The stimulator is a harmonic generator, which uses the psychoacoustic characteristics of people to modify and beautify the sound signal. By adding high-frequency harmonic components to the sound and other methods, the sound quality, timbre, penetration and sense of space can be improved. Modern exciters can not only create high-frequency harmonics, but also have functions such as low-frequency expansion and music style, making bass effect more perfect and music more expressive.

Use the exciter to improve the clarity, intelligibility and expressiveness of the voice. Make the sound more pleasant, reduce listening fatigue, and increase loudness. Although the exciter only adds about 0.5dB of harmonic components to the sound, it actually sounds like the volume has increased by about 10dB. The auditory loudness of sound, the stereoscopic sense of sound image, and the separation of sound are obviously increased; It improves the sound positioning and sense of hierarchy, as well as the sound quality of the playback sound and the tape replication rate. Because the acoustic signal will lose high-frequency harmonic components during transmission and recording, high-frequency noise will appear. At this time, the former uses the exciter to compensate the signal first, and the latter uses the filter to filter out the high-frequency noise, and then creates the high tone component to ensure the playback sound quality. The adjustment of the exciter requires the sound engineer to judge the sound quality and timbre of the system, and then adjust according to the subjective listening evaluation.