Full frequency response

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If a sound is said to have Full Frequency Response, then the sound is composed of frequencies from across the entire audible spectrum. Human hearing is limited to sounds between approximately 20 Hz and 20 KHz, depending on age. While frequencies outside this range are generally not detectable by the human ear, they can still be perceived by other means. Very deep sounds below 20 Hz, for example, can be felt as vibrations if they are loud enough. So one might argue that, in order to possess full frequency response, a sound needs to encompass also those inaudible, yet perceptible frequencies.