The Cup: Depth

In general, a large cup diameter and/or depth lowers the pitch of an instrument, while a small cup diameter and/or shallow cup raises the pitch. Therefore, it is important to match the cup of the mouthpiece with the pitch of the instrument. Due to variations in embouchure, air support and oral cavity among musicians, individuals should select a cup which improves their overall intonation. The correct depth of the cup depends upon the pitch and corresponding length of the instrument, and, to a certain extent, the bore. For example, achieving the  brilliance of a B piccolo trumpet requires a shallow cup, while the dark lyrical tone quality of a fluegelhorn demands the use of a deep cup. For this reason, we do not recommend using refitted trumpet or cornet mouthpieces with the fluegelhorn.  A player using a medium-large bore B or C trumpet or a B cornet should generally use a mouthpiece no shallower thanthe Bach C cup and preferably, slightly deeper cups such as a B or A. One exception is for musicians who continually play in the extreme high register and desire a brighter sound. In this case, a more shallow mouthpiece such as a 3D, 3E, 3F or 5SV may be preferable. For the Horn, a comparatively large volume of air must be used to fill the bell. A very deep cup will help to get a full low register (suitable for second and fourth horn) while a shallower cup will help produce high tones (advantageous for first and third horn players). For the small tenor trombone, a medium-deep mouthpiece cup such as the 7C, 11C  or 12C is preferred. For the symphonic tenor trombone, a larger cup, such as 6 1⁄2AM, 6 1⁄2AL, 5G, 5GB, or 5GS may be preferable. For baritone or euphonium, it is generally best to use a medium-deep cup, preferably one with a symphonic backbore to produce a more mellow tone.