Room for All

No. 6 is the width of the cup, its diameter on the inside of the rim. No. 7 is the outside diameter of the rim. The 8th critical measurement is diameter of the shank at the very bottom or end where the shank makes contact with the mouthpipe that is shown in part in Figure B [below] where the tubing inside the mouthpiece receiver pipe abuts, or should abut, the shank end of the mouthpiece.
The system consists of interchangeable “TOP” sections and “BACKBORE” sections.

french horn mouthpiece
custom mouthpiece

he wider or more open we make the shoulder of the throat, the mellower becomes the tone. In I the throat and cup shape combine into one long cup similar to that in a French horn mouthpiece, which, if used on the trumpet, is colorless. It is possible to achieve a judicious combination with the shallow cup which aids the lip and still avoid the stridency of tone usually produced by such a mouthpiece as F. This is done by opening the shoulder somewhat as shown in E, resulting in the double-cup originally designed by L. A. Schmidt of Cologne about seventy years ago for use in the low F, E, Eb, and D trumpets used by R. Strauss. These latter instruments incidentally but significantly, were played in the upper harmonics like a French horn. The double-cup mouthpiece makes for easier control in the difficult high passages.

As shown in the dimensions of mouthpieces by Rohner, the average throat diameter uses a 27 drill size. Small throats of 30 or even smaller and extremely large throats of 18 or 19 used by some players, but these extremes should be avoided by the average player.

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