Klarinet Archive - Posting 000185.txt from 2002/03

From: "Dave Spiegelthal" <Spiegelthal.Dave@-----.COM>
Subj: [kl] Re: "Choking" the bore
Date: Tue, 12 Mar 2002 09:24:48 -0500

Bill Edinger wrote about the bore mismatch between the bodies and bells of two
of his clarinets, the mismatches being opposite (bell inner diameter smaller
than the lower joint ID on his Bb clarinet, and bell larger than the body on the
Eb clarinet). As I understand it, both approaches should have the same effect,
namely, to create an impedance mismatch at the bottom of the clarinet to promote
reflection of the pressure wave travelling down the instrument, which is what
creates the standing wave inside the tube that makes a steady pitch happen. I
apologize for this oversimplification (and even more so if I'm just plain
wrong!), but I'm not a physicist, nor do I play one on TV.............This is my
understanding of the situation from having read Benade's book and from my own
background as a mechanical engineer with some time in the field of underwater
acoustics (sonar).
David Spiegelthal
Calverton, VA
spiegelthal.dave@-----.com

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