte in der Entwicklung von Lautsprechern

Attemps to improve electrodynamic loudspeakers used for broadcasting lead to a membrane with quasi-parabolic trace. Damping applied to the edges smooths out the frequency responses and reduces the subharmonic content. The current in the coil reacts back on the magnetic field which produces non-linear distortion. The forces set up in the membrane can cause amplitude modulation.