Music includes three essential aspects: composition, interpretation, and listening. Listening to music is a complete aesthetic process and a highly subjective mental activity. Its value lies in giving people a sense of beauty. Although listening to music may have different feelings due to personal cultural qualities, artistic cultivation, and living environment, composers leave a lot of artistic gaps in their music works for conductors The artistic form of music, in which performers and even listeners fill in, understand, and generate creative impulses and emotional resonance, depends on the music itself and is a pursuit of people.

The sound emitted by an instrument is composed of fundamental frequency plus overtone, which is a musical term. It actually only occurs in some higher Octave band. In the waveform of different instrument sounds, different overtones in number and intensity form their own timbre characteristics. Most of the energy of various instruments is concentrated in the middle frequency. Only a few instruments can extend to both ends of the audible frequency. For example, the fundamental frequency of the Timpani is 45Hz. The Double bass and tuba are 40Hz, and the piano is 27Hz, The highest pitch of the clarinet is 15kHz, that of the violin and cello is 16kHz, and that of the flute is 17kHz. The piccolo and cymbal are 18kHz, while the piano and Oboe have a lot of overtones. However, there are no components above 20kHz, which makes people feel that the sound is not vivid enough. It can be seen that the requirements for sound equipment in truly high volume music playback are actually very high. Even sound systems with hundreds of thousands, or even millions, often cannot perform music well and engage in emotional communication. There is less realism in the presence. The main reason is that the system has poor overtone performance, insufficient bass diving, and insufficient treble extension. Generally speaking, it is not easy to play high notes well in sound systems, and it is even more difficult to play low notes well, So the sense of authenticity always feels inadequate

The highest frequency that can be directly heard by the human ear starting from 5kHz is 20kHz. However, the human brain still responds to higher frequency sound waves, with a maximum of 80kHz. Due to the large number of overtones in music and the small energy of the overtones, the propagation attenuation is large. If the high pitch of the speaker is not enough, it will greatly damage the reproduction of the music, but the high pitch performance of a regular speaker cannot be satisfactory. Therefore, in order to have the ability to replay ultra high notes. It is necessary to add ultra-high pitched speakers. Adding ultra-high pitched speakers plays an extremely important role in improving the quality of sound playback, especially in terms of expanding the sound field and exhibiting overtones. Even the roughness of the middle and low pitched sound can be improved, making the sound more vivid and enjoyable, and helping to enhance people's enjoyment in music. For horn speakers and coaxial speakers, Due to their narrow high-frequency radiation directionality, the addition of ultra-high pitched speakers has a more significant improvement in overall performance.

In order to maintain the basic sound quality of the original speaker without changing, the entry point frequency of ultra high pitched speakers is generally selected at 18kHz, 20kHz, or 22kHz. It should only be used as a supplement to the high pitched sound, and the overlap frequency with the original speaker should not be too much to disrupt the balance. The sensitivity adjustment of ultra high pitched speakers should not overly highlight their sound and dominate. It should feel the effect of ultra-high pitched sound, but the presence of ultra-high pitched speakers cannot be felt. That is to say, ultra high pitched speakers are not. Emphasizing "high pitched" but "extended" high pitched