Assertion: marimba's bar | /r/AtLocation | tune
Facets:
value: with each other
type: OTHER
value: properly
type: MANNER
Source sentences:
text: When the bar and resonator are properly in tune with each other, the vibrating air beneath the bar travels down the resonator and is reflected from the closure at the bottom, then returns to the top and is reflected back by the bar, over and over, creating a much stronger standing wave and increasing the amplitude of the fundamental frequency.