ABSTRACT
Along with built-in power ampliers, active loudspeakers use analog or digital signal processing to modify the transfer function properties, shape optimized crossover lters, prevent overheating, etc. The signal processing system may be located at some distance or be installed in the loudspeaker. Analog processing is not only limited to improvement of transfer function behavior and reduction of nonlinear transduction, it can also be used for active impedance modication of driver parameters, a possibility unique to analog techniques. Digital signal processing on the other hand can be used to equalize the loudspeaker and room transfer functions and to limit overheating based on models of the thermal properties of the drive mechanism, etc.
