The human voice is a complex instrument. The sound of the voice is composed of several components. Some may be generated in the lungs and chest cavity, others a result of the resonance of the larynx, or something that occur higher up in the anatomy such as lips and tongue.
Esses can be generated by a human voice when the tongue is placed on the upper palate, directly behind the top teeth. Different voices have different tendencies, and combining a vocalist who generates an abundance of high frequencies with a microphone that was designed with an emphasis on capturing these same frequencies can result in a displeasing sound.
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