The equalization signal chain also supports dynamic equalization. Dynamic equalization is a feature where only large level signals are attenuated to prevent distortion but small signals are passed without any modification to the signal level. Most of the non-linear distortion in loudspeakers such as rub-and-buzz, sibilance noise and rocking modes are observed only at large signal levels. It is not necessary to apply any filtering at small signal levels. This increases the overall loudness of the audio signal while at the same time preventing audio artifacts. The equalization is applied at a particular frequency only if the signal level at that frequency exceeds a certain threshold. Once the dynamic equalizer is engaged, the signal is attenuated by the desired range so that the signal level is always maintained at the target threshold level. There are two dynamic equalizers available – each at a distinct programmable frequency point. Usually a low frequency dynamic equalizer is used to control rub-and-buzz distortion near the loudspeaker resonance region. A high frequency dynamic equalizer is used for rocking mode or sibilance control near the voicing region.

Figure 3-2 Dynamic Equalization Functionality

Figure 3-3 Dynamic Equalization Controls