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Bach 15C vs Bach 18D

The Bach 15C has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material
The taper behind the throat leading to the shank. Affects projection and tone character.
Mouthpiece A
    Bach 15C
    • Baritone / Euphonium
    Backbore—
    Best suited for
    📣High-volume projection — open throat for power
    vs
    Mouthpiece B
      Bach 18D
      • Baritone / Euphonium
      Backbore—
      Best suited for
      📣High-volume projection — open throat for power

      Which is better?

      Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.

      Open in interactive tool + Add third mouthpiece Bach 15C details Bach 18D details Bach 15C equivalents Bach 18D equivalents

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