AES London 2011
Monday, May 16, 11:00 — 13:30 (Room 4)
T13 - Hot and Nonlinear—Loudspeakers at High Amplitudes
Wolfgang Klippel, Klippel GmbH - Dresden Germany
Nonlinearities inherent in electro-dynamical transducer and the heating of the voice coil and magnetic system limit the acoustical output, generate distortion and other symptoms at high amplitudes. The large signal performance is the result of a deterministic process and predictable by lumped parameter models comprising nonlinear and thermal elements. The tutorial gives an introduction into the fundamentals, shows alternative measurement techniques and discusses the relationship between the physical causes and symptoms depending on the properties of the particular stimulus (test signal, music). Selection of meaningful measurements, the interpretation of the results and practical loudspeaker diagnostic is the main objective of the tutorial, which is important for designing small and light transducers producing the desired output at high efficiency and reasonable cost.