Perception of The Armonica Sound
The somewhat disorienting quality of the ethereal sound is due in part to the way that humans perceive and locate ranges of sounds. Above 4,000 Hertz we primarily use the volume of the sound to differentiate between each ear (left and right) and thus triangulate, or locate, the source. Below 1,000 Hertz we use the 'phase differences' of sound waves arriving at our ears to identify left and right for location. The predominant timbre of the armonica is in the range of 1,000–4,000 hertz, which coincides with the sound range where the brain is 'not quite sure' and thus we have difficulty locating it in space (where it comes from), and referencing the source of the sound (the materials and techniques used to produce it).
Benjamin Franklin himself described the armonica's tones as "incomparably sweet". The full quotation, written in a letter to Giambattista Beccaria, an Italian priest and electrician, is "The advantages of this instrument are that its tones are incomparably sweet beyond those of any other; that they may be swelled and softened at pleasure by stronger or weaker pressures of the finger, and continued to any length; and that the instrument, once well tuned, never again wants tuning."
Read more about this topic: Glass Harmonica
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