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- Blow resistance is the acoustical resistance created by the
mouthpiece when playing the instrument.
- Such resistance depends on the specific
design of the cylindrical bore and the backbore.
- The blow resistance number
that we use is a ratio, which is a multiple of the trumpet bore velocity head.
- The mouthpiece blow resistance affects the acoustical impedance of the
resonating air column.
- We use this when analyzing mouthpieces and matching the
player to the mouthpiece.
- The bore size alone doesn't provide enough information to
accurately make a match of the mouthpiece, horn, and player.
- Blow resistance is
a function of diameter and length.
- We also calculate the volume of each
- This includes the cup, bore and backbore.