Assertion: percussion instrument's pitch | /r/AtLocation | the range of 1–4 khz
Facets:
Source sentences:
text: The predominant pitch of the armonica is in the range of 1–4 kHz, which coincides with the sound range where the brain is "not quite sure", and thus listeners have difficulty locating it in space (where it comes from), and discerning the source of the sound (the materials and techniques used to produce it).