My Reed Won't Stay Closed.
Good thing too right? Here's a question for the Wizards. When the energy wave arrives back at the mouthpiece, after making 2 windsprints the length of the sounding tube, it is a rarefaction and causes the reed to close, With the reed now closed, the tube is a resonating chamber. THe wave heads down the tube again on it's 3rd lap, still a rarefaction, but when it arrives at what the acoustical system "sees" as the body tube entrance, or the point of truncation, the difference in acoustical impedance causes a partial reflection of the wave, which goes back to the mouthpiece as a pressure wave and causes the reed to open. So, the amount of time the reed is closed during each cycle is determined by the resonance freuency of the cone's truncation. Some people say that the mouthpiece is the truncation while others (Benade) claim that the mouthpiece + neck are the truncation. My question is: What does the acoustical system "see" as the truncation, or, where is this point where the change in acoustical impedance causes the partial pressure wave reflection which opens the reed?
Depending upon the answers, the next question may be about the significance of the 10M neck bend.
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