Vibroacoustic therapy (VAT) is a type of relaxation method that uses low-frequency vibration waves. It is a combination of vibrations together with acoustic/sound accompaniment. The history of VAT was created on the basis of an experiment by the Norwegian doctor Skille, who implemented the idea of rehabilitative use of low-frequency sound through a vibroacoustic unit. It is a technology that was the first to mediate the induction of waves with a different frequency range. Important effects of VAT include: reduction of muscle tone, increase in range of motion, reduction of pain, reduction of stress, which is particularly relevant to this work, sensory stimulation in hearing impaired persons, etc. (Cramer, 2004). It is proven that the experiences of therapists clearly point to the fact that the application of VAT affects not only the perception of one's own body, but also the psyche of a person. VAT affects the parasympathetic nervous system, which can affect both psychological and physical symptoms. Physiological reactions occur during relaxation, which can be observed at the level of heart activity, respiration, secretion of internal glands and metabolism, motor reactions and perception. These physiological reactions are inherently associated with a state of physical and mental relaxation, they affect a person's psychological state, his emotional stability and lead mental processes towards the optimum. 

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The relationship between man and sound carries an inner connection that affects the development of the individual both physically and psychologically. Since ancient times, sound has been extremely important to humans and has become a crucial tool for survival. Over time, however, people recognize the meaning and depth of sound and incorporate it into their lives, transforming this phenomenon from natural noise into a sophisticated interpretation of their surroundings. The sonic representation of various aspects has been fundamental to the evolution of humanity. It is evident that it is now a part of language and communication, and its introduction has greatly contributed to the development of people and is considered one of the most important means. As mentioned above, sound as a method of survival has transformed to a much higher level. This level of development and sophistication has given humans a form of recognition, and it is this form that separates man from ordinary animals. Even though the main role of sound has changed over time, its meaning is etched in the minds of all individuals. The goal of every individual nowadays is to create such sounds that will be pleasant, pleasant, aesthetic, and the form of this "intelligence" will continue to be integrated into society. It is an ancient history between man and sound that contributes to why it plays such an important role. 

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The use of sound vibrations for health purposes first appeared almost simultaneously in the United States and Scandinavia between the 1970s and the late 1980s. The founder and pioneer of vibroacoustic therapy was the Norwegian educator and therapist Olav Skille, who developed the vibroacoustic chair in the early 1980s by using specific low frequencies for vibroacoustic stimulation. 

This is a type of instrument that has been classified as low frequency. Another personality who significantly participated in the vibroacoustic system was Petri Lehikoinen. Researcher and lecturer at the University of Helsinki. It was he who proposed the low-frequency SLF system called psychoacoustics. Psychoacoustics uses rhythmically pulsating low-frequency sound programmed by computer to resonate in certain areas of the body. The low frequency range bands were created based on clinical experience. According to these bands, the respective frequencies of specific health problems can be identified.