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Generally, a bell (widening of the bore of a tube to a flared ending) serves the purpose of an acoustical impedance match. The impedance that vibrations in the instrument face is quite different than the impedance of the open air, and the gradually enlarging bell couples the vibrations out of the tube into the air.

In the case of woodwinds which have bells, the effect is considerably lessened, because the sound from these instruments leave the bore through the fingerholes as well as the bell, but generally speaking, the bell affects all of the tones which leave the instrument, reinforcing and making them louder.

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